diff options
| -rw-r--r-- | src/stdio/fileno.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/stdio/fileno.c b/src/stdio/fileno.c index ba7f9391..0bd0e988 100644 --- a/src/stdio/fileno.c +++ b/src/stdio/fileno.c @@ -1,13 +1,16 @@ #include "stdio_impl.h" +#include <errno.h> int fileno(FILE *f) { - /* f->fd never changes, but the lock must be obtained and released - * anyway since this function cannot return while another thread - * holds the lock. */ FLOCK(f); + int fd = f->fd; FUNLOCK(f); - return f->fd; + if (fd < 0) { + errno = EBADF; + return -1; + } + return fd; } weak_alias(fileno, fileno_unlocked); |