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author | Vadim Lobanov <vlobanov@speakeasy.net> | 2005-10-30 15:02:18 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 17:37:19 -0800 |
commit | 6dd69f1061bfdeca230509b173438e0731bff767 (patch) | |
tree | 66094a2fdf02fd808b0661cc2a26c6ff64d1c590 /kernel/signal.c | |
parent | 19a4fcb531659f2f7d18b5d04cee039176e9540d (diff) | |
download | linux-stable-6dd69f1061bfdeca230509b173438e0731bff767.tar.gz linux-stable-6dd69f1061bfdeca230509b173438e0731bff767.tar.bz2 linux-stable-6dd69f1061bfdeca230509b173438e0731bff767.zip |
[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>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r-- | kernel/signal.c | 71 |
1 files changed, 25 insertions, 46 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 8d6e64dfa5c6..1d905ec74bde 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2283,26 +2283,13 @@ sys_kill(int pid, int sig) return kill_something_info(sig, &info, pid); } -/** - * sys_tgkill - send signal to one specific thread - * @tgid: the thread group ID of the thread - * @pid: the PID of the thread - * @sig: signal to be sent - * - * This syscall also checks the tgid and returns -ESRCH even if the PID - * exists but it's not belonging to the target process anymore. This - * method solves the problem of threads exiting and PIDs getting reused. - */ -asmlinkage long sys_tgkill(int tgid, int pid, int sig) +static int do_tkill(int tgid, int pid, int sig) { - struct siginfo info; int error; + struct siginfo info; struct task_struct *p; - /* This is only valid for single tasks */ - if (pid <= 0 || tgid <= 0) - return -EINVAL; - + error = -ESRCH; info.si_signo = sig; info.si_errno = 0; info.si_code = SI_TKILL; @@ -2311,8 +2298,7 @@ asmlinkage long sys_tgkill(int tgid, int pid, int sig) read_lock(&tasklist_lock); p = find_task_by_pid(pid); - error = -ESRCH; - if (p && (p->tgid == tgid)) { + if (p && (tgid <= 0 || p->tgid == tgid)) { error = check_kill_permission(sig, &info, p); /* * The null signal is a permissions and process existence @@ -2326,47 +2312,40 @@ asmlinkage long sys_tgkill(int tgid, int pid, int sig) } } read_unlock(&tasklist_lock); + return error; } +/** + * sys_tgkill - send signal to one specific thread + * @tgid: the thread group ID of the thread + * @pid: the PID of the thread + * @sig: signal to be sent + * + * This syscall also checks the tgid and returns -ESRCH even if the PID + * exists but it's not belonging to the target process anymore. This + * method solves the problem of threads exiting and PIDs getting reused. + */ +asmlinkage long sys_tgkill(int tgid, int pid, int sig) +{ + /* This is only valid for single tasks */ + if (pid <= 0 || tgid <= 0) + return -EINVAL; + + return do_tkill(tgid, pid, sig); +} + /* * Send a signal to only one task, even if it's a CLONE_THREAD task. */ asmlinkage long sys_tkill(int pid, int sig) { - struct siginfo info; - int error; - struct task_struct *p; - /* This is only valid for single tasks */ if (pid <= 0) return -EINVAL; - 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); - 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; + return do_tkill(0, pid, sig); } asmlinkage long |