Add functions to open a file without quitting.

In some situations, e.g. when the Lisp machinery isn't available, we
can't quit.  Don't check the quit flags in such situations, in case
they contain garbage.

* src/sysdep.c (emacs_open_noquit, emacs_openat_noquit): New variants
of 'emacs_open' and 'emacs_openat' that don't check the quit flags.

* src/emacs.c (main, Fdaemon_initialized):
* src/pdumper.c (pdumper_load):
* src/w32term.c (w32_initialize):
* src/buffer.c (mmap_init):
* src/callproc.c (emacs_spawn): Use them where we can't quit.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 71ad5edd527..80c799e719b 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -4785,7 +4785,7 @@ mmap_init (void)
   if (mmap_fd <= 0)
     {
       /* No anonymous mmap -- we need the file descriptor.  */
-      mmap_fd = emacs_open ("/dev/zero", O_RDONLY, 0);
+      mmap_fd = emacs_open_noquit ("/dev/zero", O_RDONLY, 0);
       if (mmap_fd == -1)
         fatal ("Cannot open /dev/zero: %s", emacs_strerror (errno));
     }