diff options
Diffstat (limited to 'lib/libc/gen/sysctlbyname.c')
| -rw-r--r-- | lib/libc/gen/sysctlbyname.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/lib/libc/gen/sysctlbyname.c b/lib/libc/gen/sysctlbyname.c new file mode 100644 index 0000000..4510fe0 --- /dev/null +++ b/lib/libc/gen/sysctlbyname.c @@ -0,0 +1,39 @@ +/* + * ---------------------------------------------------------------------------- + * "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 + * ---------------------------------------------------------------------------- + * + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/sysctl.h> +#include <string.h> + +int +sysctlbyname(const char *name, void *oldp, size_t *oldlenp, void *newp, + size_t newlen) +{ + int name2oid_oid[2]; + int real_oid[CTL_MAXNAME+2]; + int error; + size_t 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, (void *)name, + strlen(name)); + if (error < 0) + return error; + oidlen /= sizeof (int); + error = sysctl(real_oid, oidlen, oldp, oldlenp, newp, newlen); + return (error); +} + |
