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RAISE(3)                   Linux Programmer's Manual                  RAISE(3)
NAME
       raise - send a signal to the caller
SYNOPSIS
       #include <signal.h>
       int raise(int sig);
DESCRIPTION
       The  raise()  function sends a signal to the calling process or thread.
       In a single-threaded program it is equivalent to
           kill(getpid(), sig);
       In a multithreaded program it is equivalent to
           pthread_kill(pthread_self(), sig);
       If the signal causes a handler to be called, raise() will  return  only
       after the signal handler has returned.
RETURN VALUE
       raise() returns 0 on success, and nonzero for failure.
ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).
       +----------+---------------+---------+
       |Interface | Attribute     | Value   |
       +----------+---------------+---------+
       |raise()   | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C89, C99.
NOTES
       Since version 2.3.3, glibc implements raise() by calling tgkill(2),  if
       the kernel supports that system call.  Older glibc versions implemented
       raise() using kill(2).
SEE ALSO
       getpid(2), kill(2), sigaction(2), signal(2), pthread_kill(3), signal(7)
COLOPHON
       This page is part of release 4.15 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.
GNU                               2015-08-08                          RAISE(3)