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#define _GNU_SOURCE
#include <fcntl.h>
#include <unistd.h>
int daemon(int nochdir, int noclose)
{
if (!nochdir && chdir("/"))
return -1;
if (!noclose) {
int fd, failed = 0;
if ((fd = open("/dev/null", O_RDWR)) < 0) return -1;
if (dup2(fd, 0) < 0 || dup2(fd, 1) < 0 || dup2(fd, 2) < 0)
failed++;
if (fd > 2) close(fd);
if (failed) return -1;
}
switch(fork()) {
case 0: break;
case -1: return -1;
default: _exit(0);
}
if (setsid() < 0) return -1;
switch(fork()) {
case 0: break;
case -1: return -1;
default: _exit(0);
}
return 0;
}
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