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| author | Paul Eggert <eggert@cs.ucla.edu> | 2017-08-02 01:53:46 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2017-08-02 01:59:32 -0700 |
| commit | 1f9f514e7c2ba41b0954d0141f99652f6a53a107 (patch) | |
| tree | 37d6a253a4db4b6ff2a46e9a7ac512cbe1938c71 /src/filelock.c | |
| parent | 5656492d04aa1a82747ff167d8063bbd7950597e (diff) | |
| download | emacs-1f9f514e7c2ba41b0954d0141f99652f6a53a107.tar.gz emacs-1f9f514e7c2ba41b0954d0141f99652f6a53a107.tar.bz2 emacs-1f9f514e7c2ba41b0954d0141f99652f6a53a107.zip | |
When renaming a file, ask only if EEXIST or ENOSYS
* src/fileio.c (Frename_file): Avoid calling Ffile_directory_p
more than once on FILE. Use renameat_noreplace, so that we can
ask the user (and unlink and retry) only if this fails with errno
== EEXIST or ENOSYS. This avoids the need to ask the user for
permission to do an operation that will fail anyway. Simplify
computation of ok_if_already_exists for subsidiary functions.
* src/filelock.c (rename_lock_file): Prefer renameat_noreplace
if it works, as this avoids the need to link and unlink.
* src/lisp.h (renameat_noreplace): New decl.
* src/sysdep.c [HAVE_LINUX_FS_H]: Include linux/fs.h and sys/syscall.h.
(renameat_noreplace): New function.
Diffstat (limited to 'src/filelock.c')
| -rw-r--r-- | src/filelock.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/filelock.c b/src/filelock.c index bfa1d63d833..dd8cb28c425 100644 --- a/src/filelock.c +++ b/src/filelock.c @@ -339,6 +339,9 @@ rename_lock_file (char const *old, char const *new, bool force) { struct stat st; + int r = renameat_noreplace (AT_FDCWD, old, AT_FDCWD, new); + if (! (r < 0 && errno == ENOSYS)) + return r; if (link (old, new) == 0) return unlink (old) == 0 || errno == ENOENT ? 0 : -1; if (errno != ENOSYS && errno != LINKS_MIGHT_NOT_WORK) |