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libc: rewrite access()

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This commit is contained in:
Giacomo Tesio 2016-12-26 00:35:40 +01:00
parent b862596737
commit 66373243bd
2 changed files with 20 additions and 18 deletions
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1
sys/include/libc.h
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@ -572,6 +572,7 @@ extern void freenetconninfo(NetConnInfo*);
#define AREAD 4 /* read access */ #define AREAD 4 /* read access */
#define AWRITE 2 /* write access */ #define AWRITE 2 /* write access */
#define AEXEC 1 /* execute access */ #define AEXEC 1 /* execute access */
#define AMASK (AEXIST|AREAD|AWRITE|AEXEC)
/* Segattch */ /* Segattch */
#define SG_RONLY 0040 /* read only */ #define SG_RONLY 0040 /* read only */

37
sys/src/lib/c/9sys/access.c
View File

@ -1,10 +1,19 @@
/* /*
* This file is part of the UCB release of Plan 9. It is subject to the license * This file is part of Jehanne.
* terms in the LICENSE file found in the top-level directory of this *
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * Copyright (C) 2016 Giacomo Tesio <giacomo@tesio.it>
* part of the UCB release of Plan 9, including this file, may be copied, *
* modified, propagated, or distributed except according to the terms contained * Jehanne is free software: you can redistribute it and/or modify
* in the LICENSE file. * it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 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 General Public License
* along with Jehanne. If not, see <http://www.gnu.org/licenses/>.
*/ */
#include <u.h> #include <u.h>
@ -14,27 +23,19 @@ int
access(const char *name, int mode) access(const char *name, int mode)
{ {
int fd; int fd;
Dir *db;
static char omode[] = { static char omode[] = {
0, OSTAT,
OEXEC, OEXEC,
OWRITE, OWRITE,
ORDWR, ORDWR,
OREAD, OREAD,
OEXEC, /* only approximate */ OEXEC, /* 5=4+1 READ|EXEC, EXEC is enough */
ORDWR, ORDWR,
ORDWR /* only approximate */ ORDWR /* 7=4+2+1 READ|WRITE|EXEC, ignore EXEC */
}; };
if(mode == AEXIST){ fd = open(name, omode[mode&AMASK]);
db = dirstat(name);
free(db);
if(db != nil)
return 0;
return -1;
}
fd = open(name, omode[mode&7]);
if(fd >= 0){ if(fd >= 0){
close(fd); close(fd);
return 0; return 0;