diff options
Diffstat (limited to 'misc/daemon.c')
| -rw-r--r-- | misc/daemon.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/misc/daemon.c b/misc/daemon.c index bfa5f2edd3..dddb765daf 100644 --- a/misc/daemon.c +++ b/misc/daemon.c @@ -34,6 +34,9 @@ static char sccsid[] = "@(#)daemon.c 8.1 (Berkeley) 6/4/93"; #include <fcntl.h> #include <paths.h> #include <unistd.h> +#include <sys/stat.h> + +#include <device-nrs.h> int daemon(nochdir, noclose) @@ -57,11 +60,23 @@ daemon(nochdir, noclose) (void)__chdir("/"); if (!noclose && (fd = __open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { - (void)__dup2(fd, STDIN_FILENO); - (void)__dup2(fd, STDOUT_FILENO); - (void)__dup2(fd, STDERR_FILENO); - if (fd > 2) + struct stat64 st; + + if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) == 0 + && __builtin_expect (S_ISCHR (st.st_mode), 1) != 0 +#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR + && st.st_rdev == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR) +#endif + ) { + (void)__dup2(fd, STDIN_FILENO); + (void)__dup2(fd, STDOUT_FILENO); + (void)__dup2(fd, STDERR_FILENO); + if (fd > 2) + (void)__close (fd); + } else { (void)__close (fd); + return -1; + } } return (0); } |