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