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41 lines
891 B
C
41 lines
891 B
C
/* vi: set sw=4 ts=4: */
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/*
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* pid file routines
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*
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* Copyright (C) 2007 by Stephane Billiart <stephane.billiart@gmail.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* Override ENABLE_FEATURE_PIDFILE */
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#define WANT_PIDFILE 1
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#include "libbb.h"
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smallint wrote_pidfile;
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void write_pidfile(const char *path)
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{
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int pid_fd;
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char *end;
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char buf[sizeof(int)*3 + 2];
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struct stat sb;
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if (!path)
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return;
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/* we will overwrite stale pidfile */
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pid_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, 0666);
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if (pid_fd < 0)
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return;
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/* path can be "/dev/null"! Test for such cases */
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wrote_pidfile = (fstat(pid_fd, &sb) == 0) && S_ISREG(sb.st_mode);
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if (wrote_pidfile) {
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/* few bytes larger, but doesn't use stdio */
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end = utoa_to_buf(getpid(), buf, sizeof(buf));
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*end = '\n';
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full_write(pid_fd, buf, end - buf + 1);
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}
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close(pid_fd);
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}
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