diff options
Diffstat (limited to 'libbb/pidfile.c')
-rw-r--r-- | libbb/pidfile.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/libbb/pidfile.c b/libbb/pidfile.c new file mode 100644 index 0000000..7b8fee2 --- /dev/null +++ b/libbb/pidfile.c @@ -0,0 +1,40 @@ +/* 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); +} |