dup3: don't set FD_CLOEXEC on failure on kernels without dup3 syscall

[musl] / src / unistd / dup3.c

diff --git a/src/unistd/dup3.c b/src/unistd/dup3.c
index 1e7dc3e..40798bd 100644 (file)
--- a/src/unistd/dup3.c
+++ b/src/unistd/dup3.c
@@ -15,7 +15,8 @@ int __dup3(int old, int new, int flags)
                if (flags & ~O_CLOEXEC) return __syscall_ret(-EINVAL);
        }
        while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
-       if (flags & O_CLOEXEC) __syscall(SYS_fcntl, new, F_SETFD, FD_CLOEXEC);
+       if (r >= 0 && (flags & O_CLOEXEC))
+               __syscall(SYS_fcntl, new, F_SETFD, FD_CLOEXEC);
 #else
        while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
 #endif