diff options
| -rw-r--r-- | sys/include/sys/sysctl.h | 1 | ||||
| -rw-r--r-- | sys/kern/kern_sysctl.c | 27 |
2 files changed, 28 insertions, 0 deletions
diff --git a/sys/include/sys/sysctl.h b/sys/include/sys/sysctl.h index d13b0f8..d258860 100644 --- a/sys/include/sys/sysctl.h +++ b/sys/include/sys/sysctl.h @@ -64,6 +64,7 @@ struct sysctl_entry { }; scret_t sys_sysctl(struct syscall_args *scargs); +int sysctl_clearstr(int name); #endif /* _KERNEL */ /* diff --git a/sys/kern/kern_sysctl.c b/sys/kern/kern_sysctl.c index 7679aa1..f5d8bdc 100644 --- a/sys/kern/kern_sysctl.c +++ b/sys/kern/kern_sysctl.c @@ -154,6 +154,33 @@ done: return retval; } +/* + * Clear a writable sysctl string variable to the + * value of "(undef)" + * + * @name: Name to clear + */ +int +sysctl_clearstr(int name) +{ + struct sysctl_args args; + char val[] = "(undef)"; + int error; + + args.name = &name; + args.nlen = 1; + args.oldlenp = 0; + args.oldp = NULL; + args.newp = val; + args.newlen = sizeof(val); + + if ((error = sysctl(&args)) != 0) { + return error; + } + + return 0; +} + int sysctl(struct sysctl_args *args) { |