USLEEP_RANGE(9) Driver Basics USLEEP_RANGE(9)NAME
usleep_range - Drop in replacement for udelay where wakeup is flexible
void usleep_range(unsigned long min, unsigned long max);
Minimum time in usecs to sleep
Maximum time in usecs to sleep
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 USLEEP_RANGE(9)
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USLEEP(3) Linux Programmer's Manual USLEEP(3)NAME
usleep - suspend execution for microsecond intervals
int usleep(useconds_t usec);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
usleep(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
The usleep() function suspends execution of the calling process for (at least) usec microseconds. The sleep may be lengthened slightly by
any system activity or by the time spent processing the call or by the granularity of system timers.
0 on success, -1 on error.
EINTR Interrupted by a signal; see signal(7).
EINVAL usec is not smaller than 1000000. (On systems where that is considered an error.)
4.3BSD, POSIX.1-2001. POSIX.1-2001 declares this function obsolete; use nanosleep(2) instead. POSIX.1-2008 removes the specification of
On the original BSD implementation, and in glibc before version 2.2.2, the return type of this function is void. The POSIX version returns
int, and this is also the prototype used since glibc 2.2.2.
Only the EINVAL error return is documented by SUSv2 and POSIX.1-2001.
The type useconds_t is an unsigned integer type capable of holding integers in the range [0,1000000]. Programs will be more portable if
they never mention this type explicitly. Use
unsigned int usecs;
The interaction of this function with the SIGALRM signal, and with other timer functions such as alarm(2), sleep(3), nanosleep(2),
setitimer(2), timer_create(2), timer_delete(2), timer_getoverrun(2), timer_gettime(2), timer_settime(2), ualarm(3) is unspecified.
SEE ALSO alarm(2), getitimer(2), nanosleep(2), select(2), setitimer(2), sleep(3), ualarm(3), time(7)COLOPHON
This page is part of release 3.25 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/.
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