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Cygwin: linkat: support Linux-specific AT_EMPTY_PATH flag 

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2019-01-07 19:36:37 +01:00
parent b93022a82d
commit 9443efe099
4 changed files with 25 additions and 2 deletions
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1
newlib/libc/include/sys/_default_fcntl.h
View File

@ -166,6 +166,7 @@ extern "C" {
#define AT_SYMLINK_NOFOLLOW 2 #define AT_SYMLINK_NOFOLLOW 2
#define AT_SYMLINK_FOLLOW 4 #define AT_SYMLINK_FOLLOW 4
#define AT_REMOVEDIR 8 #define AT_REMOVEDIR 8
#define AT_EMPTY_PATH 16
#endif #endif
#if __BSD_VISIBLE #if __BSD_VISIBLE

2
winsup/cygwin/release/2.12.0
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@ -22,6 +22,8 @@ What's new:
- Support Linux-specific open(2) flag O_PATH. - Support Linux-specific open(2) flag O_PATH.
- Support Linux-specific linkat(2) flag AT_EMPTY_PATH.
What changed: What changed:
------------- -------------

20
winsup/cygwin/syscalls.cc
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@ -4812,13 +4812,29 @@ linkat (int olddirfd, const char *oldpathname,
tmp_pathbuf tp; tmp_pathbuf tp;
__try __try
{ {
if (flags & ~AT_SYMLINK_FOLLOW) if (flags & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH))
{ {
set_errno (EINVAL); set_errno (EINVAL);
__leave; __leave;
} }
char *oldpath = tp.c_get (); char *oldpath = tp.c_get ();
if (gen_full_path_at (oldpath, olddirfd, oldpathname)) /* AT_EMPTY_PATH with an empty oldpathname is equivalent to
linkat(AT_FDCWD, "/proc/self/fd/<olddirfd>", newdirfd,
newname, AT_SYMLINK_FOLLOW);
Convert the request accordingly. */
if ((flags & AT_EMPTY_PATH) && oldpathname && oldpathname[0] == '\0')
{
if (olddirfd == AT_FDCWD)
{
set_errno (EPERM);
__leave;
}
__small_sprintf (oldpath, "/proc/%d/fd/%d", myself->pid, olddirfd);
flags = AT_SYMLINK_FOLLOW;
}
else if (gen_full_path_at (oldpath, olddirfd, oldpathname))
__leave; __leave;
char *newpath = tp.c_get (); char *newpath = tp.c_get ();
if (gen_full_path_at (newpath, newdirfd, newpathname)) if (gen_full_path_at (newpath, newdirfd, newpathname))

4
winsup/doc/new-features.xml
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@ -41,6 +41,10 @@ Support for exFAT.
Support Linux-specific open(2) flag O_PATH. Support Linux-specific open(2) flag O_PATH.
</para></listitem> </para></listitem>
<listitem><para>
- Support Linux-specific linkat(2) flag AT_EMPTY_PATH.
</para></listitem>
<listitem><para> <listitem><para>
clock_nanosleep, pthread_condattr_setclock and timer_create now support clock_nanosleep, pthread_condattr_setclock and timer_create now support
all clocks, except CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID. all clocks, except CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID.