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 * $FreeBSD$ 10 * 11 */ 12 #include <sys/types.h> 13 #include <sys/sysctl.h> 14 #include <string.h> 15 16 int 17 sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, 18 size_t newlen) 19 { 20 int name2oid_oid[2]; 21 int real_oid[CTL_MAXNAME+2]; 22 int error; 23 size_t oidlen; 24 25 name2oid_oid[0] = 0; /* This is magic & undocumented! */ 26 name2oid_oid[1] = 3; 27 28 oidlen = sizeof(real_oid); 29 error = sysctl(name2oid_oid, 2, real_oid, &oidlen, (void *)name, 30 strlen(name)); 31 if (error < 0) 32 return error; 33 oidlen /= sizeof (int); 34 error = sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen); 35 return (error); 36 } 37 38