56ffbf7e70
sense and preprocessored otherwise; unify the logic saves 144t 1i and lots of cpp(1) time, as well as improves readability
1398 lines
29 KiB
C
1398 lines
29 KiB
C
/* $OpenBSD: history.c,v 1.35 2006/05/29 18:22:24 otto Exp $ */
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/* $OpenBSD: trap.c,v 1.22 2005/03/30 17:16:37 deraadt Exp $ */
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/histrap.c,v 1.33 2006/11/10 07:52:02 tg Exp $");
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#ifndef mksh_siglist
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#if defined(BSD) || defined(__APPLE__)
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#define mksh_signame(x) sys_signame[(x)]
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#define mksh_siglist(x) sys_siglist[(x)]
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#elif defined(__INTERIX)
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#define mksh_signame(x) _sys_signame[(x)]
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#define mksh_siglist(x) _sys_siglist[(x)]
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#elif defined(__gnu_linux__) || defined(__sun__) || defined(__CYGWIN__)
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#define NEED_MKSH_SIGNAME /* sync the list above with Build.sh */
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#define mksh_siglist(x) strsignal(x)
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#else
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# error "Define sys_sig{name,list} for this platform!"
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#endif
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#endif /* ndef mksh_siglist */
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Trap sigtraps[NSIG + 1];
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static struct sigaction Sigact_ign, Sigact_trap;
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#ifdef V_HISTFILE
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static int hist_count_lines(unsigned char *, int);
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static int hist_shrink(unsigned char *, int);
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static unsigned char *hist_skip_back(unsigned char *,int *,int);
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static void histload(Source *, unsigned char *, int);
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static void histinsert(Source *, int, unsigned char *);
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static void writehistfile(int, char *);
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static int sprinkle(int);
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#endif
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static int hist_execute(char *);
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static int hist_replace(char **, const char *, const char *, int);
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static char **hist_get(const char *, int, int);
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static char **hist_get_oldest(void);
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static void histbackup(void);
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static char **current; /* current position in history[] */
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static int hstarted; /* set after hist_init() called */
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static Source *hist_source;
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#ifdef V_HISTFILE
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static char *hname; /* current name of history file */
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static int histfd;
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static int hsize;
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#endif
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int
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c_fc(char **wp)
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{
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struct shf *shf;
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struct temp *tf = NULL;
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char *p, *editor = NULL;
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int gflag = 0, lflag = 0, nflag = 0, sflag = 0, rflag = 0;
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int optc;
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char *first = NULL, *last = NULL;
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char **hfirst, **hlast, **hp;
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if (!Flag(FTALKING_I)) {
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bi_errorf("history functions not available");
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return 1;
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}
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while ((optc = ksh_getopt(wp, &builtin_opt,
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"e:glnrs0,1,2,3,4,5,6,7,8,9,")) != -1)
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switch (optc) {
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case 'e':
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p = builtin_opt.optarg;
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if (strcmp(p, "-") == 0)
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sflag++;
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else {
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size_t len = strlen(p);
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editor = str_nsave(p, len + 4, ATEMP);
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memcpy(editor + len, " $_", 4);
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}
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break;
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case 'g': /* non-at&t ksh */
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gflag++;
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break;
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case 'l':
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lflag++;
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break;
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case 'n':
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nflag++;
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break;
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case 'r':
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rflag++;
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break;
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case 's': /* posix version of -e - */
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sflag++;
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break;
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/* kludge city - accept -num as -- -num (kind of) */
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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p = shf_smprintf("-%c%s",
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optc, builtin_opt.optarg);
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if (!first)
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first = p;
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else if (!last)
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last = p;
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else {
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bi_errorf("too many arguments");
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return 1;
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}
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break;
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case '?':
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return 1;
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}
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wp += builtin_opt.optind;
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/* Substitute and execute command */
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if (sflag) {
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char *pat = NULL, *rep = NULL;
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if (editor || lflag || nflag || rflag) {
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bi_errorf("can't use -e, -l, -n, -r with -s (-e -)");
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return 1;
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}
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/* Check for pattern replacement argument */
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if (*wp && **wp && (p = strchr(*wp + 1, '='))) {
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pat = str_save(*wp, ATEMP);
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p = pat + (p - *wp);
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*p++ = '\0';
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rep = p;
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wp++;
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}
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/* Check for search prefix */
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if (!first && (first = *wp))
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wp++;
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if (last || *wp) {
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bi_errorf("too many arguments");
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return 1;
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}
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hp = first ? hist_get(first, false, false) :
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hist_get_newest(false);
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if (!hp)
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return 1;
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return hist_replace(hp, pat, rep, gflag);
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}
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if (editor && (lflag || nflag)) {
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bi_errorf("can't use -l, -n with -e");
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return 1;
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}
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if (!first && (first = *wp))
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wp++;
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if (!last && (last = *wp))
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wp++;
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if (*wp) {
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bi_errorf("too many arguments");
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return 1;
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}
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if (!first) {
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hfirst = lflag ? hist_get("-16", true, true) :
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hist_get_newest(false);
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if (!hfirst)
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return 1;
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/* can't fail if hfirst didn't fail */
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hlast = hist_get_newest(false);
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} else {
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/* POSIX says not an error if first/last out of bounds
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* when range is specified; at&t ksh and pdksh allow out of
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* bounds for -l as well.
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*/
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hfirst = hist_get(first, (lflag || last) ? true : false,
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lflag ? true : false);
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if (!hfirst)
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return 1;
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hlast = last ? hist_get(last, true, lflag ? true : false) :
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(lflag ? hist_get_newest(false) : hfirst);
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if (!hlast)
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return 1;
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}
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if (hfirst > hlast) {
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char **temp;
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temp = hfirst; hfirst = hlast; hlast = temp;
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rflag = !rflag; /* POSIX */
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}
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/* List history */
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if (lflag) {
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char *s, *t;
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const char *nfmt = nflag ? "\t" : "%d\t";
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for (hp = rflag ? hlast : hfirst;
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hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1) {
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shf_fprintf(shl_stdout, nfmt,
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hist_source->line - (int) (histptr - hp));
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/* print multi-line commands correctly */
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for (s = *hp; (t = strchr(s, '\n')); s = t)
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shf_fprintf(shl_stdout, "%.*s\t",
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(int)(++t - s), s);
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shf_fprintf(shl_stdout, "%s\n", s);
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}
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shf_flush(shl_stdout);
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return 0;
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}
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/* Run editor on selected lines, then run resulting commands */
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tf = maketemp(ATEMP, TT_HIST_EDIT, &e->temps);
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if (!(shf = tf->shf)) {
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bi_errorf("cannot create temp file %s - %s",
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tf->name, strerror(errno));
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return 1;
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}
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for (hp = rflag ? hlast : hfirst;
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hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1)
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shf_fprintf(shf, "%s\n", *hp);
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if (shf_close(shf) == EOF) {
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bi_errorf("error writing temporary file - %s", strerror(errno));
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return 1;
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}
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/* Ignore setstr errors here (arbitrary) */
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setstr(local("_", false), tf->name, KSH_RETURN_ERROR);
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/* XXX: source should not get trashed by this.. */
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{
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Source *sold = source;
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int ret;
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ret = command(editor ? editor : "${FCEDIT:-/bin/ed} $_");
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source = sold;
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if (ret)
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return ret;
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}
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{
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struct stat statb;
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XString xs;
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char *xp;
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int n;
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if (!(shf = shf_open(tf->name, O_RDONLY, 0, 0))) {
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bi_errorf("cannot open temp file %s", tf->name);
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return 1;
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}
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n = stat(tf->name, &statb) < 0 ? 128 : statb.st_size + 1;
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Xinit(xs, xp, n, hist_source->areap);
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while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) {
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xp += n;
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if (Xnleft(xs, xp) <= 0)
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XcheckN(xs, xp, Xlength(xs, xp));
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}
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if (n < 0) {
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bi_errorf("error reading temp file %s - %s",
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tf->name, strerror(shf_errno(shf)));
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shf_close(shf);
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return 1;
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}
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shf_close(shf);
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*xp = '\0';
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strip_nuls(Xstring(xs, xp), Xlength(xs, xp));
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return hist_execute(Xstring(xs, xp));
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}
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}
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/* Save cmd in history, execute cmd (cmd gets trashed) */
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static int
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hist_execute(char *cmd)
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{
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Source *sold;
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int ret;
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char *p, *q;
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histbackup();
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for (p = cmd; p; p = q) {
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if ((q = strchr(p, '\n'))) {
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*q++ = '\0'; /* kill the newline */
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if (!*q) /* ignore trailing newline */
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q = NULL;
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}
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histsave(++(hist_source->line), p, 1);
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shellf("%s\n", p); /* POSIX doesn't say this is done... */
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if ((p = q)) /* restore \n (trailing \n not restored) */
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q[-1] = '\n';
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}
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/* Commands are executed here instead of pushing them onto the
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* input 'cause posix says the redirection and variable assignments
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* in
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* X=y fc -e - 42 2> /dev/null
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* are to effect the repeated commands environment.
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*/
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/* XXX: source should not get trashed by this.. */
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sold = source;
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ret = command(cmd);
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source = sold;
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return ret;
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}
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static int
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hist_replace(char **hp, const char *pat, const char *rep, int globr)
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{
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char *line;
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if (!pat)
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line = str_save(*hp, ATEMP);
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else {
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char *s, *s1;
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int pat_len = strlen(pat);
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int rep_len = strlen(rep);
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int len;
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XString xs;
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char *xp;
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int any_subst = 0;
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Xinit(xs, xp, 128, ATEMP);
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for (s = *hp; (s1 = strstr(s, pat)) && (!any_subst || globr);
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s = s1 + pat_len) {
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any_subst = 1;
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len = s1 - s;
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XcheckN(xs, xp, len + rep_len);
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memcpy(xp, s, len); /* first part */
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xp += len;
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memcpy(xp, rep, rep_len); /* replacement */
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xp += rep_len;
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}
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if (!any_subst) {
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bi_errorf("substitution failed");
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return 1;
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}
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len = strlen(s) + 1;
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XcheckN(xs, xp, len);
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memcpy(xp, s, len);
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xp += len;
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line = Xclose(xs, xp);
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}
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return hist_execute(line);
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}
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/*
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* get pointer to history given pattern
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* pattern is a number or string
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*/
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static char **
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hist_get(const char *str, int approx, int allow_cur)
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{
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char **hp = NULL;
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int n;
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if (getn(str, &n)) {
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hp = histptr + (n < 0 ? n : (n - hist_source->line));
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if (hp < history) {
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if (approx)
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hp = hist_get_oldest();
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else {
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bi_errorf("%s: not in history", str);
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hp = NULL;
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}
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} else if (hp > histptr) {
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if (approx)
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hp = hist_get_newest(allow_cur);
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else {
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bi_errorf("%s: not in history", str);
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hp = NULL;
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}
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} else if (!allow_cur && hp == histptr) {
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bi_errorf("%s: invalid range", str);
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hp = NULL;
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}
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} else {
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int anchored = *str == '?' ? (++str, 0) : 1;
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/* the -1 is to avoid the current fc command */
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n = findhist(histptr - history - 1, 0, str, anchored);
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if (n < 0) {
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bi_errorf("%s: not in history", str);
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hp = NULL;
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} else
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hp = &history[n];
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}
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return hp;
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}
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/* Return a pointer to the newest command in the history */
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char **
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hist_get_newest(int allow_cur)
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{
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if (histptr < history || (!allow_cur && histptr == history)) {
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bi_errorf("no history (yet)");
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return NULL;
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}
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if (allow_cur)
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return histptr;
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return histptr - 1;
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}
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/* Return a pointer to the newest command in the history */
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static char **
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hist_get_oldest(void)
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{
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if (histptr <= history) {
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bi_errorf("no history (yet)");
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return NULL;
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}
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return history;
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}
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/******************************/
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/* Back up over last histsave */
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/******************************/
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static void
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histbackup(void)
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{
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static int last_line = -1;
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if (histptr >= history && last_line != hist_source->line) {
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hist_source->line--;
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afree((void*)*histptr, APERM);
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histptr--;
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last_line = hist_source->line;
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}
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}
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/*
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* Return the current position.
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*/
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char **
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histpos(void)
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{
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return current;
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}
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int
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histnum(int n)
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{
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int last = histptr - history;
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if (n < 0 || n >= last) {
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current = histptr;
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return last;
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} else {
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current = &history[n];
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return n;
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}
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}
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/*
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* This will become unnecessary if hist_get is modified to allow
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* searching from positions other than the end, and in either
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* direction.
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*/
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int
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findhist(int start, int fwd, const char *str, int anchored)
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{
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char **hp;
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int maxhist = histptr - history;
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int incr = fwd ? 1 : -1;
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int len = strlen(str);
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if (start < 0 || start >= maxhist)
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start = maxhist;
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hp = &history[start];
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for (; hp >= history && hp <= histptr; hp += incr)
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if ((anchored && strncmp(*hp, str, len) == 0) ||
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(!anchored && strstr(*hp, str)))
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return hp - history;
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return -1;
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}
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int
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findhistrel(const char *str)
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{
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int maxhist = histptr - history;
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int start = maxhist - 1;
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int rec;
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getn(str, &rec);
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if (rec == 0)
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return -1;
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if (rec > 0) {
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if (rec > maxhist)
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return -1;
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return rec - 1;
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}
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if (rec > maxhist)
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return -1;
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return start + rec + 1;
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}
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/*
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* set history
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* this means reallocating the dataspace
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*/
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void
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sethistsize(int n)
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{
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if (n > 0 && n != histsize) {
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int cursize = histptr - history;
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/* save most recent history */
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if (n < cursize) {
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memmove(history, histptr - n, n * sizeof(char *));
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cursize = n;
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}
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history = (char **)aresize(history, n*sizeof(char *), APERM);
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histsize = n;
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histptr = history + cursize;
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}
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}
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#ifdef V_HISTFILE
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/*
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* set history file
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* This can mean reloading/resetting/starting history file
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* maintenance
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*/
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void
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sethistfile(const char *name)
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{
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/* if not started then nothing to do */
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if (hstarted == 0)
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return;
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/* if the name is the same as the name we have */
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if (hname && strcmp(hname, name) == 0)
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return;
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/*
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* its a new name - possibly
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*/
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if (histfd) {
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/* yes the file is open */
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(void) close(histfd);
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histfd = 0;
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hsize = 0;
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afree(hname, APERM);
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hname = NULL;
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/* let's reset the history */
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histptr = history - 1;
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hist_source->line = 0;
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}
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|
|
|
hist_init(hist_source);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* initialise the history vector
|
|
*/
|
|
void
|
|
init_histvec(void)
|
|
{
|
|
if (history == (char **)NULL) {
|
|
histsize = HISTORYSIZE;
|
|
history = (char **)alloc(histsize*sizeof (char *), APERM);
|
|
histptr = history - 1;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Routines added by Peter Collinson BSDI(Europe)/Hillside Systems to
|
|
* a) permit HISTSIZE to control number of lines of history stored
|
|
* b) maintain a physical history file
|
|
*
|
|
* It turns out that there is a lot of ghastly hackery here
|
|
*/
|
|
|
|
|
|
/*
|
|
* save command in history
|
|
*/
|
|
void
|
|
histsave(int lno __attribute__((unused)), const char *cmd,
|
|
int dowrite __attribute__((unused)))
|
|
{
|
|
char **hp;
|
|
char *c, *cp;
|
|
|
|
c = str_save(cmd, APERM);
|
|
if ((cp = strchr(c, '\n')) != NULL)
|
|
*cp = '\0';
|
|
|
|
#ifdef V_HISTFILE
|
|
if (histfd && dowrite)
|
|
writehistfile(lno, c);
|
|
#endif
|
|
|
|
hp = histptr;
|
|
|
|
if (++hp >= history + histsize) { /* remove oldest command */
|
|
afree((void*)*history, APERM);
|
|
for (hp = history; hp < history + histsize - 1; hp++)
|
|
hp[0] = hp[1];
|
|
}
|
|
*hp = c;
|
|
histptr = hp;
|
|
}
|
|
|
|
/*
|
|
* Write history data to a file nominated by HISTFILE
|
|
* if HISTFILE is unset then history still happens, but
|
|
* the data is not written to a file
|
|
* All copies of ksh looking at the file will maintain the
|
|
* same history. This is ksh behaviour.
|
|
*
|
|
* This stuff uses mmap()
|
|
* if your system ain't got it - then you'll have to undef HISTORYFILE
|
|
*/
|
|
|
|
/*
|
|
* Open a history file
|
|
* Format is:
|
|
* Bytes 1, 2: HMAGIC - just to check that we are dealing with
|
|
* the correct object
|
|
* Then follows a number of stored commands
|
|
* Each command is
|
|
* <command byte><command number(4 bytes)><bytes><null>
|
|
*/
|
|
#define HMAGIC1 0xab
|
|
#define HMAGIC2 0xcd
|
|
#define COMMAND 0xff
|
|
|
|
void
|
|
hist_init(Source *s)
|
|
{
|
|
#ifdef V_HISTFILE
|
|
unsigned char *base;
|
|
int lines;
|
|
int fd;
|
|
#endif
|
|
|
|
if (Flag(FTALKING) == 0)
|
|
return;
|
|
|
|
hstarted = 1;
|
|
|
|
hist_source = s;
|
|
|
|
#ifdef V_HISTFILE
|
|
hname = str_val(global("HISTFILE"));
|
|
if (hname == NULL)
|
|
return;
|
|
hname = str_save(hname, APERM);
|
|
|
|
retry:
|
|
/* we have a file and are interactive */
|
|
if ((fd = open(hname, O_RDWR|O_CREAT|O_APPEND, 0600)) < 0)
|
|
return;
|
|
|
|
histfd = savefd(fd);
|
|
if (histfd != fd)
|
|
close(fd);
|
|
|
|
(void) flock(histfd, LOCK_EX);
|
|
|
|
hsize = lseek(histfd, 0L, SEEK_END);
|
|
|
|
if (hsize == 0) {
|
|
/* add magic */
|
|
if (sprinkle(histfd)) {
|
|
hist_finish();
|
|
return;
|
|
}
|
|
} else if (hsize > 0) {
|
|
/*
|
|
* we have some data
|
|
*/
|
|
base = (unsigned char *)mmap(0, hsize, PROT_READ,
|
|
MAP_FILE|MAP_PRIVATE, histfd, 0);
|
|
/*
|
|
* check on its validity
|
|
*/
|
|
if (base == MAP_FAILED || *base != HMAGIC1 || base[1] != HMAGIC2) {
|
|
if (base != MAP_FAILED)
|
|
munmap((caddr_t)base, hsize);
|
|
hist_finish();
|
|
unlink(hname);
|
|
goto retry;
|
|
}
|
|
if (hsize > 2) {
|
|
lines = hist_count_lines(base+2, hsize-2);
|
|
if (lines > histsize) {
|
|
/* we need to make the file smaller */
|
|
if (hist_shrink(base, hsize))
|
|
unlink(hname);
|
|
munmap((caddr_t)base, hsize);
|
|
hist_finish();
|
|
goto retry;
|
|
}
|
|
}
|
|
histload(hist_source, base+2, hsize-2);
|
|
munmap((caddr_t)base, hsize);
|
|
}
|
|
(void) flock(histfd, LOCK_UN);
|
|
hsize = lseek(histfd, 0L, SEEK_END);
|
|
#endif
|
|
}
|
|
|
|
#ifdef V_HISTFILE
|
|
typedef enum state {
|
|
shdr, /* expecting a header */
|
|
sline, /* looking for a null byte to end the line */
|
|
sn1, /* bytes 1 to 4 of a line no */
|
|
sn2, sn3, sn4
|
|
} State;
|
|
|
|
static int
|
|
hist_count_lines(unsigned char *base, int bytes)
|
|
{
|
|
State state = shdr;
|
|
int lines = 0;
|
|
|
|
while (bytes--) {
|
|
switch (state) {
|
|
case shdr:
|
|
if (*base == COMMAND)
|
|
state = sn1;
|
|
break;
|
|
case sn1:
|
|
state = sn2; break;
|
|
case sn2:
|
|
state = sn3; break;
|
|
case sn3:
|
|
state = sn4; break;
|
|
case sn4:
|
|
state = sline; break;
|
|
case sline:
|
|
if (*base == '\0')
|
|
lines++, state = shdr;
|
|
}
|
|
base++;
|
|
}
|
|
return lines;
|
|
}
|
|
|
|
/*
|
|
* Shrink the history file to histsize lines
|
|
*/
|
|
static int
|
|
hist_shrink(unsigned char *oldbase, int oldbytes)
|
|
{
|
|
int fd;
|
|
char nfile[PATH_MAX];
|
|
struct stat statb;
|
|
unsigned char *nbase = oldbase;
|
|
int nbytes = oldbytes;
|
|
|
|
nbase = hist_skip_back(nbase, &nbytes, histsize);
|
|
if (nbase == NULL)
|
|
return 1;
|
|
if (nbase == oldbase)
|
|
return 0;
|
|
|
|
/*
|
|
* create temp file
|
|
*/
|
|
(void) shf_snprintf(nfile, sizeof(nfile), "%s.%d", hname, procpid);
|
|
if ((fd = open(nfile, O_CREAT | O_TRUNC | O_WRONLY, 0600)) < 0)
|
|
return 1;
|
|
if (fstat(histfd, &statb) >= 0)
|
|
chown(nfile, statb.st_uid, statb.st_gid);
|
|
|
|
if (sprinkle(fd)) {
|
|
close(fd);
|
|
unlink(nfile);
|
|
return 1;
|
|
}
|
|
if (write(fd, nbase, nbytes) != nbytes) {
|
|
close(fd);
|
|
unlink(nfile);
|
|
return 1;
|
|
}
|
|
close(fd);
|
|
|
|
/*
|
|
* rename
|
|
*/
|
|
if (rename(nfile, hname) < 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* find a pointer to the data 'no' back from the end of the file
|
|
* return the pointer and the number of bytes left
|
|
*/
|
|
static unsigned char *
|
|
hist_skip_back(unsigned char *base, int *bytes, int no)
|
|
{
|
|
int lines = 0;
|
|
unsigned char *ep;
|
|
|
|
for (ep = base + *bytes; --ep > base; ) {
|
|
/* this doesn't really work: the 4 byte line number that is
|
|
* encoded after the COMMAND byte can itself contain the
|
|
* COMMAND byte....
|
|
*/
|
|
for (; ep > base && *ep != COMMAND; ep--)
|
|
;
|
|
if (ep == base)
|
|
break;
|
|
if (++lines == no) {
|
|
*bytes = *bytes - ((char *)ep - (char *)base);
|
|
return ep;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* load the history structure from the stored data
|
|
*/
|
|
static void
|
|
histload(Source *s, unsigned char *base, int bytes)
|
|
{
|
|
State state;
|
|
int lno = 0;
|
|
unsigned char *line = NULL;
|
|
|
|
for (state = shdr; bytes-- > 0; base++) {
|
|
switch (state) {
|
|
case shdr:
|
|
if (*base == COMMAND)
|
|
state = sn1;
|
|
break;
|
|
case sn1:
|
|
lno = (((*base)&0xff)<<24);
|
|
state = sn2;
|
|
break;
|
|
case sn2:
|
|
lno |= (((*base)&0xff)<<16);
|
|
state = sn3;
|
|
break;
|
|
case sn3:
|
|
lno |= (((*base)&0xff)<<8);
|
|
state = sn4;
|
|
break;
|
|
case sn4:
|
|
lno |= (*base)&0xff;
|
|
line = base+1;
|
|
state = sline;
|
|
break;
|
|
case sline:
|
|
if (*base == '\0') {
|
|
/* worry about line numbers */
|
|
if (histptr >= history && lno-1 != s->line) {
|
|
/* a replacement ? */
|
|
histinsert(s, lno, line);
|
|
} else {
|
|
s->line = lno;
|
|
histsave(lno, (char *)line, 0);
|
|
}
|
|
state = shdr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Insert a line into the history at a specified number
|
|
*/
|
|
static void
|
|
histinsert(Source *s, int lno, unsigned char *line)
|
|
{
|
|
char **hp;
|
|
|
|
if (lno >= s->line-(histptr-history) && lno <= s->line) {
|
|
hp = &histptr[lno-s->line];
|
|
if (*hp)
|
|
afree((void*)*hp, APERM);
|
|
*hp = str_save((char *)line, APERM);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* write a command to the end of the history file
|
|
* This *MAY* seem easy but it's also necessary to check
|
|
* that the history file has not changed in size.
|
|
* If it has - then some other shell has written to it
|
|
* and we should read those commands to update our history
|
|
*/
|
|
static void
|
|
writehistfile(int lno, char *cmd)
|
|
{
|
|
int sizenow;
|
|
unsigned char *base;
|
|
unsigned char *new;
|
|
int bytes;
|
|
unsigned char hdr[5];
|
|
|
|
(void) flock(histfd, LOCK_EX);
|
|
sizenow = lseek(histfd, 0L, SEEK_END);
|
|
if (sizenow != hsize) {
|
|
/*
|
|
* Things have changed
|
|
*/
|
|
if (sizenow > hsize) {
|
|
/* someone has added some lines */
|
|
bytes = sizenow - hsize;
|
|
base = (unsigned char *)mmap(0, sizenow,
|
|
PROT_READ, MAP_FILE|MAP_PRIVATE, histfd, 0);
|
|
if (base == MAP_FAILED)
|
|
goto bad;
|
|
new = base + hsize;
|
|
if (*new != COMMAND) {
|
|
munmap((caddr_t)base, sizenow);
|
|
goto bad;
|
|
}
|
|
hist_source->line--;
|
|
histload(hist_source, new, bytes);
|
|
hist_source->line++;
|
|
lno = hist_source->line;
|
|
munmap((caddr_t)base, sizenow);
|
|
hsize = sizenow;
|
|
} else {
|
|
/* it has shrunk */
|
|
/* but to what? */
|
|
/* we'll give up for now */
|
|
goto bad;
|
|
}
|
|
}
|
|
/*
|
|
* we can write our bit now
|
|
*/
|
|
hdr[0] = COMMAND;
|
|
hdr[1] = (lno>>24)&0xff;
|
|
hdr[2] = (lno>>16)&0xff;
|
|
hdr[3] = (lno>>8)&0xff;
|
|
hdr[4] = lno&0xff;
|
|
(void) write(histfd, hdr, 5);
|
|
(void) write(histfd, cmd, strlen(cmd)+1);
|
|
hsize = lseek(histfd, 0L, SEEK_END);
|
|
(void) flock(histfd, LOCK_UN);
|
|
return;
|
|
bad:
|
|
hist_finish();
|
|
}
|
|
|
|
void
|
|
hist_finish(void)
|
|
{
|
|
(void) flock(histfd, LOCK_UN);
|
|
(void) close(histfd);
|
|
histfd = 0;
|
|
}
|
|
|
|
/*
|
|
* add magic to the history file
|
|
*/
|
|
static int
|
|
sprinkle(int fd)
|
|
{
|
|
static unsigned char mag[] = { HMAGIC1, HMAGIC2 };
|
|
|
|
return(write(fd, mag, 2) != 2);
|
|
}
|
|
#endif
|
|
|
|
#ifdef NEED_MKSH_SIGNAME
|
|
static const char *
|
|
mksh_signame(int s)
|
|
{
|
|
int i = 0;
|
|
static const struct _mksh_sigpair {
|
|
int nr;
|
|
const char *name;
|
|
} mksh_sigpair[] = {
|
|
#include "signames.inc"
|
|
{ 0, NULL }
|
|
};
|
|
|
|
mksh_sigscan:
|
|
if ((mksh_sigpair[i].nr == s) || !mksh_sigpair[i].name)
|
|
return (mksh_sigpair[i].name);
|
|
++i;
|
|
goto mksh_sigscan;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
inittraps(void)
|
|
{
|
|
int i;
|
|
|
|
/* Populate sigtraps based on sys_signame and sys_siglist. */
|
|
for (i = 0; i <= NSIG; i++) {
|
|
sigtraps[i].signal = i;
|
|
if (i == SIGERR_) {
|
|
sigtraps[i].name = "ERR";
|
|
sigtraps[i].mess = "Error handler";
|
|
} else {
|
|
sigtraps[i].name = mksh_signame(i);
|
|
sigtraps[i].mess = mksh_siglist(i);
|
|
}
|
|
}
|
|
sigtraps[SIGEXIT_].name = "EXIT"; /* our name for signal 0 */
|
|
|
|
sigemptyset(&Sigact_ign.sa_mask);
|
|
Sigact_ign.sa_flags = 0; /* interruptible */
|
|
Sigact_ign.sa_handler = SIG_IGN;
|
|
Sigact_trap = Sigact_ign;
|
|
Sigact_trap.sa_handler = trapsig;
|
|
|
|
sigtraps[SIGINT].flags |= TF_DFL_INTR | TF_TTY_INTR;
|
|
sigtraps[SIGQUIT].flags |= TF_DFL_INTR | TF_TTY_INTR;
|
|
sigtraps[SIGTERM].flags |= TF_DFL_INTR;/* not fatal for interactive */
|
|
sigtraps[SIGHUP].flags |= TF_FATAL;
|
|
sigtraps[SIGCHLD].flags |= TF_SHELL_USES;
|
|
|
|
/* these are always caught so we can clean up any temporary files. */
|
|
setsig(&sigtraps[SIGINT], trapsig, SS_RESTORE_ORIG);
|
|
setsig(&sigtraps[SIGQUIT], trapsig, SS_RESTORE_ORIG);
|
|
setsig(&sigtraps[SIGTERM], trapsig, SS_RESTORE_ORIG);
|
|
setsig(&sigtraps[SIGHUP], trapsig, SS_RESTORE_ORIG);
|
|
}
|
|
|
|
static void alarm_catcher(int sig);
|
|
|
|
void
|
|
alarm_init(void)
|
|
{
|
|
sigtraps[SIGALRM].flags |= TF_SHELL_USES;
|
|
setsig(&sigtraps[SIGALRM], alarm_catcher,
|
|
SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
alarm_catcher(int sig __attribute__((unused)))
|
|
{
|
|
int errno_ = errno;
|
|
|
|
if (ksh_tmout_state == TMOUT_READING) {
|
|
int left = alarm(0);
|
|
|
|
if (left == 0) {
|
|
ksh_tmout_state = TMOUT_LEAVING;
|
|
intrsig = 1;
|
|
} else
|
|
alarm(left);
|
|
}
|
|
errno = errno_;
|
|
}
|
|
|
|
Trap *
|
|
gettrap(const char *name, int igncase)
|
|
{
|
|
int i;
|
|
Trap *p;
|
|
|
|
if (ksh_isdigit(*name)) {
|
|
int n;
|
|
|
|
if (getn(name, &n) && 0 <= n && n < NSIG)
|
|
return &sigtraps[n];
|
|
return NULL;
|
|
}
|
|
for (p = sigtraps, i = NSIG+1; --i >= 0; p++)
|
|
if (p->name) {
|
|
if (igncase) {
|
|
if (p->name && (!strcasecmp(p->name, name) ||
|
|
(strlen(name) > 3 &&
|
|
(p->name[0] == 's' || p->name[0] == 'S') &&
|
|
(p->name[1] == 'i' || p->name[1] == 'I') &&
|
|
(p->name[2] == 'g' || p->name[2] == 'G') &&
|
|
!strcasecmp(p->name, name + 3))))
|
|
return p;
|
|
} else {
|
|
if (p->name && (!strcmp(p->name, name) ||
|
|
(strlen(name) > 3 && !strncmp("SIG",
|
|
p->name, 3) && !strcmp(p->name, name + 3))))
|
|
return p;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* trap signal handler
|
|
*/
|
|
void
|
|
trapsig(int i)
|
|
{
|
|
Trap *p = &sigtraps[i];
|
|
int errno_ = errno;
|
|
|
|
trap = p->set = 1;
|
|
if (p->flags & TF_DFL_INTR)
|
|
intrsig = 1;
|
|
if ((p->flags & TF_FATAL) && !p->trap) {
|
|
fatal_trap = 1;
|
|
intrsig = 1;
|
|
}
|
|
if (p->shtrap)
|
|
(*p->shtrap)(i);
|
|
errno = errno_;
|
|
}
|
|
|
|
/* called when we want to allow the user to ^C out of something - won't
|
|
* work if user has trapped SIGINT.
|
|
*/
|
|
void
|
|
intrcheck(void)
|
|
{
|
|
if (intrsig)
|
|
runtraps(TF_DFL_INTR|TF_FATAL);
|
|
}
|
|
|
|
/* called after EINTR to check if a signal with normally causes process
|
|
* termination has been received.
|
|
*/
|
|
int
|
|
fatal_trap_check(void)
|
|
{
|
|
int i;
|
|
Trap *p;
|
|
|
|
/* todo: should check if signal is fatal, not the TF_DFL_INTR flag */
|
|
for (p = sigtraps, i = NSIG+1; --i >= 0; p++)
|
|
if (p->set && (p->flags & (TF_DFL_INTR|TF_FATAL)))
|
|
/* return value is used as an exit code */
|
|
return 128 + p->signal;
|
|
return 0;
|
|
}
|
|
|
|
/* Returns the signal number of any pending traps: ie, a signal which has
|
|
* occurred for which a trap has been set or for which the TF_DFL_INTR flag
|
|
* is set.
|
|
*/
|
|
int
|
|
trap_pending(void)
|
|
{
|
|
int i;
|
|
Trap *p;
|
|
|
|
for (p = sigtraps, i = NSIG+1; --i >= 0; p++)
|
|
if (p->set && ((p->trap && p->trap[0]) ||
|
|
((p->flags & (TF_DFL_INTR|TF_FATAL)) && !p->trap)))
|
|
return p->signal;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* run any pending traps. If intr is set, only run traps that
|
|
* can interrupt commands.
|
|
*/
|
|
void
|
|
runtraps(int flag)
|
|
{
|
|
int i;
|
|
Trap *p;
|
|
|
|
if (ksh_tmout_state == TMOUT_LEAVING) {
|
|
ksh_tmout_state = TMOUT_EXECUTING;
|
|
warningf(false, "timed out waiting for input");
|
|
unwind(LEXIT);
|
|
} else
|
|
/* XXX: this means the alarm will have no effect if a trap
|
|
* is caught after the alarm() was started...not good.
|
|
*/
|
|
ksh_tmout_state = TMOUT_EXECUTING;
|
|
if (!flag)
|
|
trap = 0;
|
|
if (flag & TF_DFL_INTR)
|
|
intrsig = 0;
|
|
if (flag & TF_FATAL)
|
|
fatal_trap = 0;
|
|
for (p = sigtraps, i = NSIG+1; --i >= 0; p++)
|
|
if (p->set && (!flag ||
|
|
((p->flags & flag) && p->trap == NULL)))
|
|
runtrap(p);
|
|
}
|
|
|
|
void
|
|
runtrap(Trap *p)
|
|
{
|
|
int i = p->signal;
|
|
char *trapstr = p->trap;
|
|
int oexstat;
|
|
int old_changed = 0;
|
|
|
|
p->set = 0;
|
|
if (trapstr == NULL) { /* SIG_DFL */
|
|
if (p->flags & TF_FATAL) {
|
|
/* eg, SIGHUP */
|
|
exstat = 128 + i;
|
|
unwind(LLEAVE);
|
|
}
|
|
if (p->flags & TF_DFL_INTR) {
|
|
/* eg, SIGINT, SIGQUIT, SIGTERM, etc. */
|
|
exstat = 128 + i;
|
|
unwind(LINTR);
|
|
}
|
|
return;
|
|
}
|
|
if (trapstr[0] == '\0') /* SIG_IGN */
|
|
return;
|
|
if (i == SIGEXIT_ || i == SIGERR_) { /* avoid recursion on these */
|
|
old_changed = p->flags & TF_CHANGED;
|
|
p->flags &= ~TF_CHANGED;
|
|
p->trap = NULL;
|
|
}
|
|
oexstat = exstat;
|
|
/* Note: trapstr is fully parsed before anything is executed, thus
|
|
* no problem with afree(p->trap) in settrap() while still in use.
|
|
*/
|
|
command(trapstr);
|
|
exstat = oexstat;
|
|
if (i == SIGEXIT_ || i == SIGERR_) {
|
|
if (p->flags & TF_CHANGED)
|
|
/* don't clear TF_CHANGED */
|
|
afree(trapstr, APERM);
|
|
else
|
|
p->trap = trapstr;
|
|
p->flags |= old_changed;
|
|
}
|
|
}
|
|
|
|
/* clear pending traps and reset user's trap handlers; used after fork(2) */
|
|
void
|
|
cleartraps(void)
|
|
{
|
|
int i;
|
|
Trap *p;
|
|
|
|
trap = 0;
|
|
intrsig = 0;
|
|
fatal_trap = 0;
|
|
for (i = NSIG+1, p = sigtraps; --i >= 0; p++) {
|
|
p->set = 0;
|
|
if ((p->flags & TF_USER_SET) && (p->trap && p->trap[0]))
|
|
settrap(p, NULL);
|
|
}
|
|
}
|
|
|
|
/* restore signals just before an exec(2) */
|
|
void
|
|
restoresigs(void)
|
|
{
|
|
int i;
|
|
Trap *p;
|
|
|
|
for (i = NSIG+1, p = sigtraps; --i >= 0; p++)
|
|
if (p->flags & (TF_EXEC_IGN|TF_EXEC_DFL))
|
|
setsig(p, (p->flags & TF_EXEC_IGN) ? SIG_IGN : SIG_DFL,
|
|
SS_RESTORE_CURR|SS_FORCE);
|
|
}
|
|
|
|
void
|
|
settrap(Trap *p, char *s)
|
|
{
|
|
sig_t f;
|
|
|
|
if (p->trap)
|
|
afree(p->trap, APERM);
|
|
p->trap = str_save(s, APERM); /* handles s == 0 */
|
|
p->flags |= TF_CHANGED;
|
|
f = !s ? SIG_DFL : s[0] ? trapsig : SIG_IGN;
|
|
|
|
p->flags |= TF_USER_SET;
|
|
if ((p->flags & (TF_DFL_INTR|TF_FATAL)) && f == SIG_DFL)
|
|
f = trapsig;
|
|
else if (p->flags & TF_SHELL_USES) {
|
|
if (!(p->flags & TF_ORIG_IGN) || Flag(FTALKING)) {
|
|
/* do what user wants at exec time */
|
|
p->flags &= ~(TF_EXEC_IGN|TF_EXEC_DFL);
|
|
if (f == SIG_IGN)
|
|
p->flags |= TF_EXEC_IGN;
|
|
else
|
|
p->flags |= TF_EXEC_DFL;
|
|
}
|
|
|
|
/* assumes handler already set to what shell wants it
|
|
* (normally trapsig, but could be j_sigchld() or SIG_IGN)
|
|
*/
|
|
return;
|
|
}
|
|
|
|
/* todo: should we let user know signal is ignored? how? */
|
|
setsig(p, f, SS_RESTORE_CURR|SS_USER);
|
|
}
|
|
|
|
/* Called by c_print() when writing to a co-process to ensure SIGPIPE won't
|
|
* kill shell (unless user catches it and exits)
|
|
*/
|
|
int
|
|
block_pipe(void)
|
|
{
|
|
int restore_dfl = 0;
|
|
Trap *p = &sigtraps[SIGPIPE];
|
|
|
|
if (!(p->flags & (TF_ORIG_IGN|TF_ORIG_DFL))) {
|
|
setsig(p, SIG_IGN, SS_RESTORE_CURR);
|
|
if (p->flags & TF_ORIG_DFL)
|
|
restore_dfl = 1;
|
|
} else if (p->cursig == SIG_DFL) {
|
|
setsig(p, SIG_IGN, SS_RESTORE_CURR);
|
|
restore_dfl = 1; /* restore to SIG_DFL */
|
|
}
|
|
return restore_dfl;
|
|
}
|
|
|
|
/* Called by c_print() to undo whatever block_pipe() did */
|
|
void
|
|
restore_pipe(int restore_dfl)
|
|
{
|
|
if (restore_dfl)
|
|
setsig(&sigtraps[SIGPIPE], SIG_DFL, SS_RESTORE_CURR);
|
|
}
|
|
|
|
/* Set action for a signal. Action may not be set if original
|
|
* action was SIG_IGN, depending on the value of flags and FTALKING.
|
|
*/
|
|
int
|
|
setsig(Trap *p, sig_t f, int flags)
|
|
{
|
|
struct sigaction sigact;
|
|
|
|
if (p->signal == SIGEXIT_ || p->signal == SIGERR_)
|
|
return 1;
|
|
|
|
/* First time setting this signal? If so, get and note the current
|
|
* setting.
|
|
*/
|
|
if (!(p->flags & (TF_ORIG_IGN|TF_ORIG_DFL))) {
|
|
sigaction(p->signal, &Sigact_ign, &sigact);
|
|
p->flags |= sigact.sa_handler == SIG_IGN ?
|
|
TF_ORIG_IGN : TF_ORIG_DFL;
|
|
p->cursig = SIG_IGN;
|
|
}
|
|
|
|
/* Generally, an ignored signal stays ignored, except if
|
|
* - the user of an interactive shell wants to change it
|
|
* - the shell wants for force a change
|
|
*/
|
|
if ((p->flags & TF_ORIG_IGN) && !(flags & SS_FORCE) &&
|
|
(!(flags & SS_USER) || !Flag(FTALKING)))
|
|
return 0;
|
|
|
|
setexecsig(p, flags & SS_RESTORE_MASK);
|
|
|
|
/* This is here 'cause there should be a way of clearing shtraps, but
|
|
* don't know if this is a sane way of doing it. At the moment,
|
|
* all users of shtrap are lifetime users (SIGCHLD, SIGALRM, SIGWINCH).
|
|
*/
|
|
if (!(flags & SS_USER))
|
|
p->shtrap = NULL;
|
|
if (flags & SS_SHTRAP) {
|
|
p->shtrap = f;
|
|
f = trapsig;
|
|
}
|
|
|
|
if (p->cursig != f) {
|
|
p->cursig = f;
|
|
sigemptyset(&sigact.sa_mask);
|
|
sigact.sa_flags = 0 /* interruptible */;
|
|
sigact.sa_handler = f;
|
|
sigaction(p->signal, &sigact, NULL);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* control what signal is set to before an exec() */
|
|
void
|
|
setexecsig(Trap *p, int restore)
|
|
{
|
|
/* XXX debugging */
|
|
if (!(p->flags & (TF_ORIG_IGN|TF_ORIG_DFL)))
|
|
internal_errorf(1, "setexecsig: unset signal %d(%s)",
|
|
p->signal, p->name);
|
|
|
|
/* restore original value for exec'd kids */
|
|
p->flags &= ~(TF_EXEC_IGN|TF_EXEC_DFL);
|
|
switch (restore & SS_RESTORE_MASK) {
|
|
case SS_RESTORE_CURR: /* leave things as they currently are */
|
|
break;
|
|
case SS_RESTORE_ORIG:
|
|
p->flags |= p->flags & TF_ORIG_IGN ? TF_EXEC_IGN : TF_EXEC_DFL;
|
|
break;
|
|
case SS_RESTORE_DFL:
|
|
p->flags |= TF_EXEC_DFL;
|
|
break;
|
|
case SS_RESTORE_IGN:
|
|
p->flags |= TF_EXEC_IGN;
|
|
break;
|
|
}
|
|
}
|