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g_file_set_contents(): use unistd instead of stdio

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Use a normal write() system call instead of fdopen() and fwrite().

This will definitely work on UNIX system and should work on Windows as
well...

As an added bonus, we can use g_close() now as well.

https://bugzilla.gnome.org/show_bug.cgi?id=701560
This commit is contained in:
Ryan Lortie
2013-06-03 17:49:06 -04:00
parent c152ceba09
commit e40435e834
1 changed files with 19 additions and 33 deletions
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66
glib/gfileutils.c
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@@ -1033,7 +1033,6 @@ write_to_temp_file (const gchar *contents,
{
gchar *tmp_name;
gchar *retval;
FILE *file;
gint fd;
retval = NULL;
@@ -1049,49 +1048,37 @@ write_to_temp_file (const gchar *contents,
goto out;
}
errno = 0;
file = fdopen (fd, "wb");
if (!file)
#ifdef HAVE_POSIX_FALLOCATE
if (length > 0)
{
format_error_message (err, tmp_name, _("Failed to open file '%s' for writing: fdopen() failed: %s"));
/* We do this on a 'best effort' basis... It may not be supported
* on the underlying filesystem.
*/
(void) posix_fallocate (fd, 0, length);
}
#endif
while (length > 0)
{
gssize s;
s = write (fd, contents, length);
if (s < 0)
{
if (errno == EINTR)
continue;
format_error_message (err, tmp_name, _("Failed to write file '%s': write() failed: %s"));
close (fd);
g_unlink (tmp_name);
goto out;
}
if (length > 0)
{
gsize n_written;
g_assert (s <= length);
#ifdef HAVE_POSIX_FALLOCATE
/* We do this on a 'best effort' basis... It may not be supported
* on the underlying filesystem.
*/
(void) posix_fallocate (fd, 0, length);
#endif
errno = 0;
n_written = fwrite (contents, 1, length, file);
if (n_written < length)
{
format_error_message (err, tmp_name, _("Failed to write file '%s': fwrite() failed: %s"));
fclose (file);
g_unlink (tmp_name);
goto out;
}
}
errno = 0;
if (fflush (file) != 0)
{
format_error_message (err, tmp_name, _("Failed to write file '%s': fflush() failed: %s"));
fclose (file);
g_unlink (tmp_name);
goto out;
contents += s;
length -= s;
}
#ifdef BTRFS_SUPER_MAGIC
@@ -1119,10 +1106,10 @@ write_to_temp_file (const gchar *contents,
* the new and the old file on some filesystems. (I.E. those that don't
* guarantee the data is written to the disk before the metadata.)
*/
if (g_lstat (dest_file, &statbuf) == 0 && statbuf.st_size > 0 && fsync (fileno (file)) != 0)
if (g_lstat (dest_file, &statbuf) == 0 && statbuf.st_size > 0 && fsync (fd) != 0)
{
format_error_message (err, tmp_name, _("Failed to write file '%s': fsync() failed: %s"));
fclose (file);
close (fd);
g_unlink (tmp_name);
goto out;
@@ -1135,9 +1122,8 @@ write_to_temp_file (const gchar *contents,
#endif
errno = 0;
if (fclose (file) == EOF)
if (g_close (fd, err))
{
format_error_message (err, tmp_name, _("Failed to close file '%s': fclose() failed: %s"));
g_unlink (tmp_name);
goto out;