87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
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* See /doc/license/gpl-2.0.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 9front's team.
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* See /doc/license/9front-mit for details about the licensing.
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* See http://git.9front.org/plan9front/plan9front/HEAD/info.html for a list of authors.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <bio.h>
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void
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usage(void)
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{
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fprint(2, "usage: xargs [ -n lines ] [ -p procs ] args ...\n");
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exits("usage");
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}
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void
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dowait(void)
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{
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while(waitpid() != -1)
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;
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}
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void
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main(int argc, char **argv)
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{
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int lines, procs, i, j, run;
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char **nargv, **args, **p;
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static Biobuf bp;
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lines = 10;
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procs = 1;
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ARGBEGIN {
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case 'n': lines = atoi(EARGF(usage())); break;
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case 'p': procs = atoi(EARGF(usage())); break;
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default: usage();
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} ARGEND;
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if(argc < 1)
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usage();
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nargv = malloc(sizeof(char *) * (argc + lines + 1));
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if(nargv == nil)
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sysfatal("malloc: %r");
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memcpy(nargv, argv, sizeof(char *) * argc);
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args = nargv + argc;
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if(Binit(&bp, 0, OREAD) < 0)
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sysfatal("Binit: %r");
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atexit(dowait);
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for(j = 0, run = 1; run; j++){
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if(j >= procs)
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waitpid();
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memset(args, 0, sizeof(char *) * (lines + 1));
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for(i = 0; i < lines; i++)
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if((args[i] = Brdstr(&bp, '\n', 1)) == nil){
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if(i == 0)
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exits(nil);
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run = 0;
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break;
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}
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switch(fork()){
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case -1:
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sysfatal("fork: %r");
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case 0:
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sys_exec(*nargv, (const char**)nargv);
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if(**nargv != '/' && strncmp(*nargv, "./", 2) != 0 &&
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strncmp(*nargv, "../", 3) != 0){
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*nargv = smprint("/cmd/%s", *nargv);
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sys_exec(*nargv, (const char**)nargv);
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}
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sysfatal("exec: %r");
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}
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for(p = args; *p; p++)
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free(*p);
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}
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exits(nil);
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}
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