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 */ 10 11 #include <sys/cdefs.h> 12 __FBSDID("$FreeBSD$"); 13 14 #include <sys/types.h> 15 #include <sys/sysctl.h> 16 #include <string.h> 17 18 int 19 sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, 20 size_t newlen) 21 { 22 int name2oid_oid[2]; 23 int real_oid[CTL_MAXNAME+2]; 24 int error; 25 size_t oidlen; 26 27 name2oid_oid[0] = 0; /* This is magic & undocumented! */ 28 name2oid_oid[1] = 3; 29 30 oidlen = sizeof(real_oid); 31 error = sysctl(name2oid_oid, 2, real_oid, &oidlen, (void *)name, 32 strlen(name)); 33 if (error < 0) 34 return error; 35 oidlen /= sizeof (int); 36 error = sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen); 37 return (error); 38 } 39 40