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Make searching for files faster under Windows

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* src/lread.c (openp): Use faccessat to check that a file exists
before opening it on Windows (bug#41646).  This speeds up
searching for files.
This commit is contained in:
Nicolás Bértolo 2021-05-13 13:30:29 +02:00 • committed by Lars Ingebrigtsen
parent 1af91d271e
commit 0e69c85d7d
1 changed files with 11 additions and 1 deletions
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12
src/lread.c
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@ -1945,7 +1945,17 @@ openp (Lisp_Object path, Lisp_Object str, Lisp_Object suffixes,
}
else
{
fd = emacs_open (pfn, O_RDONLY, 0);
/* In some systems (like Windows) finding out if a
file exists is cheaper to do than actually opening
it. Only open the file when we are sure that it
exists. */
#ifdef WINDOWSNT
if (faccessat (AT_FDCWD, pfn, R_OK, AT_EACCESS))
fd = -1;
else
#endif
fd = emacs_open (pfn, O_RDONLY, 0);
if (fd < 0)
{
if (! (errno == ENOENT || errno == ENOTDIR))