HP 3000 Manuals HP 3000 Manuals
sleep
Delays process execution.
Syntax
#include <unistd.h>
unsigned int sleep (unsigned int seconds);
Parameters
seconds Specifies the number of real time seconds to sleep.
Return Values
No return If the action associated with a signal is to terminate,
sleep() does not return.
0 The requested time has elapsed.
>0 The difference between seconds and the actual number of
seconds slept before delivery of a signal whose action is to
execute a signal handling function.
Description
The sleep() function suspends the calling process from execution either
for the number of real-time seconds specified by the seconds parameter or
until the delivery of a signal whose action is either to execute a
signal-handling function or to terminate the process.
If seconds real-time seconds have passed without receipt of a signal with
the appropriate action, sleep() returns control to the calling process.
If the action associated with a received signal is to execute a signal
handling function, upon completion of the function, sleep() returns
control to the calling process. If the signal action is to terminate the
process, sleep() does not return.
Due to system activity, the process may be suspended for more than the
number of real-time seconds indicated by the seconds parameter.
Implementation Considerations
The SIGALRM signal is not used to implement sleep().
Errors
None.
See Also
alarm(), pause(), sigaction(), POSIX.1 (Section 3.4.3).