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Provide euidaccess, canonicalize_file_name; fix fchmodat.

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* syscalls.cc (fchmodat): lchmod is not yet implemented.
(euidaccess): New function.
* path.cc (realpath): Update comment.
(canonicalize_file_name): New function.
* include/cygwin/stdlib.h (canonicalize_file_name): Declare it.
* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
* cygwin.din: Export canonicalize_file_name, eaccess, euidaccess.
* posix.sgml: Mention them.
This commit is contained in:
Eric Blake
2009-09-25 23:55:00 +00:00
parent 358d4e3cb0
commit 2bf78f0928
7 changed files with 65 additions and 12 deletions
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24
winsup/cygwin/path.cc
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@ -2845,7 +2845,7 @@ cygwin_conv_to_full_posix_path (const char *path, char *posix_path)
MAX_PATH);
}
/* The realpath function is supported on some UNIX systems. */
/* The realpath function is required by POSIX:2008. */
extern "C" char *
realpath (const char *path, char *resolved)
@ -2876,11 +2876,9 @@ realpath (const char *path, char *resolved)
path_conv real_path (tpath, PC_SYM_FOLLOW | PC_POSIX, stat_suffixes);
/* Linux has this funny non-standard extension. If "resolved" is NULL,
realpath mallocs the space by itself and returns it to the application.
The application is responsible for calling free() then. This extension
is backed by POSIX, which allows implementation-defined behaviour if
"resolved" is NULL. That's good enough for us to do the same here. */
/* POSIX 2008 requires malloc'ing if resolved is NULL, and states
that using non-NULL resolved is asking for portability
problems. */
if (!real_path.error && real_path.exists ())
{
@ -2894,14 +2892,24 @@ realpath (const char *path, char *resolved)
return resolved;
}
/* FIXME: on error, we are supposed to put the name of the path
component which could not be resolved into RESOLVED. */
/* FIXME: on error, Linux puts the name of the path
component which could not be resolved into RESOLVED, but POSIX
does not require this. */
if (resolved)
resolved[0] = '\0';
set_errno (real_path.error ?: ENOENT);
return NULL;
}
/* Linux provides this extension. Since the only portable use of
realpath requires a NULL second argument, we might as well have a
one-argument wrapper. */
extern "C" char *
canonicalize_file_name (const char *path)
{
return realpath (path, NULL);
}
/* Return non-zero if path is a POSIX path list.
This is exported to the world as cygwin_foo by cygwin.din.