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[PATCH] Unify sys_tkill() and sys_tgkill() 

The majority of the sys_tkill() and sys_tgkill() function code is
duplicated between the two of them.  This patch pulls the duplication out
into a separate function -- do_tkill() -- and lets sys_tkill() and
sys_tgkill() be simple wrappers around it.  This should make it easier to
maintain in light of future changes.

Signed-off-by: Vadim Lobanov <vlobanov@speakeasy.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vadim Lobanov 2005-10-30 15:02:18 -08:00 committed by Linus Torvalds
parent 19a4fcb531
commit 6dd69f1061
1 changed files with 35 additions and 56 deletions
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91
kernel/signal.c
View File

@ -2283,6 +2283,39 @@ sys_kill(int pid, int sig)
return kill_something_info(sig, &info, pid); return kill_something_info(sig, &info, pid);
} }
static int do_tkill(int tgid, int pid, int sig)
{
int error;
struct siginfo info;
struct task_struct *p;
error = -ESRCH;
info.si_signo = sig;
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = current->tgid;
info.si_uid = current->uid;
read_lock(&tasklist_lock);
p = find_task_by_pid(pid);
if (p && (tgid <= 0 || p->tgid == tgid)) {
error = check_kill_permission(sig, &info, p);
/*
* The null signal is a permissions and process existence
* probe. No signal is actually delivered.
*/
if (!error && sig && p->sighand) {
spin_lock_irq(&p->sighand->siglock);
handle_stop_signal(sig, p);
error = specific_send_sig_info(sig, &info, p);
spin_unlock_irq(&p->sighand->siglock);
}
}
read_unlock(&tasklist_lock);
return error;
}
/** /**
* sys_tgkill - send signal to one specific thread * sys_tgkill - send signal to one specific thread
* @tgid: the thread group ID of the thread * @tgid: the thread group ID of the thread
@ -2295,38 +2328,11 @@ sys_kill(int pid, int sig)
*/ */
asmlinkage long sys_tgkill(int tgid, int pid, int sig) asmlinkage long sys_tgkill(int tgid, int pid, int sig)
{ {
struct siginfo info;
int error;
struct task_struct *p;
/* This is only valid for single tasks */ /* This is only valid for single tasks */
if (pid <= 0 || tgid <= 0) if (pid <= 0 || tgid <= 0)
return -EINVAL; return -EINVAL;
info.si_signo = sig; return do_tkill(tgid, pid, sig);
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = current->tgid;
info.si_uid = current->uid;
read_lock(&tasklist_lock);
p = find_task_by_pid(pid);
error = -ESRCH;
if (p && (p->tgid == tgid)) {
error = check_kill_permission(sig, &info, p);
/*
* The null signal is a permissions and process existence
* probe. No signal is actually delivered.
*/
if (!error && sig && p->sighand) {
spin_lock_irq(&p->sighand->siglock);
handle_stop_signal(sig, p);
error = specific_send_sig_info(sig, &info, p);
spin_unlock_irq(&p->sighand->siglock);
}
}
read_unlock(&tasklist_lock);
return error;
} }
/* /*
@ -2335,38 +2341,11 @@ asmlinkage long sys_tgkill(int tgid, int pid, int sig)
asmlinkage long asmlinkage long
sys_tkill(int pid, int sig) sys_tkill(int pid, int sig)
{ {
struct siginfo info;
int error;
struct task_struct *p;
/* This is only valid for single tasks */ /* This is only valid for single tasks */
if (pid <= 0) if (pid <= 0)
return -EINVAL; return -EINVAL;
info.si_signo = sig; return do_tkill(0, pid, sig);
info.si_errno = 0;
info.si_code = SI_TKILL;
info.si_pid = current->tgid;
info.si_uid = current->uid;
read_lock(&tasklist_lock);
p = find_task_by_pid(pid);
error = -ESRCH;
if (p) {
error = check_kill_permission(sig, &info, p);
/*
* The null signal is a permissions and process existence
* probe. No signal is actually delivered.
*/
if (!error && sig && p->sighand) {
spin_lock_irq(&p->sighand->siglock);
handle_stop_signal(sig, p);
error = specific_send_sig_info(sig, &info, p);
spin_unlock_irq(&p->sighand->siglock);
}
}
read_unlock(&tasklist_lock);
return error;
} }
asmlinkage long asmlinkage long