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Cygwin: Move O_TMPFILE to bin and allow linkat by handle

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Along the same lines as the previous patch: By reopening an
O_TMPFILE by handle, we can now move the file to the bin at
open time and thus free'ing up the parent dir and *still*
open the file as /proc/PID/fd/DESCRIPTOR by linkat(2).
This commit is contained in:
Corinna Vinschen
2019-01-05 22:15:58 +01:00
parent a1a750325e
commit 7dbe307e38
3 changed files with 90 additions and 1 deletions
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8
winsup/cygwin/syscalls.cc
View File

@ -1484,6 +1484,10 @@ open (const char *unix_path, int flags, ...)
else if ((fh->is_fs_special () && fh->device_access_denied (flags))
|| !fh->open_with_arch (flags, mode & 07777))
__leave; /* errno already set */
/* Move O_TMPFILEs to the bin to avoid blocking the parent dir. */
if ((flags & O_TMPFILE) && !fh->pc.isremote ())
try_to_bin (fh->pc, fh->get_handle (), DELETE,
FILE_OPEN_FOR_BACKUP_INTENT);
fd = fh;
if (fd <= 2)
set_std_handle (fd);
@ -4791,7 +4795,9 @@ linkat (int olddirfd, const char *oldpathname,
__leave;
if (flags & AT_SYMLINK_FOLLOW)
{
path_conv old_name (oldpath, PC_SYM_FOLLOW | PC_POSIX, stat_suffixes);
path_conv old_name (oldpath,
PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_PROCFD | PC_POSIX,
stat_suffixes);
if (old_name.error)
{
set_errno (old_name.error);