| .\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de) |
| .\" |
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| .\" permission notice identical to this one. |
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| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
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| .\" Modified Sat Jul 24 18:16:02 1993 by Rik Faith (faith@cs.unc.edu) |
| .TH SLEEP 3 1993-04-07 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| sleep \- Sleep for the specified number of seconds |
| .SH SYNOPSIS |
| .nf |
| .B #include <unistd.h> |
| .sp |
| .BI "unsigned int sleep(unsigned int " "seconds" ); |
| .fi |
| .SH DESCRIPTION |
| .BR sleep () |
| makes the current process sleep until |
| .I seconds |
| seconds have elapsed or a signal arrives which is not ignored. |
| .SH "RETURN VALUE" |
| Zero if the requested time has elapsed, or the number of seconds left to sleep. |
| .SH "CONFORMING TO" |
| POSIX.1 |
| .SH BUGS |
| .BR sleep () |
| may be implemented using |
| .BR SIGALRM ; |
| mixing calls to |
| .BR alarm () |
| and |
| .BR sleep () |
| is a bad idea. |
| .PP |
| Using |
| .BR longjmp () |
| from a signal handler or modifying the handling of |
| .B SIGALRM |
| while sleeping will cause undefined results. |
| .SH "SEE ALSO" |
| .BR alarm (2), |
| .BR signal (2) |