SLEEPSection: Linux Programmer's Manual (3)
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NAMEsleep - Sleep for the specified number of seconds
#include <unistd.h> unsigned int sleep(unsigned int seconds);
DESCRIPTIONsleep() makes the calling process sleep until seconds seconds have elapsed or a signal arrives which is not ignored.
RETURN VALUEZero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.
BUGSsleep() 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.
SEE ALSOalarm(2), signal(2), signal(7)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.