daemon should check for failures and return -1

[musl] / src / linux / daemon.c

diff --git a/src/linux/daemon.c b/src/linux/daemon.c
index 632d120..3750fc3 100644 (file)
--- a/src/linux/daemon.c
+++ b/src/linux/daemon.c
@@ -19,12 +19,15 @@ int daemon(int nochdir, int noclose)
        default: _exit(0);
        }
 
-       if (!nochdir) chdir("/");
-       if (!noclose && (fd = open("/dev/null", O_RDWR)) >= 0) {
-               dup2(fd, 0);
-               dup2(fd, 1);
-               dup2(fd, 2);
+       if (!nochdir && chdir("/"))
+               return -1;
+       if (!noclose) {
+               int 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;
        }
 
        return 0;