Commit 94344d13 authored by Philipp Stephani's avatar Philipp Stephani

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.
parent c7c154bb
......@@ -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));
}
......
......@@ -1336,7 +1336,7 @@ emacs_spawn (pid_t *newpid, int std_in, int std_out, int std_err,
would work? */
if (std_in >= 0)
emacs_close (std_in);
std_out = std_in = emacs_open (pty, O_RDWR, 0);
std_out = std_in = emacs_open_noquit (pty, O_RDWR, 0);
if (std_in < 0)
{
......
......@@ -1275,7 +1275,7 @@ main (int argc, char **argv)
{
emacs_close (STDIN_FILENO);
emacs_close (STDOUT_FILENO);
int result = emacs_open (term, O_RDWR, 0);
int result = emacs_open_noquit (term, O_RDWR, 0);
if (result != STDIN_FILENO
|| (fcntl (STDIN_FILENO, F_DUPFD_CLOEXEC, STDOUT_FILENO)
!= STDOUT_FILENO))
......@@ -2847,7 +2847,7 @@ from the parent process and its tty file descriptors. */)
int nfd;
/* Get rid of stdin, stdout and stderr. */
nfd = emacs_open ("/dev/null", O_RDWR, 0);
nfd = emacs_open_noquit ("/dev/null", O_RDWR, 0);
err |= nfd < 0;
err |= dup2 (nfd, STDIN_FILENO) < 0;
err |= dup2 (nfd, STDOUT_FILENO) < 0;
......
......@@ -4577,6 +4577,7 @@ extern AVOID emacs_abort (void) NO_INLINE;
extern int emacs_fstatat (int, char const *, void *, int);
extern int emacs_openat (int, char const *, int, int);
extern int emacs_open (const char *, int, int);
extern int emacs_open_noquit (const char *, int, int);
extern int emacs_pipe (int[2]);
extern int emacs_close (int);
extern ptrdiff_t emacs_read (int, void *, ptrdiff_t);
......
......@@ -5273,7 +5273,7 @@ pdumper_load (const char *dump_filename)
eassert (!dump_loaded_p ());
int err;
int dump_fd = emacs_open (dump_filename, O_RDONLY, 0);
int dump_fd = emacs_open_noquit (dump_filename, O_RDONLY, 0);
if (dump_fd < 0)
{
err = (errno == ENOENT || errno == ENOTDIR
......
......@@ -2320,6 +2320,28 @@ emacs_open (char const *file, int oflags, int mode)
return emacs_openat (AT_FDCWD, file, oflags, mode);
}
/* Same as above, but doesn't allow the user to quit. */
static int
emacs_openat_noquit (int dirfd, const char *file, int oflags,
int mode)
{
int fd;
if (! (oflags & O_TEXT))
oflags |= O_BINARY;
oflags |= O_CLOEXEC;
do
fd = openat (dirfd, file, oflags, mode);
while (fd < 0 && errno == EINTR);
return fd;
}
int
emacs_open_noquit (char const *file, int oflags, int mode)
{
return emacs_openat_noquit (AT_FDCWD, file, oflags, mode);
}
/* Open FILE as a stream for Emacs use, with mode MODE.
Act like emacs_open with respect to threads, signals, and quits. */
......
......@@ -7507,7 +7507,8 @@ w32_initialize (void)
}
#ifdef CYGWIN
if ((w32_message_fd = emacs_open ("/dev/windows", O_RDWR, 0)) == -1)
if ((w32_message_fd = emacs_open_noquit ("/dev/windows", O_RDWR, 0))
== -1)
fatal ("opening /dev/windows: %s", strerror (errno));
#endif /* CYGWIN */
......
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