mirror of
https://github.com/0intro/wmii
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44 lines
797 B
C
44 lines
797 B
C
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/* Copyright ©2008-2010 Kris Maglione <maglione.k at Gmail>
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* See LICENSE file for license details.
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*/
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#include <errno.h>
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#include <unistd.h>
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#include "util.h"
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int
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spawn3(int fd[3], const char *file, char *argv[]) {
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/* Some ideas from Russ Cox's libthread port. */
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int p[2];
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int pid;
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if(pipe(p) < 0)
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return -1;
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closeexec(p[1]);
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switch(pid = doublefork()) {
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case 0:
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dup2(fd[0], 0);
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dup2(fd[1], 1);
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dup2(fd[2], 2);
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execvp(file, argv);
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write(p[1], &errno, sizeof errno);
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exit(1);
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break;
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default:
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close(p[1]);
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if(read(p[0], &errno, sizeof errno) == sizeof errno)
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pid = -1;
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close(p[0]);
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break;
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case -1: /* can't happen */
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break;
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}
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close(fd[0]);
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/* These could fail if any of these was also a previous fd. */
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close(fd[1]);
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close(fd[2]);
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return pid;
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}
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