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    Command:

    tgkill

    
    
    

    SYNOPSIS

           int tkill(int tid, int sig);
    
           int tgkill(int tgid, int tid, int sig);
    
           Note: There are no glibc wrappers for these system calls; see NOTES.
    
    
    

    DESCRIPTION

           tgkill()  sends  the signal sig to the thread with the thread ID tid in
           the thread group tgid.  (By contrast, kill(2) can be  used  to  send  a
           signal  only to a process (i.e., thread group) as a whole, and the sig-
           nal will be delivered to an arbitrary thread within that process.)
    
           tkill() is an obsolete predecessor to tgkill().   It  allows  only  the
           target  thread ID to be specified, which may result in the wrong thread
           being signaled if a thread terminates and its thread  ID  is  recycled.
           Avoid using this system call.
    
           If tgid is specified as -1, tgkill() is equivalent to tkill().
    
           These  are  the  raw  system call interfaces, meant for internal thread
           library use.
    
    
    

    RETURN VALUE

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

    ERRORS

           EINVAL An  invalid thread ID, thread group ID, or signal was specified.
    
           EPERM  Permission denied.  For the required permissions, see kill(2).
    
           ESRCH  No process with the specified thread ID (and  thread  group  ID)
                  exists.
    
    
    

    VERSIONS

           tkill() is supported since Linux 2.4.19 / 2.5.4.  tgkill() was added in
           Linux 2.5.75.
    
    
    

    CONFORMING TO

           tkill() and tgkill() are Linux-specific and should not be used in  pro-
           grams that are intended to be portable.
    
    
    

    NOTES

           See  the  description of CLONE_THREAD in clone(2) for an explanation of
           thread groups.
    
           Glibc does not provide wrappers for these system calls; call them using
           syscall(2).
    
    
    

    SEE ALSO

           clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)
    
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