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sysctlbyname allows acces to sysctl variables by name.

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The manpage has been sent to linquistic decontamination and will arrive
when released from the quarantine

Reviewed by:	peter
This commit is contained in:
Poul-Henning Kamp 1997-05-30 20:53:13 +00:00
parent 7e2a8bde3e
commit f3877f2e4e
2 changed files with 35 additions and 2 deletions
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4
lib/libc/gen/Makefile.inc
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@ -1,5 +1,5 @@
# @(#)Makefile.inc 8.6 (Berkeley) 5/4/95
# $Id: Makefile.inc,v 1.31 1997/04/13 15:12:14 davidn Exp $
# $Id: Makefile.inc,v 1.33 1997/05/03 03:49:54 jb Exp $
# machine-independent gen sources
.PATH: ${.CURDIR}/../libc/${MACHINE}/gen ${.CURDIR}/../libc/gen
@ -17,7 +17,7 @@ SRCS+= alarm.c assert.c clock.c closedir.c config.c confstr.c crypt.c \
scandir.c seekdir.c semconfig.c semctl.c semget.c semop.c \
setdomainname.c sethostname.c setjmperr.c setmode.c shmat.c \
shmctl.c shmdt.c shmget.c siginterrupt.c siglist.c signal.c \
sigsetops.c sleep.c sysconf.c sysctl.c syslog.c \
sigsetops.c sleep.c sysconf.c sysctl.c sysctlbyname.c syslog.c \
telldir.c termios.c time.c times.c timezone.c ttyname.c ttyslot.c \
ualarm.c uname.c unvis.c usleep.c utime.c valloc.c vis.c wait.c \
wait3.c waitpid.c

33
lib/libc/gen/sysctlbyname.c Normal file
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@ -0,0 +1,33 @@
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id$
*
*/
#include <sys/types.h>
#include <sys/sysctl.h>
int
sysctlbyname(char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen)
{
int name2oid_oid[2];
int real_oid[CTL_MAXNAME+2];
int error, oidlen;
name2oid_oid[0] = 0; /* This is magic & undocumented! */
name2oid_oid[1] = 3;
oidlen = sizeof(real_oid);
error = sysctl(name2oid_oid, 2, real_oid, &oidlen, name, strlen(name));
if (error < 0)
return error;
oidlen /= sizeof (int);
error = sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen);
return (error);
}