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USLEEP(3) Linux Programmer's Manual USLEEP(3)
usleep - suspend execution for microsecond intervals
void usleep(unsigned long usec);
int usleep(unsigned long usec); /* SUSv2 */
The usleep() function suspends execution of the calling process for usec microseconds.
The sleep may be lengthened slightly by any system activity or by the time spent process-
ing the call.
None (BSD). Or: 0 on success, -1 on error (SUSv2).
EINTR Interrupted by a signal.
EINVAL usec is not smaller than 1000000. (On systems where that is considered an error.)
BSD 4.3. The SUSv2 version returns int, and this is also the prototype used by glibc
2.2.2. Only the EINVAL error return is documented by SUSv2.
The interaction of this function with SIGALRM and other timer functions such as sleep(),
alarm(), setitimer(), nanosleep() is unspecified. This function is obsolete. Use
nanosleep(2) or setitimer(2) instead.
alarm(2), getitimer(2), nanosleep(2), select(2), setitimer(2), sleep(3)
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