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libposix: add readlink and readlinkat (both failing with EINVAL)

This commit is contained in:
Giacomo Tesio 2017-09-03 23:46:18 +02:00
parent c5aaa72bbb
commit 4be2181f89
3 changed files with 75 additions and 38 deletions
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1
sys/src/lib/posix/build.json
View File

@ -14,6 +14,7 @@
"errors.c",
"files.c",
"initlib.c",
"links.c",
"memory.c",
"others.c",
"processes.c",

38
sys/src/lib/posix/files.c
View File

@ -357,31 +357,6 @@ POSIX_close(int *errno, int file)
return -1;
}
int
POSIX_link(int *errnop, const char *old, const char *new)
{
int err;
/* let choose the most appropriate error */
if(old == nil || new == nil || old[0] == 0 || new[0] == 0)
err = __libposix_get_errno(PosixENOENT);
else if(access(new, AEXIST) == 0)
err = __libposix_get_errno(PosixEEXIST);
else if(access(old, AEXIST) == 0)
err = __libposix_get_errno(PosixENOENT);
else {
/* Jehanne does not support links.
* A custom overlay filesystem might support them in
* the future but so far it does not exists yet.
*
* We return EXDEV so that a posix compliant caller
* can fallback to a simple copy.
*/
err = __libposix_get_errno(PosixEXDEV);
}
*errnop = err;
return -1;
}
int
POSIX_unlink(int *errnop, const char *name)
{
@ -459,12 +434,6 @@ POSIX_stat(int *errnop, const char *file, void *pstat)
return -1;
}
int
POSIX_lstat(int *errnop, const char *file, void *pstat)
{
return POSIX_stat(errnop, file, pstat);
}
int
POSIX_chmod(int *errnop, const char *path, int mode)
{
@ -581,13 +550,6 @@ POSIX_fchownat(int *errnop, int fd, const char *path, int owner, int group, int
return 0;
}
int
POSIX_lchown(int *errnop, const char *path, int owner, int group)
{
/* TODO: implement when actually needed */
return 0;
}
int
POSIX_chdir(int *errnop, const char *path)
{

74
sys/src/lib/posix/links.c Normal file
View File

@ -0,0 +1,74 @@
/*
* This file is part of Jehanne.
*
* Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
*
* This is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, version 3 of the License.
*
* Jehanne is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
*/
#include <u.h>
#include <lib9.h>
#include <9P2000.h>
#include <posix.h>
#include "internal.h"
int
POSIX_lchown(int *errnop, const char *path, int owner, int group)
{
/* TODO: implement when actually needed */
return 0;
}
int
POSIX_link(int *errnop, const char *old, const char *new)
{
int err;
/* let choose the most appropriate error */
if(old == nil || new == nil || old[0] == 0 || new[0] == 0)
err = __libposix_get_errno(PosixENOENT);
else if(access(new, AEXIST) == 0)
err = __libposix_get_errno(PosixEEXIST);
else if(access(old, AEXIST) == 0)
err = __libposix_get_errno(PosixENOENT);
else {
/* Jehanne does not support links.
* A custom overlay filesystem might support them in
* the future but so far it does not exists yet.
*
* We return EXDEV so that a posix compliant caller
* can fallback to a simple copy.
*/
err = __libposix_get_errno(PosixEXDEV);
}
*errnop = err;
return -1;
}
int
POSIX_lstat(int *errnop, const char *file, void *pstat)
{
return POSIX_stat(errnop, file, pstat);
}
int
POSIX_readlink(int *errnop, const char *path, char *buf, int bufsize)
{
*errnop = __libposix_get_errno(PosixEINVAL);
return -1;
}
int
POSIX_readlinkat(int *errnop, int fd, const char *path, char *buf, int bufsize)
{
*errnop = __libposix_get_errno(PosixEINVAL);
return -1;
}