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USLEEP(3) BSD Library Functions Manual USLEEP(3) NAME usleep -- suspend process execution for an interval measured in microsec- onds LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <unistd.h> int usleep(useconds_t microseconds); DESCRIPTION The usleep() function suspends execution of the calling process until ei- ther microseconds microseconds have elapsed or a signal is delivered to the process and its action is to invoke a signal-catching function or to terminate the process. System activity may lengthen the sleep by an in- determinate amount. This function is implemented using nanosleep(2) by pausing for microseconds microseconds or until a signal occurs. Consequently, in this implementation, 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 process and its action was to invoke a signal-catching function. SEE ALSO nanosleep(2), sleep(3) HISTORY The usleep() function appeared in 4.3BSD. BSD February 13, 1998 BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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