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Diffstat (limited to 'manual/signal.texi')
| -rw-r--r-- | manual/signal.texi | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/manual/signal.texi b/manual/signal.texi index 8b3a52e22a..33e6646975 100644 --- a/manual/signal.texi +++ b/manual/signal.texi @@ -2291,6 +2291,21 @@ The @var{pid} argument does not refer to an existing process or group. @end table @end deftypefun +@deftypefun int tgkill (pid_t @var{pid}, pid_t @var{tid}, int @var{signum}) +@standards{Linux, signal.h} +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} +The @code{tgkill} function sends the signal @var{signum} to the thread +or process with ID @var{tid}, like the @code{kill} function, but only +if the process ID of the thread @var{tid} is equal to @var{pid}. If +the target thread belongs to another process, the function fails with +@code{ESRCH}. + +The @code{tgkill} function can be used to avoid sending a signal to a +thread in the wrong process if the caller ensures that the passed +@var{pid} value is not reused by the kernel (for example, if it is the +process ID of the current process, as returned by @code{getpid}). +@end deftypefun + @deftypefun int killpg (int @var{pgid}, int @var{signum}) @standards{BSD, signal.h} @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} |