cleanup src/linux and src/misc trees, etc.

[musl] / src / legacy / daemon.c

diff --git a/src/legacy/daemon.c b/src/legacy/daemon.c
new file mode 100644 (file)
index 0000000..1568b1d
--- /dev/null
+++ b/src/legacy/daemon.c
@@ -0,0 +1,33 @@
+#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;
+}