From 1e11c34be4decfef8fbda8a8e01cd60def8232e5 Mon Sep 17 00:00:00 2001 From: Glenn L McGrath Date: Sun, 11 May 2003 14:52:39 +0000 Subject: minit, a Minimal init system. --- init/pidfilehack.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 init/pidfilehack.c (limited to 'init/pidfilehack.c') diff --git a/init/pidfilehack.c b/init/pidfilehack.c new file mode 100644 index 000000000..a2d905b55 --- /dev/null +++ b/init/pidfilehack.c @@ -0,0 +1,78 @@ +/* + * minit version 0.9.1 by Felix von Leitner + * ported to busybox by Glenn McGrath + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include +#include +#include +#include + +#include "busybox.h" +/* purpose: argv[1] is the full path to a PID file, + * argv+2 is the daemon to run. + * the daemon is expected to fork in the background and write its PID in + * the pid file. + */ + +extern int pidfilehack_main(int argc, char **argv) +{ + int count = 0; + + if (argc < 3) { + bb_show_usage(); + + } + if (unlink(argv[2]) && (errno != ENOENT)) { + bb_perror_msg("could not remove pid file"); + } + switch (fork()) { + case -1: + bb_perror_msg("could not fork"); + return 2; + case 0: /* child */ + execv(argv[3], argv + 3); + bb_perror_msg("execvp failed"); + return 3; + } + do { + int fd = open(argv[2], O_RDONLY); + + if (fd >= 0) { + static char buf[100] = "-P"; + int len = read(fd, buf + 2, 100); + + close(fd); + if (len > 0) { + char *_argv[] = { "msvc", 0, 0, 0 }; + if (buf[len + 1] == '\n') { + buf[len + 1] = 0; + } else { + buf[len + 2] = 0; + } + _argv[1] = buf; + _argv[2] = argv[1]; + execvp(_argv[0], _argv); + bb_perror_msg("execvp failed"); + return 0; + } + } + sleep(1); + } while (++count < 30); + + return(0); +} -- cgit v1.2.3