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mksh/main.c

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/* $OpenBSD: main.c,v 1.41 2006/04/10 14:38:59 jaredy Exp $ */
/* $OpenBSD: tty.c,v 1.9 2006/03/14 22:08:01 deraadt Exp $ */
/* $OpenBSD: io.c,v 1.22 2006/03/17 16:30:13 millert Exp $ */
/* $OpenBSD: table.c,v 1.12 2005/12/11 20:31:21 otto Exp $ */
#define EXTERN
#include "sh.h"
#if HAVE_LANGINFO_CODESET
#include <langinfo.h>
#endif
#if HAVE_SETLOCALE_CTYPE
#include <locale.h>
#endif
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.51 2006/11/08 23:45:47 tg Exp $");
extern char **environ;
static void reclaim(void);
static void remove_temps(struct temp *);
static const char initifs[] = "IFS= \t\n";
static const char initsubs[] = "${PS2=> } ${PS3=#? } ${PS4=+ }";
static const char *initcoms[] = {
"typeset", "-r", initvsn, NULL,
"typeset", "-x", "SHELL", "PATH", "HOME", NULL,
"typeset", "-i", "PPID", "OPTIND=1", NULL,
"eval", "typeset -i RANDOM SECONDS=\"${SECONDS-0}\" TMOUT=\"${TMOUT-0}\"", NULL,
"alias",
/* Standard ksh aliases */
"hash=alias -t", /* not "alias -t --": hash -r needs to work */
"type=whence -v",
"stop=kill -STOP",
"suspend=kill -STOP $$",
"autoload=typeset -fu",
"functions=typeset -f",
"history=fc -l",
"integer=typeset -i",
"nohup=nohup ",
"local=typeset",
"r=fc -e -",
/* Aliases that are builtin commands in at&t */
"login=exec login",
NULL,
/* this is what at&t ksh seems to track, with the addition of emacs */
"alias", "-tU",
"cat", "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
"make", "mv", "pr", "rm", "sed", "sh", "vi", "who", NULL,
NULL
};
static int initio_done;
int
main(int argc, char *argv[])
{
int i;
int argi;
Source *s;
struct block *l;
int restricted, errexit;
char **wp;
struct env env;
pid_t ppid;
struct tbl *vp;
struct stat s_stdin;
#if HAVE_SETLOCALE_CTYPE
const char *cc;
#endif
/* make sure argv[] is sane */
if (!*argv) {
static const char *empty_argv[] = {
"mksh", NULL
};
argv = (char **)empty_argv;
argc = 1;
}
kshname = *argv;
ainit(&aperm); /* initialize permanent Area */
/* set up base environment */
memset(&env, 0, sizeof(env));
env.type = E_NONE;
ainit(&env.area);
e = &env;
newblock(); /* set up global l->vars and l->funs */
/* Do this first so output routines (eg, errorf, shellf) can work */
initio();
argi = parse_args(argv, OF_FIRSTTIME, NULL);
if (argi < 0)
exit(1);
initvar();
initctypes();
inittraps();
coproc_init();
/* set up variable and command dictionaries */
ktinit(&taliases, APERM, 0);
ktinit(&aliases, APERM, 0);
ktinit(&homedirs, APERM, 0);
/* define shell keywords */
initkeywords();
/* define built-in commands */
ktinit(&builtins, APERM, 64); /* must be 2^n (currently 40 builtins) */
for (i = 0; shbuiltins[i].name != NULL; i++)
builtin(shbuiltins[i].name, shbuiltins[i].func);
for (i = 0; kshbuiltins[i].name != NULL; i++)
builtin(kshbuiltins[i].name, kshbuiltins[i].func);
init_histvec();
def_path = _PATH_DEFPATH;
#ifdef _CS_PATH
{
size_t len;
char *new;
if ((len = confstr(_CS_PATH, NULL, 0)) > 0) {
confstr(_CS_PATH, new = alloc(len + 1, APERM), len + 1);
def_path = new;
}
}
#endif
/* Set PATH to def_path (will set the path global variable).
* (import of environment below will probably change this setting).
*/
vp = global("PATH");
/* setstr can't fail here */
setstr(vp, def_path, KSH_RETURN_ERROR);
#if HAVE_SETLOCALE_CTYPE
/* Check if we're in an UTF-8 locale */
cc = setlocale(LC_CTYPE, "");
#if HAVE_LANGINFO_CODESET
if (strcasecmp(cc, "UTF-8") && strcasecmp(cc, "utf8") &&
strcasecmp(cc, "CESU-8") && strcasecmp(cc, "cesu8"))
cc = nl_langinfo(CODESET);
#endif
if (!strcasecmp(cc, "UTF-8") || !strcasecmp(cc, "utf8") ||
!strcasecmp(cc, "CESU-8") || !strcasecmp(cc, "cesu8"))
Flag(FUTFHACK) = 1;
#endif
/* Turn on nohup by default for now - will change to off
* by default once people are aware of its existence
* (at&t ksh does not have a nohup option - it always sends
* the hup).
*/
Flag(FNOHUP) = 1;
/* Turn on brace expansion by default. AT&T kshs that have
* alternation always have it on.
*/
Flag(FBRACEEXPAND) = 1;
/* Set edit mode to emacs by default, may be overridden
* by the environment or the user. Also, we want tab completion
* on in vi by default. */
change_flag(FEMACS, OF_SPECIAL, 1);
Flag(FVITABCOMPLETE) = 1;
/* import environment */
if (environ != NULL)
for (wp = environ; *wp != NULL; wp++)
typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
kshpid = procpid = getpid();
typeset(initifs, 0, 0, 0, 0); /* for security */
/* assign default shell variable values */
substitute(initsubs, 0);
/* Figure out the current working directory and set $PWD */
{
struct stat s_pwd, s_dot;
struct tbl *pwd_v = global("PWD");
char *pwd = str_val(pwd_v);
char *pwdx = pwd;
/* Try to use existing $PWD if it is valid */
if (pwd[0] != '/' ||
stat(pwd, &s_pwd) < 0 || stat(".", &s_dot) < 0 ||
s_pwd.st_dev != s_dot.st_dev ||
s_pwd.st_ino != s_dot.st_ino)
pwdx = NULL;
set_current_wd(pwdx);
if (current_wd[0])
simplify_path(current_wd);
/* Only set pwd if we know where we are or if it had a
* bogus value
*/
if (current_wd[0] || pwd != null)
/* setstr can't fail here */
setstr(pwd_v, current_wd, KSH_RETURN_ERROR);
}
ppid = getppid();
#if !HAVE_ARC4RANDOM
srand(((long)kshname) ^ ((long)time(NULL) * kshpid * ppid));
#endif
setint(global("PPID"), (long)ppid);
/* execute initialisation statements */
for (wp = (char **)initcoms; *wp != NULL; wp++) {
shcomexec(wp);
for (; *wp != NULL; wp++)
;
}
ksheuid = geteuid();
kshuid = getuid();
kshegid = getegid();
kshgid = getgid();
safe_prompt = ksheuid ? "$ " : "# ";
vp = global("PS1");
/* Set PS1 if unset or we are root and prompt doesn't contain a # */
if (!(vp->flag & ISSET) ||
(!ksheuid && !strchr(str_val(vp), '#')))
/* setstr can't fail here */
setstr(vp, safe_prompt, KSH_RETURN_ERROR);
/* Set this before parsing arguments */
Flag(FPRIVILEGED) = kshuid != ksheuid || kshgid != kshegid;
/* this to note if monitor is set on command line (see below) */
Flag(FMONITOR) = 127;
argi = parse_args(argv, OF_CMDLINE, NULL);
if (argi < 0)
exit(1);
if (Flag(FCOMMAND)) {
s = pushs(SSTRING, ATEMP);
if (!(s->start = s->str = argv[argi++]))
errorf("-c requires an argument");
if (argv[argi])
kshname = argv[argi++];
} else if (argi < argc && !Flag(FSTDIN)) {
s = pushs(SFILE, ATEMP);
s->file = kshname = argv[argi++];
s->u.shf = shf_open(s->file, O_RDONLY, 0,
SHF_MAPHI | SHF_CLEXEC);
if (s->u.shf == NULL) {
exstat = 127; /* POSIX */
errorf("%s: %s", s->file, strerror(errno));
}
} else {
Flag(FSTDIN) = 1;
s = pushs(SSTDIN, ATEMP);
s->file = "<stdin>";
s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
NULL);
if (isatty(0) && isatty(2)) {
Flag(FTALKING) = Flag(FTALKING_I) = 1;
/* The following only if isatty(0) */
s->flags |= SF_TTY;
s->u.shf->flags |= SHF_INTERRUPT;
s->file = NULL;
}
}
/* This bizarreness is mandated by POSIX */
if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
Flag(FTALKING))
reset_nonblock(0);
/* initialize job control */
i = Flag(FMONITOR) != 127;
Flag(FMONITOR) = 0;
j_init(i);
/* Do this after j_init(), as tty_fd is not initialized 'til then */
if (Flag(FTALKING))
x_init();
l = e->loc;
l->argv = &argv[argi - 1];
l->argc = argc - argi;
l->argv[0] = (char *)kshname;
getopts_reset(1);
/* Disable during .profile/ENV reading */
restricted = Flag(FRESTRICTED);
Flag(FRESTRICTED) = 0;
errexit = Flag(FERREXIT);
Flag(FERREXIT) = 0;
/* Do this before profile/$ENV so that if it causes problems in them,
* user will know why things broke.
*/
if (!current_wd[0] && Flag(FTALKING))
warningf(false, "Cannot determine current working directory");
if (Flag(FLOGIN)) {
include(KSH_SYSTEM_PROFILE, 0, NULL, 1);
if (!Flag(FPRIVILEGED))
include(substitute("$HOME/.profile", 0), 0,
NULL, 1);
}
if (Flag(FPRIVILEGED))
include("/etc/suid_profile", 0, NULL, 1);
else if (Flag(FTALKING)) {
char *env_file;
/* include $ENV */
env_file = substitute(substitute("${ENV:-~/.mkshrc}", 0),
DOTILDE);
if (*env_file != '\0')
include(env_file, 0, NULL, 1);
}
if (restricted) {
static const char *const restr_com[] = {
"typeset", "-r", "PATH",
"ENV", "SHELL",
NULL
};
shcomexec((char **)restr_com);
/* After typeset command... */
Flag(FRESTRICTED) = 1;
}
if (errexit)
Flag(FERREXIT) = 1;
if (Flag(FTALKING)) {
hist_init(s);
alarm_init();
} else
Flag(FTRACKALL) = 1; /* set after ENV */
shell(s, true); /* doesn't return */
return 0;
}
int
include(const char *name, int argc, char **argv, int intr_ok)
{
Source *volatile s = NULL;
struct shf *shf;
char **volatile old_argv;
volatile int old_argc;
int i;
shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
if (shf == NULL)
return -1;
if (argv) {
old_argv = e->loc->argv;
old_argc = e->loc->argc;
} else {
old_argv = NULL;
old_argc = 0;
}
newenv(E_INCL);
i = sigsetjmp(e->jbuf, 0);
if (i) {
quitenv(s ? s->u.shf : NULL);
if (old_argv) {
e->loc->argv = old_argv;
e->loc->argc = old_argc;
}
switch (i) {
case LRETURN:
case LERROR:
return exstat & 0xff; /* see below */
case LINTR:
/* intr_ok is set if we are including .profile or $ENV.
* If user ^Cs out, we don't want to kill the shell...
*/
if (intr_ok && (exstat - 128) != SIGTERM)
return 1;
/* FALLTHRU */
case LEXIT:
case LLEAVE:
case LSHELL:
unwind(i);
/* NOTREACHED */
default:
internal_errorf(1, "include: %d", i);
/* NOTREACHED */
}
}
if (argv) {
e->loc->argv = argv;
e->loc->argc = argc;
}
s = pushs(SFILE, ATEMP);
s->u.shf = shf;
s->file = str_save(name, ATEMP);
i = shell(s, false);
quitenv(s->u.shf);
if (old_argv) {
e->loc->argv = old_argv;
e->loc->argc = old_argc;
}
return i & 0xff; /* & 0xff to ensure value not -1 */
}
int
command(const char *comm)
{
Source *s;
s = pushs(SSTRING, ATEMP);
s->start = s->str = comm;
return shell(s, false);
}
/*
* run the commands from the input source, returning status.
*/
int
shell(Source * volatile s, volatile int toplevel)
{
struct op *t;
volatile int wastty = s->flags & SF_TTY;
volatile int attempts = 13;
volatile int interactive = Flag(FTALKING) && toplevel;
Source *volatile old_source = source;
int i;
newenv(E_PARSE);
if (interactive)
really_exit = 0;
i = sigsetjmp(e->jbuf, 0);
if (i) {
switch (i) {
case LINTR: /* we get here if SIGINT not caught or ignored */
case LERROR:
case LSHELL:
if (interactive) {
if (i == LINTR)
shellf(newline);
/* Reset any eof that was read as part of a
* multiline command.
*/
if (Flag(FIGNOREEOF) && s->type == SEOF &&
wastty)
s->type = SSTDIN;
/* Used by exit command to get back to
* top level shell. Kind of strange since
* interactive is set if we are reading from
* a tty, but to have stopped jobs, one only
* needs FMONITOR set (not FTALKING/SF_TTY)...
*/
/* toss any input we have so far */
s->start = s->str = null;
break;
}
/* FALLTHRU */
case LEXIT:
case LLEAVE:
case LRETURN:
source = old_source;
quitenv(NULL);
unwind(i); /* keep on going */
/* NOTREACHED */
default:
source = old_source;
quitenv(NULL);
internal_errorf(1, "shell: %d", i);
/* NOTREACHED */
}
}
while (1) {
if (trap)
runtraps(0);
if (s->next == NULL) {
if (Flag(FVERBOSE))
s->flags |= SF_ECHO;
else
s->flags &= ~SF_ECHO;
}
if (interactive) {
j_notify();
set_prompt(PS1, s);
}
t = compile(s);
if (t != NULL && t->type == TEOF) {
if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
shellf("Use 'exit' to leave ksh\n");
s->type = SSTDIN;
} else if (wastty && !really_exit &&
j_stopped_running()) {
really_exit = 1;
s->type = SSTDIN;
} else {
/* this for POSIX which says EXIT traps
* shall be taken in the environment
* immediately after the last command
* executed.
*/
if (toplevel)
unwind(LEXIT);
break;
}
}
if (t && (!Flag(FNOEXEC) || (s->flags & SF_TTY)))
exstat = execute(t, 0);
if (t != NULL && t->type != TEOF && interactive && really_exit)
really_exit = 0;
reclaim();
}
quitenv(NULL);
source = old_source;
return exstat;
}
/* return to closest error handler or shell(), exit if none found */
void
unwind(int i)
{
/* ordering for EXIT vs ERR is a bit odd (this is what at&t ksh does) */
if (i == LEXIT || (Flag(FERREXIT) && (i == LERROR || i == LINTR) &&
sigtraps[SIGEXIT_].trap)) {
runtrap(&sigtraps[SIGEXIT_]);
i = LLEAVE;
} else if (Flag(FERREXIT) && (i == LERROR || i == LINTR)) {
runtrap(&sigtraps[SIGERR_]);
i = LLEAVE;
}
while (1) {
switch (e->type) {
case E_PARSE:
case E_FUNC:
case E_INCL:
case E_LOOP:
case E_ERRH:
siglongjmp(e->jbuf, i);
/* NOTREACHED */
case E_NONE:
if (i == LINTR)
e->flags |= EF_FAKE_SIGDIE;
/* FALLTHRU */
default:
quitenv(NULL);
}
}
}
void
newenv(int type)
{
struct env *ep;
ep = (struct env *) alloc(sizeof(*ep), ATEMP);
ep->type = type;
ep->flags = 0;
ainit(&ep->area);
ep->loc = e->loc;
ep->savefd = NULL;
ep->oenv = e;
ep->temps = NULL;
e = ep;
}
void
quitenv(struct shf *shf)
{
struct env *ep = e;
int fd;
if (ep->oenv && ep->oenv->loc != ep->loc)
popblock();
if (ep->savefd != NULL) {
for (fd = 0; fd < NUFILE; fd++)
/* if ep->savefd[fd] < 0, means fd was closed */
if (ep->savefd[fd])
restfd(fd, ep->savefd[fd]);
if (ep->savefd[2]) /* Clear any write errors */
shf_reopen(2, SHF_WR, shl_out);
}
/* Bottom of the stack.
* Either main shell is exiting or cleanup_parents_env() was called.
*/
if (ep->oenv == NULL) {
if (ep->type == E_NONE) { /* Main shell exiting? */
if (Flag(FTALKING))
hist_finish();
j_exit();
if (ep->flags & EF_FAKE_SIGDIE) {
int sig = exstat - 128;
/* ham up our death a bit (at&t ksh
* only seems to do this for SIGTERM)
* Don't do it for SIGQUIT, since we'd
* dump a core..
*/
if ((sig == SIGINT || sig == SIGTERM) &&
getpgrp() == kshpid) {
setsig(&sigtraps[sig], SIG_DFL,
SS_RESTORE_CURR | SS_FORCE);
kill(0, sig);
}
}
}
if (shf)
shf_close(shf);
reclaim();
exit(exstat);
}
if (shf)
shf_close(shf);
reclaim();
e = e->oenv;
afree(ep, ATEMP);
}
/* Called after a fork to cleanup stuff left over from parents environment */
void
cleanup_parents_env(void)
{
struct env *ep;
int fd;
/* Don't clean up temporary files - parent will probably need them.
* Also, can't easily reclaim memory since variables, etc. could be
* anywhere.
*/
/* close all file descriptors hiding in savefd */
for (ep = e; ep; ep = ep->oenv) {
if (ep->savefd) {
for (fd = 0; fd < NUFILE; fd++)
if (ep->savefd[fd] > 0)
close(ep->savefd[fd]);
afree(ep->savefd, &ep->area);
ep->savefd = NULL;
}
}
e->oenv = NULL;
}
/* Called just before an execve cleanup stuff temporary files */
void
cleanup_proc_env(void)
{
struct env *ep;
for (ep = e; ep; ep = ep->oenv)
remove_temps(ep->temps);
}
/* remove temp files and free ATEMP Area */
static void
reclaim(void)
{
remove_temps(e->temps);
e->temps = NULL;
afreeall(&e->area);
}
static void
remove_temps(struct temp *tp)
{
for (; tp != NULL; tp = tp->next)
if (tp->pid == procpid) {
unlink(tp->name);
}
}
/* Initialize tty_fd. Used for saving/reseting tty modes upon
* foreground job completion and for setting up tty process group.
*/
void
tty_init(int init_ttystate)
{
int do_close = 1;
int tfd;
if (tty_fd >= 0) {
close(tty_fd);
tty_fd = -1;
}
tty_devtty = 1;
if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
tty_devtty = 0;
warningf(false, "No controlling tty (open /dev/tty: %s)",
strerror(errno));
}
if (tfd < 0) {
do_close = 0;
if (isatty(0))
tfd = 0;
else if (isatty(2))
tfd = 2;
else {
warningf(false, "Can't find tty file descriptor");
return;
}
}
if ((tty_fd = fcntl(tfd, F_DUPFD, FDBASE)) < 0) {
warningf(false, "j_ttyinit: dup of tty fd failed: %s",
strerror(errno));
} else if (fcntl(tty_fd, F_SETFD, FD_CLOEXEC) < 0) {
warningf(false, "j_ttyinit: can't set close-on-exec flag: %s",
strerror(errno));
close(tty_fd);
tty_fd = -1;
} else if (init_ttystate)
tcgetattr(tty_fd, &tty_state);
if (do_close)
close(tfd);
}
void
tty_close(void)
{
if (tty_fd >= 0) {
close(tty_fd);
tty_fd = -1;
}
}
/* A shell error occurred (eg, syntax error, etc.) */
void
errorf(const char *fmt, ...)
{
va_list va;
shl_stdout_ok = 0; /* debugging: note that stdout not valid */
exstat = 1;
if (*fmt) {
error_prefix(true);
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
}
shf_flush(shl_out);
unwind(LERROR);
}
/* like errorf(), but no unwind is done */
void
warningf(int fileline, const char *fmt, ...)
{
va_list va;
error_prefix(fileline);
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
shf_flush(shl_out);
}
/* Used by built-in utilities to prefix shell and utility name to message
* (also unwinds environments for special builtins).
*/
void
bi_errorf(const char *fmt, ...)
{
va_list va;
shl_stdout_ok = 0; /* debugging: note that stdout not valid */
exstat = 1;
if (*fmt) {
error_prefix(true);
/* not set when main() calls parse_args() */
if (builtin_argv0)
shf_fprintf(shl_out, "%s: ", builtin_argv0);
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
}
shf_flush(shl_out);
/* POSIX special builtins and ksh special builtins cause
* non-interactive shells to exit.
* XXX odd use of KEEPASN; also may not want LERROR here
*/
if (builtin_flag & SPEC_BI) {
builtin_argv0 = NULL;
unwind(LERROR);
}
}
/* Called when something that shouldn't happen does */
void
internal_errorf(int jump, const char *fmt, ...)
{
va_list va;
error_prefix(true);
shf_fprintf(shl_out, "internal error: ");
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
shf_flush(shl_out);
if (jump)
unwind(LERROR);
}
/* used by error reporting functions to print "ksh: .kshrc[25]: " */
void
error_prefix(int fileline)
{
/* Avoid foo: foo[2]: ... */
if (!fileline || !source || !source->file ||
strcmp(source->file, kshname) != 0)
shf_fprintf(shl_out, "%s: ", kshname + (*kshname == '-'));
if (fileline && source && source->file != NULL) {
shf_fprintf(shl_out, "%s[%d]: ", source->file,
source->errline > 0 ? source->errline : source->line);
source->errline = 0;
}
}
/* printf to shl_out (stderr) with flush */
void
shellf(const char *fmt, ...)
{
va_list va;
if (!initio_done) /* shl_out may not be set up yet... */
return;
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_flush(shl_out);
}
/* printf to shl_stdout (stdout) */
void
shprintf(const char *fmt, ...)
{
va_list va;
if (!shl_stdout_ok)
internal_errorf(1, "shl_stdout not valid");
va_start(va, fmt);
shf_vfprintf(shl_stdout, fmt, va);
va_end(va);
}
/* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
int
can_seek(int fd)
{
struct stat statb;
return fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
SHF_UNBUF : 0;
}
struct shf shf_iob[3];
void
initio(void)
{
shf_fdopen(1, SHF_WR, shl_stdout); /* force buffer allocation */
shf_fdopen(2, SHF_WR, shl_out);
shf_fdopen(2, SHF_WR, shl_spare); /* force buffer allocation */
initio_done = 1;
}
/* A dup2() with error checking */
int
ksh_dup2(int ofd, int nfd, int errok)
{
int ret = dup2(ofd, nfd);
if (ret < 0 && errno != EBADF && !errok)
errorf("too many files open in shell");
return ret;
}
/*
* move fd from user space (0<=fd<10) to shell space (fd>=10),
* set close-on-exec flag.
*/
int
savefd(int fd)
{
int nfd;
if (fd < FDBASE) {
nfd = fcntl(fd, F_DUPFD, FDBASE);
if (nfd < 0) {
if (errno == EBADF)
return -1;
else
errorf("too many files open in shell");
}
} else
nfd = fd;
fcntl(nfd, F_SETFD, FD_CLOEXEC);
return nfd;
}
void
restfd(int fd, int ofd)
{
if (fd == 2)
shf_flush(&shf_iob[fd]);
if (ofd < 0) /* original fd closed */
close(fd);
else if (fd != ofd) {
ksh_dup2(ofd, fd, true); /* XXX: what to do if this fails? */
close(ofd);
}
}
void
openpipe(int *pv)
{
int lpv[2];
if (pipe(lpv) < 0)
errorf("can't create pipe - try again");
pv[0] = savefd(lpv[0]);
if (pv[0] != lpv[0])
close(lpv[0]);
pv[1] = savefd(lpv[1]);
if (pv[1] != lpv[1])
close(lpv[1]);
}
void
closepipe(int *pv)
{
close(pv[0]);
close(pv[1]);
}
/* Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
* a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
*/
int
check_fd(char *name, int mode, const char **emsgp)
{
int fd, fl;
if (isdigit((unsigned char)name[0]) && !name[1]) {
fd = name[0] - '0';
if ((fl = fcntl(fd = name[0] - '0', F_GETFL, 0)) < 0) {
if (emsgp)
*emsgp = "bad file descriptor";
return -1;
}
fl &= O_ACCMODE;
/* X_OK is a kludge to disable this check for dups (x<&1):
* historical shells never did this check (XXX don't know what
* posix has to say).
*/
if (!(mode & X_OK) && fl != O_RDWR &&
(((mode & R_OK) && fl != O_RDONLY) ||
((mode & W_OK) && fl != O_WRONLY))) {
if (emsgp)
*emsgp = (fl == O_WRONLY) ?
"fd not open for reading" :
"fd not open for writing";
return -1;
}
return fd;
} else if (name[0] == 'p' && !name[1])
return coproc_getfd(mode, emsgp);
if (emsgp)
*emsgp = "illegal file descriptor name";
return -1;
}
/* Called once from main */
void
coproc_init(void)
{
coproc.read = coproc.readw = coproc.write = -1;
coproc.njobs = 0;
coproc.id = 0;
}
/* Called by c_read() when eof is read - close fd if it is the co-process fd */
void
coproc_read_close(int fd)
{
if (coproc.read >= 0 && fd == coproc.read) {
coproc_readw_close(fd);
close(coproc.read);
coproc.read = -1;
}
}
/* Called by c_read() and by iosetup() to close the other side of the
* read pipe, so reads will actually terminate.
*/
void
coproc_readw_close(int fd)
{
if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
close(coproc.readw);
coproc.readw = -1;
}
}
/* Called by c_print when a write to a fd fails with EPIPE and by iosetup
* when co-process input is dup'd
*/
void
coproc_write_close(int fd)
{
if (coproc.write >= 0 && fd == coproc.write) {
close(coproc.write);
coproc.write = -1;
}
}
/* Called to check for existence of/value of the co-process file descriptor.
* (Used by check_fd() and by c_read/c_print to deal with -p option).
*/
int
coproc_getfd(int mode, const char **emsgp)
{
int fd = (mode & R_OK) ? coproc.read : coproc.write;
if (fd >= 0)
return fd;
if (emsgp)
*emsgp = "no coprocess";
return -1;
}
/* called to close file descriptors related to the coprocess (if any)
* Should be called with SIGCHLD blocked.
*/
void
coproc_cleanup(int reuse)
{
/* This to allow co-processes to share output pipe */
if (!reuse || coproc.readw < 0 || coproc.read < 0) {
if (coproc.read >= 0) {
close(coproc.read);
coproc.read = -1;
}
if (coproc.readw >= 0) {
close(coproc.readw);
coproc.readw = -1;
}
}
if (coproc.write >= 0) {
close(coproc.write);
coproc.write = -1;
}
}
struct temp *
maketemp(Area *ap, Temp_type type, struct temp **tlist)
{
struct temp *tp;
int len;
int fd;
char *pathname;
const char *dir;
dir = tmpdir ? tmpdir : "/tmp";
len = strlen(dir) + 6 + 10 + 1;
tp = (struct temp *) alloc(sizeof(struct temp) + len, ap);
tp->name = pathname = (char *)&tp[1];
tp->shf = NULL;
tp->type = type;
shf_snprintf(pathname, len, "%s/mksh.XXXXXXXXXX", dir);
if ((fd = mkstemp(pathname)) >= 0)
tp->shf = shf_fdopen(fd, SHF_WR, NULL);
tp->pid = procpid;
tp->next = *tlist;
*tlist = tp;
return tp;
}
#define INIT_TBLS 8 /* initial table size (power of 2) */
static void texpand(struct table *, int);
static int tnamecmp(void *, void *);
unsigned int
hash(const char *n)
{
unsigned int h = 0;
while (*n != '\0')
h = 2*h + *n++;
return h * 32821; /* scatter bits */
}
void
ktinit(struct table *tp, Area *ap, int tsize)
{
tp->areap = ap;
tp->tbls = NULL;
tp->size = tp->nfree = 0;
if (tsize)
texpand(tp, tsize);
}
static void
texpand(struct table *tp, int nsize)
{
int i;
struct tbl *tblp, **p;
struct tbl **ntblp, **otblp = tp->tbls;
int osize = tp->size;
ntblp = (struct tbl **)alloc(sizeofN(struct tbl *, nsize), tp->areap);
for (i = 0; i < nsize; i++)
ntblp[i] = NULL;
tp->size = nsize;
tp->nfree = 8 * nsize / 10; /* table can get 80% full */
tp->tbls = ntblp;
if (otblp == NULL)
return;
for (i = 0; i < osize; i++)
if ((tblp = otblp[i]) != NULL) {
if ((tblp->flag & DEFINED)) {
for (p = &ntblp[hash(tblp->name) &
(tp->size - 1)]; *p != NULL; p--)
if (p == ntblp) /* wrap */
p += tp->size;
*p = tblp;
tp->nfree--;
} else if (!(tblp->flag & FINUSE)) {
afree((void *)tblp, tp->areap);
}
}
afree((void *)otblp, tp->areap);
}
/* table */
/* name to enter */
/* hash(n) */
struct tbl *
ktsearch(struct table *tp, const char *n, unsigned int h)
{
struct tbl **pp, *p;
if (tp->size == 0)
return NULL;
/* search for name in hashed table */
for (pp = &tp->tbls[h & (tp->size - 1)]; (p = *pp) != NULL; pp--) {
if (*p->name == *n && strcmp(p->name, n) == 0 &&
(p->flag & DEFINED))
return p;
if (pp == tp->tbls) /* wrap */
pp += tp->size;
}
return NULL;
}
/* table */
/* name to enter */
/* hash(n) */
struct tbl *
ktenter(struct table *tp, const char *n, unsigned int h)
{
struct tbl **pp, *p;
int len;
if (tp->size == 0)
texpand(tp, INIT_TBLS);
Search:
/* search for name in hashed table */
for (pp = &tp->tbls[h & (tp->size - 1)]; (p = *pp) != NULL; pp--) {
if (*p->name == *n && strcmp(p->name, n) == 0)
return p; /* found */
if (pp == tp->tbls) /* wrap */
pp += tp->size;
}
if (tp->nfree <= 0) { /* too full */
texpand(tp, 2 * tp->size);
goto Search;
}
/* create new tbl entry */
len = strlen(n) + 1;
p = (struct tbl *)alloc(offsetof(struct tbl, name[0])+len,
tp->areap);
p->flag = 0;
p->type = 0;
p->areap = tp->areap;
p->u2.field = 0;
p->u.array = NULL;
memcpy(p->name, n, len);
/* enter in tp->tbls */
tp->nfree--;
*pp = p;
return p;
}
void
ktdelete(struct tbl *p)
{
p->flag = 0;
}
void
ktwalk(struct tstate *ts, struct table *tp)
{
ts->left = tp->size;
ts->next = tp->tbls;
}
struct tbl *
ktnext(struct tstate *ts)
{
while (--ts->left >= 0) {
struct tbl *p = *ts->next++;
if (p != NULL && (p->flag & DEFINED))
return p;
}
return NULL;
}
static int
tnamecmp(void *p1, void *p2)
{
return strcmp(((struct tbl *)p1)->name, ((struct tbl *)p2)->name);
}
struct tbl **
ktsort(struct table *tp)
{
int i;
struct tbl **p, **sp, **dp;
p = (struct tbl **)alloc(sizeofN(struct tbl *, tp->size + 1), ATEMP);
sp = tp->tbls; /* source */
dp = p; /* dest */
for (i = 0; i < tp->size; i++)
if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
((*dp)->flag & ARRAY)))
dp++;
i = dp - p;
qsortp((void **)p, (size_t)i, tnamecmp);
p[i] = NULL;
return p;
}
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