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authorMichael K. Johnson <johnsonm@redhat.com>1999-09-28 17:25:51 +0000
committerMichael K. Johnson <johnsonm@redhat.com>1999-09-28 17:25:51 +0000
commit167594b1a3c84074c8964daf1a973db61dbf3f0d (patch)
treeafe6ba06ca83d51046621ae93be3f1697da7cc2c /src/ppp-watch.c
parent657e862839bed6c32d85c9e9117ece3bc34af27b (diff)
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proper file locking
Diffstat (limited to 'src/ppp-watch.c')
-rw-r--r--src/ppp-watch.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/src/ppp-watch.c b/src/ppp-watch.c
index fefbc8b9..043b8612 100644
--- a/src/ppp-watch.c
+++ b/src/ppp-watch.c
@@ -175,6 +175,7 @@ doPidFile(char *device) {
static char *pidFileName = NULL;
char *pidFilePath;
int fd; FILE *f;
+ int pid = 0;
if (pidFileName) {
/* remove it */
@@ -188,8 +189,25 @@ doPidFile(char *device) {
pidFileName = device;
pidFilePath = alloca(strlen(pidFileName) + 25);
sprintf(pidFilePath, "/var/run/pppwatch-%s.pid", pidFileName);
- fd = open(pidFilePath, O_WRONLY|O_TRUNC|O_CREAT,
+ fd = open(pidFilePath, O_WRONLY|O_TRUNC|O_CREAT|O_EXCL,
S_IRUSR|S_IWUSR | S_IRGRP | S_IROTH);
+ if (fd == -1) {
+ /* file already existed, or terrible things have happened... */
+ fd = open(pidFilePath, O_RDONLY);
+ if (fd == -1)
+ cleanExit(36); /* terrible things have happened */
+ /* already running, send a SIGHUP (we presume that they
+ * are calling ifup for a reason, so they probably want
+ * to redial) and then exit cleanly and let things go
+ * on in the background
+ */
+ f = fdopen(fd, "r");
+ if (!f) cleanExit(37);
+ if (fscanf(f, "%d", &pid) && pid)
+ kill(pid, SIGHUP);
+ fclose(f);
+ cleanExit(0);
+ }
f = fdopen(fd, "w");
if (f) {
fprintf(f, "%d\n", getpid());
@@ -478,7 +496,7 @@ main(int argc, char **argv) {
if (physicalDevice) { free(physicalDevice); physicalDevice = NULL; }
physicalDevice = pppLogicalToPhysical(&pppdPid, device);
if (physicalDevice) { free(physicalDevice); physicalDevice = NULL; }
- if (!pppdPid) cleanExit(34);
+ if (!pppdPid) cleanExit(35);
kill(pppdPid, sendsig);
if (sendsig == SIGKILL) {
kill(-pppdPid, SIGTERM); /* give it a chance to die nicely */