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USLEEP(3) Library Functions Manual USLEEP(3) NAME usleep -- suspend thread execution for an interval measured in microseconds LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> int usleep(useconds_t microseconds); DESCRIPTION The usleep() function suspends execution of the calling thread until either microseconds microseconds have elapsed or a signal is delivered to the thread and its action is to invoke a signal-catching function or to termi- nate the process. System activity may lengthen the sleep by an indetermi- nate amount. This function is implemented using nanosleep(2) by pausing for microseconds microseconds or until a signal occurs. Consequently, in this implementa- tion, sleeping has no effect on the state of process timers, and there is no special handling for SIGALRM. RETURN VALUES The usleep() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. ERRORS The usleep() function will fail if: [EINTR] A signal was delivered to the calling thread and its ac- tion was to invoke a signal-catching function. SEE ALSO nanosleep(2), sleep(3) HISTORY The usleep() function appeared in 4.3BSD. FreeBSD ports 15.1 February 11, 2021 USLEEP(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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