(libc.info.gz) Using Pause
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24.8.1 Using 'pause'
--------------------
The simple way to wait until a signal arrives is to call 'pause'.
Please read about its disadvantages, in the following section, before
you use it.
-- Function: int pause (void)
Preliminary: | MT-Unsafe race:sigprocmask/!bsd!linux | AS-Unsafe
lock/hurd | AC-Unsafe lock/hurd | POSIX Safety Concepts.
The 'pause' function suspends program execution until a signal
arrives whose action is either to execute a handler function, or to
terminate the process.
If the signal causes a handler function to be executed, then
'pause' returns. This is considered an unsuccessful return (since
"successful" behavior would be to suspend the program forever), so
the return value is '-1'. Even if you specify that other
primitives should resume when a system handler returns (
Interrupted Primitives), this has no effect on 'pause'; it always
fails when a signal is handled.
The following 'errno' error conditions are defined for this
function:
'EINTR'
The function was interrupted by delivery of a signal.
If the signal causes program termination, 'pause' doesn't return
(obviously).
This function is a cancellation point in multithreaded programs.
This is a problem if the thread allocates some resources (like
memory, file descriptors, semaphores or whatever) at the time
'pause' is called. If the thread gets cancelled these resources
stay allocated until the program ends. To avoid this calls to
'pause' should be protected using cancellation handlers.
The 'pause' function is declared in 'unistd.h'.
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