Send a signal to a process or a group of processes
#include <sys/types.h> #include <signal.h> int kill( pid_t pid, int sig );
If pid is: | Then sig is sent to: |
---|---|
> 0 | The single process with that process ID |
0 | All processes that are in the same process group as the sending process |
-1 | (QNX Neutrino 7.0 or later) All processes (excluding those in session 1) for which the process has permission to send that signal |
< -1 | Every process that's a member of the process group -pid |
If the signal terminates a process, the cleanup of the terminated process occurs by default at the priority of the thread that sent the signal. As a QNX Neutrino extension, if you OR the SIG_TERMER_NOINHERIT flag (defined in <signal.h>) into sig, the cleanup occurs at the priority of the thread that received the signal.
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The kill() function sends the signal sig to a process or group of processes specified by pid. If sig is zero, no signal is sent, but the pid is still checked for validity.
For a process to have permission to send a signal to a process, either:
Or:
If the value of pid causes sig to be generated for the sending process, and if sig isn't blocked, either sig or at least one pending unblocked signal is delivered before the kill function returns.
This call doesn't block. However, in the network case, lower priority threads may run.
Zero, or -1 if an error occurs (errno is set).
See sigprocmask().
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |