raise - send a signal to the caller
int raise(int sig);
The raise() function sends a signal to the calling process or thread. In
a single-threaded program it is equivalent to
In a multithreaded program it is equivalent to
If the signal causes a handler to be called, raise() will
return only after the signal handler has returned.
raise() returns 0 on success, and nonzero for failure.
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C89, C99.
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).
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