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