#define WANT_PIDFILE 1
#include "libbb.h"
-int write_pidfile(const char *path)
+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 1;
+ return;
/* we will overwrite stale pidfile */
pid_fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, 0666);
if (pid_fd < 0)
- return 0;
- /* 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);
+ 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);
- return 1;
}