run-command: dup_devnull(): guard against syscalls failing

diff --git a/run-command.c b/run-command.c
index 04712191e8acfbf000c526a5b1b0a80541e8e174..afc573ed41061f7c704209de2d229e7a6a900165 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -76,7 +76,10 @@ static inline void close_pair(int fd[2])
 static inline void dup_devnull(int to)
 {
        int fd = open("/dev/null", O_RDWR);
-       dup2(fd, to);
+       if (fd < 0)
+               die_errno(_("open /dev/null failed"));
+       if (dup2(fd, to) < 0)
+               die_errno(_("dup2(%d,%d) failed"), fd, to);
        close(fd);
 }
 #endif