sleep — sleep for the specified number of seconds
Synopsis
#include <unistd.h>
unsigned int sleep(unsigned int seconds);
Description
sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.Return value
Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.Attributes
For an explanation of the terms used in this section, see attributes(7).| Interface | Attribute |
Value |
| sleep() | Thread safety | MT-Unsafe sig:SIGCHLD/linux |
Conforming to
POSIX.1-2001, POSIX.1-2008.Bugs
sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea.Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.
Colophon
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