1 /* 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * $FreeBSD: src/lib/libc/gen/sysctlbyname.c,v 1.4 1999/08/27 23:59:01 peter Exp $ 10 * $DragonFly: src/lib/libc/gen/sysctlbyname.c,v 1.2 2003/06/17 04:26:42 dillon Exp $ 11 * 12 */ 13 #include <sys/types.h> 14 #include <sys/sysctl.h> 15 #include <string.h> 16 17 int 18 sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, 19 size_t newlen) 20 { 21 int name2oid_oid[2]; 22 int real_oid[CTL_MAXNAME+2]; 23 int error; 24 size_t oidlen; 25 26 name2oid_oid[0] = 0; /* This is magic & undocumented! */ 27 name2oid_oid[1] = 3; 28 29 oidlen = sizeof(real_oid); 30 error = sysctl(name2oid_oid, 2, real_oid, &oidlen, (void *)name, 31 strlen(name)); 32 if (error < 0) 33 return error; 34 oidlen /= sizeof (int); 35 error = sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen); 36 return (error); 37 } 38 39