48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
// Functions used when running in the background
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
#include "infnoise.h"
|
|
|
|
// Write af PID in a file
|
|
static bool writePid(int32_t pid, char *fileName) {
|
|
FILE *pidFile;
|
|
int ret;
|
|
pidFile = fopen(fileName,"w");
|
|
if(pidFile == NULL) {
|
|
return false;
|
|
}
|
|
ret = fprintf(pidFile, "%d\n", pid);
|
|
fclose(pidFile);
|
|
return (ret >= 0);
|
|
}
|
|
|
|
void startDaemon(struct opt_struct* opts) {
|
|
if(!opts->daemon) {
|
|
// No backgrounding, optionslly write current PID
|
|
if(opts->pidFileName != NULL) {
|
|
writePid(getpid(), opts->pidFileName);
|
|
}
|
|
return;
|
|
}
|
|
int32_t pid = fork();
|
|
if(pid < 0) {
|
|
fputs("fork() failed\n", stderr);
|
|
exit(1);
|
|
} else if(pid > 0) {
|
|
// Parent
|
|
if(opts->pidFileName != NULL) {
|
|
if(!writePid(pid, opts->pidFileName)) {
|
|
exit(1);
|
|
}
|
|
}
|
|
exit(0);
|
|
}
|
|
// Child
|
|
}
|
|
|