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SLEEP(3) Linux Programmer's Manual SLEEP(3)
NAME
sleep - sleep for a specified number of seconds
SYNOPSIS
#include <unistd.h>
unsigned int sleep(unsigned int seconds);
DESCRIPTION
sleep() causes the calling thread to sleep either until the number of real-time seconds specified in seconds have elapsed or until 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.
NOTES
On Linux, sleep() is implemented via nanosleep(2). See the nanosleep(2) man page for a discussion of the clock used.
Portability notes
On some systems, sleep() may be implemented using alarm(2) and SIGALRM (POSIX.1 permits this); 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 ALSO
sleep(1), alarm(2), nanosleep(2), signal(2), signal(7)
GNU 2021-03-22 SLEEP(3)