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| author | kib <kib@FreeBSD.org> | 2012-08-15 15:56:21 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2012-08-15 15:56:21 +0000 |
| commit | 604f552e40a9a201162d6c070fd96bc504b30ff3 (patch) | |
| tree | a9682200639371dd135caf82e8d5130aa117d0c2 /sys/kern/kern_mib.c | |
| parent | ba66fb6ab507c9347d6b74704834eddfad52ed48 (diff) | |
| download | FreeBSD-src-604f552e40a9a201162d6c070fd96bc504b30ff3.zip FreeBSD-src-604f552e40a9a201162d6c070fd96bc504b30ff3.tar.gz | |
Add a sysctl kern.pid_max, which limits the maximum pid the system is
allowed to allocate, and corresponding tunable with the same
name. Note that existing processes with higher pids are left intact.
MFC after: 1 week
Diffstat (limited to 'sys/kern/kern_mib.c')
| -rw-r--r-- | sys/kern/kern_mib.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sys/kern/kern_mib.c b/sys/kern/kern_mib.c index 75b3af9..f6ab3a4 100644 --- a/sys/kern/kern_mib.c +++ b/sys/kern/kern_mib.c @@ -499,6 +499,30 @@ SYSCTL_INT(_debug_sizeof, OID_AUTO, vnode, CTLFLAG_RD, SYSCTL_INT(_debug_sizeof, OID_AUTO, proc, CTLFLAG_RD, 0, sizeof(struct proc), "sizeof(struct proc)"); +static int +sysctl_kern_pid_max(SYSCTL_HANDLER_ARGS) +{ + int error, pm; + + pm = pid_max; + error = sysctl_handle_int(oidp, &pm, 0, req); + if (error || !req->newptr) + return (error); + sx_xlock(&proctree_lock); + sx_xlock(&allproc_lock); + /* Only permit the values less then PID_MAX. */ + if (pm > PID_MAX) + error = EINVAL; + else + pid_max = pm; + sx_xunlock(&allproc_lock); + sx_xunlock(&proctree_lock); + return (error); +} +SYSCTL_PROC(_kern, OID_AUTO, pid_max, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_TUN | + CTLFLAG_MPSAFE, 0, 0, sysctl_kern_pid_max, "I", + "Maximum allowed pid"); + #include <sys/bio.h> #include <sys/buf.h> SYSCTL_INT(_debug_sizeof, OID_AUTO, bio, CTLFLAG_RD, |
