Save/restore errno in all safe wrappers

1 files changed, 4 insertions, 1 deletions

diff --git a/src/libstddjb/fd_writev.c b/src/libstddjb/fd_writev.c
index 61f7132..ce9dd17 100644
--- a/src/libstddjb/fd_writev.c
+++ b/src/libstddjb/fd_writev.c
@@ -2,12 +2,15 @@
 
 #include <sys/uio.h>
 #include <errno.h>
+
 #include <skalibs/allreadwrite.h>
 
 ssize_t fd_writev (int fd, struct iovec const *v, unsigned int vlen)
 {
+  int e = errno ;
   ssize_t r ;
   do r = writev(fd, v, vlen) ;
-  while ((r == -1) && (errno == EINTR)) ;
+  while (r == -1 && errno == EINTR) ;
+  if (r >= 0) errno = e ;
   return r ;
 }