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2003-10-24 sowmini.varadhan@sun.com

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* lib/pid_output.c: (pid_output) call pid_output_lock if we have
          fcntl().
          (pid_output_lock) grab exclusive write lock on pid file, rather
	  than rely on (fragile) exclusive create.
This commit is contained in:
paul 2003-10-24 04:10:16 +00:00
parent b1809beadd
commit e92fbaf27e
1 changed files with 24 additions and 15 deletions
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41
lib/pid_output.c
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@ -21,10 +21,15 @@
*/ */
#include <zebra.h> #include <zebra.h>
#include <fcntl.h>
#include <log.h>
pid_t pid_output_lock(char *);
pid_t pid_t
pid_output (char *path) pid_output (char *path)
{ {
#ifndef HAVE_FCNTL
FILE *fp; FILE *fp;
pid_t pid; pid_t pid;
@ -38,40 +43,44 @@ pid_output (char *path)
return -1; return -1;
} }
return pid; return pid;
#else
return pid_output_lock(path);
#endif /* HAVE_FCNTL */
} }
#ifdef HAVE_FCNTL
pid_t pid_t
pid_output_lock (char *path) pid_output_lock (char *path)
{ {
int tmp; int tmp;
int fd; int fd;
pid_t pid; pid_t pid;
char buf[16], *p; char buf[16];
struct flock lock = { .l_type = F_WRLCK,
.l_whence = SEEK_END };
pid = getpid (); pid = getpid ();
fd = open (path, O_RDWR | O_CREAT | O_EXCL, 0644); fd = open (path, O_RDWR | O_CREAT, 0644);
if (fd < 0) if (fd < 0)
{ {
fd = open (path, O_RDONLY); zlog_err( "Can't creat pid lock file %s (%s), exit",
if (fd < 0) path, strerror(errno));
fprintf (stderr, "Can't creat pid lock file, exit\n");
else
{
read (fd, buf, sizeof (buf));
if ((p = index (buf, '\n')) != NULL)
*p = 0;
fprintf (stderr, "Another process(%s) running, exit\n", buf);
}
exit (-1); exit (-1);
} }
else else
{ {
sprintf (buf, "%d\n", (int) pid); memset (&lock, 0, sizeof(lock));
tmp = write (fd, buf, strlen (buf));
close (fd); if (fcntl(fd, F_SETLK, &lock) < 0)
{
zlog_err("Could not lock pid_file %s, exit", path);
exit (-1);
} }
sprintf (buf, "%d\n", (int) pid);
tmp = write (fd, buf, strlen (buf));
}
return pid; return pid;
} }
#endif /* HAVE_FCNTL */