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TKILL (2) | System calls | Unix Manual Pages | :man

NAME

tkill - send a signal to a single process

CONTENTS

Synopsis
Description
Errors

SYNOPSIS



#include <sys/types.h>




#include <linux/unistd.h>



"_syscall2(int, tkill, pid_t, tid, int, sig)"



int tkill(pid_t tid, int sig);

DESCRIPTION

The tkill system call is analogous to kill(2), except when the specified process is part of a thread group (created by specifying the CLONE_THREAD flag in the call to clone). Since all the processes in a thread group have the same PID, they cannot be individually signalled with kill. With tkill, however, one can address each process by its unique TID.

"RETURN VALUE"

On success, zero is returned. On error, -1 is returned, and errno is set appropriately.

ERRORS

EINVAL An invalid TID or signal was specified.
ESRCH No process with the specified TID exists.
EPERM The caller did not have permission to send the signal to the specified process. For a process to be allowed to send a signal, it must either have root privileges, or its real or effective user ID must be equal to the real or saved set-user-ID of the receiving process.

"CONFORMING TO"

tkill is Linux specific and should not be used in programs that are intended to be portable.

"SEE ALSO"

gettid(2), kill(2)


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