From f416563b284a9656ed012f6e078d3498b3403781 Mon Sep 17 00:00:00 2001 From: Sami Kerola Date: Sat, 13 Apr 2013 20:54:44 +0100 Subject: [PATCH] include: add close_fd() for noticing write errors before close() Essentially this helper function is similar to close_stream(), but for file descriptors. When a file descriptors are close()'d status of write is often overlooked. The close_fd() will try to determine what happen to writes with fsync() before closing the file descriptor. Signed-off-by: Sami Kerola --- include/closestream.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/closestream.h b/include/closestream.h index d61b83b5e..2535c8b22 100644 --- a/include/closestream.h +++ b/include/closestream.h @@ -48,4 +48,23 @@ close_stdout(void) _exit(EXIT_FAILURE); } +#ifndef HAVE_FSYNC +static inline int +fsync(int fd __attribute__((__unused__))) +{ + return 0; +} +#endif + +static inline int +close_fd(int fd) +{ + const int fsync_fail = (fsync(fd) != 0); + const int close_fail = (close(fd) != 0); + + if (fsync_fail || close_fail) + return EOF; + return 0; +} + #endif /* UTIL_LINUX_CLOSESTREAM_H */