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posix: POSIX_sysconf

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This commit is contained in:
Giacomo Tesio 2019-11-18 00:40:53 +01:00
parent 49eb11173b
commit 49da4de25c
3 changed files with 78 additions and 0 deletions
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19
sys/include/posix.h
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@ -242,6 +242,24 @@ typedef enum PosixFDCmds
PosixFDCSetFL
} PosixFDCmds;
/* https://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html
*/
typedef enum PosixSysConfNames
{
/* Posix 1 */
PosixSCNArgMax = 1, // _SC_ARG_MAX
PosixSCNChildMax, // _SC_CHILD_MAX
PosixSCNHostNameMax, // _SC_HOST_NAME_MAX
PosixSCNLoginNameMax, // _SC_LOGIN_NAME_MAX
PosixSCNClockTicks, // _SC_CLK_TCK
PosixSCNOpenMax, // _SC_OPEN_MAX
PosixSCNPageSize, // _SC_PAGESIZE
PosixSCNPosixVersion, // _SC_VERSION
/* Posix 2 */
PosixSCNLineMax // _SC_LINE_MAX
} PosixSysConfNames;
#endif /* _LIBPOSIX_DEF */
#ifndef _LIBPOSIX_H
@ -305,6 +323,7 @@ extern unsigned int POSIX_sleep(unsigned int seconds);
extern int POSIX_pipe(int *errnop, int fildes[2]);
extern int POSIX_umask(int *errnop, int mask);
extern int POSIX_fcntl(int *errnop, int fd, PosixFDCmds cmd, uintptr_t arg);
extern long POSIX_sysconf(int *errnop, PosixSysConfNames name);
extern int POSIX_sigaddset(int *errnop, PosixSignalMask *set, int signo);
extern int POSIX_sigdelset(int *errnop, PosixSignalMask *set, int signo);

2
sys/src/lib/posix/build.json
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@ -1,6 +1,7 @@
{
"LibPosix": {
"Cflags": [
"-DPORTABLE_SYSCALLS",
"-DARCH=\"$ARCH\"",
"-fasm",
"-I."
@ -27,6 +28,7 @@
"sigqueue.c",
"sigsets.c",
"sigsuspend.c",
"sysconf.c",
"termios.c",
"timers.c"
]

57
sys/src/lib/posix/sysconf.c Normal file
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@ -0,0 +1,57 @@
/*
* This file is part of Jehanne.
*
* Copyright (C) 2019 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 <posix.h>
#include "internal.h"
long
POSIX_sysconf(int *errnop, PosixSysConfNames name)
{
/* "arbitrary" means that no actual limit exists */
switch(name){
case PosixSCNArgMax: // _SC_ARG_MAX
/* arbitrary */
return 4096;
case PosixSCNChildMax: // _SC_CHILD_MAX
/* arbitrary */
return 128;
case PosixSCNHostNameMax: // _SC_HOST_NAME_MAX
case PosixSCNLoginNameMax: // _SC_LOGIN_NAME_MAX
/* See Proc.genbuf in /sys/src/kern/port/portdat.h */
return 128;
case PosixSCNClockTicks: // _SC_CLK_TCK
/* See HZ in /sys/src/kern/amd64/dat.h */
return 100;
case PosixSCNOpenMax: // _SC_OPEN_MAX
/* arbitrary */
return 256;
case PosixSCNPageSize: // _SC_PAGESIZE
return 4096;
case PosixSCNPosixVersion: // _SC_VERSION
return 200101;
case PosixSCNLineMax: // _SC_LINE_MAX
/* arbitrary */
return 4096;
default:
*errnop = __libposix_get_errno(PosixENOSYS);
return -1;
}
}