/* 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 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); }