A few more minor file errno-reporting bugs.

* callproc.c (Fcall_process):
* doc.c (Fsnarf_documentation):
* fileio.c (Frename_file, Fadd_name_to_file, Fmake_symbolic_link):
* process.c (set_socket_option):
Don't let a constructor trash errno.
* doc.c: Include <errno.h>.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/doc.c b/src/doc.c
index 92c7b2c6dc9..168af6da94a 100644
--- a/src/doc.c
+++ b/src/doc.c
@@ -21,6 +21,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
+#include <errno.h>
 #include <sys/types.h>
 #include <sys/file.h>   /* Must be after sys/types.h for USG.  */
 #include <fcntl.h>
@@ -609,7 +610,11 @@ the same file name is found in the `doc-directory'.  */)
 
   fd = emacs_open (name, O_RDONLY, 0);
   if (fd < 0)
-    report_file_error ("Opening doc string file", build_string (name));
+    {
+      int open_errno = errno;
+      report_file_errno ("Opening doc string file", build_string (name),
+                         open_errno);
+    }
   Vdoc_file_name = filename;
   filled = 0;
   pos = 0;