sleep(3C)                                                         sleep(3C)

NAME
     sleep - suspend execution

SYNOPSIS
     #include <unistd.h>

     unsigned int sleep(unsigned int seconds);

DESCRIPTION
     The sleep() function will cause the current process to be suspended
     from execution until either the number of real-time seconds specified
     by the argument seconds has elapsed or a signal is delivered to the
     calling process and its action is to invoke a signal-catching function
     or to terminate the process. The suspension time may be longer than
     requested due to the scheduling of other activity by the system.

     If a SIGALRM signal is generated for the calling process during execu-
     tion of sleep() and if the SIGALRM signal is being ignored or blocked
     from delivery, it is unspecified whether sleep() returns when the
     SIGALRM signal is scheduled. If the signal is being blocked, it is
     also unspecified whether it remains pending after sleep() returns or
     it is discarded.

     If a SIGALRM signal is generated for the calling process during execu-
     tion of sleep(), except as a result of a prior call to alarm(), and if
     the SIGALRM signal is not being ignored or blocked from delivery, it
     is unspecified whether that signal has any effect other than causing
     sleep() to return.

     If a signal-catching function interrupts sleep() and examines or
     changes either the time a SIGALRM is scheduled to be generated, the
     action associated with the SIGALRM signal, or whether the SIGALRM sig-
     nal is blocked from delivery, the results are unspecified.

     If a signal-catching function interrupts sleep() and calls
     siglongjmp() or longjmp() to restore an environment saved prior to the
     sleep() call, the action associated with the SIGALRM signal and the
     time at which a SIGALRM signal is scheduled to be generated are
     unspecified. It is also unspecified whether the SIGALRM signal is
     blocked, unless the process' signal mask is restored as part of the
     environment.

     Interactions between sleep() and any of setitimer(), ualarm() or
     usleep() are unspecified.

RETURN VALUE
     If sleep() returns because the requested time has elapsed, the value
     returned will be 0. If sleep() returns because of premature arousal
     due to delivery of a signal, the return value will be the "unslept"
     amount (the requested time minus the time actually slept) in seconds.





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sleep(3C)                                                         sleep(3C)

SEE ALSO
     alarm(2), pause(2), sigaction(2), signal(2), wait(2), ualarm(3),
     usleep(3), getitimer(3C), sigsetjmp(3C), unistd(4).



















































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