diff options
Diffstat (limited to 'man2/clock_nanosleep.2')
| -rw-r--r-- | man2/clock_nanosleep.2 | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/man2/clock_nanosleep.2 b/man2/clock_nanosleep.2 index d1e53a6..12948c7 100644 --- a/man2/clock_nanosleep.2 +++ b/man2/clock_nanosleep.2 @@ -3,31 +3,31 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH clock_nanosleep 2 2023-03-30 "Linux man-pages 6.05.01" +.TH clock_nanosleep 2 2024-03-05 "Linux man-pages 6.7" .SH NAME clock_nanosleep \- high-resolution sleep with specifiable clock .SH LIBRARY Standard C library .RI ( libc ", " \-lc ), since glibc 2.17 -.PP +.P Before glibc 2.17, Real-time library .RI ( librt ", " \-lrt ) .SH SYNOPSIS .B #include <time.h> .nf -.PP +.P .BI "int clock_nanosleep(clockid_t " clockid ", int " flags , -.BI " const struct timespec *" request , +.BI " const struct timespec *" t , .BI " struct timespec *_Nullable " remain ); .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR clock_nanosleep (): .nf _POSIX_C_SOURCE >= 200112L @@ -42,11 +42,11 @@ It differs in allowing the caller to select the clock against which the sleep interval is to be measured, and in allowing the sleep interval to be specified as either an absolute or a relative value. -.PP +.P The time values passed to and returned by this call are specified using .BR timespec (3) structures. -.PP +.P The .I clockid argument specifies the clock against which the sleep interval @@ -59,7 +59,7 @@ This argument can have one of the following values: A settable system-wide real-time clock. .TP .BR CLOCK_TAI " (since Linux 3.10)" -A system-wide clock derived from wall-clock time but ignoring leap seconds. +A system-wide clock derived from wall-clock time but counting leap seconds. .TP .B CLOCK_MONOTONIC A nonsettable, monotonically increasing clock that measures time @@ -77,7 +77,7 @@ A settable per-process clock that measures CPU time consumed by all threads in the process. .\" There is some trickery between glibc and the kernel .\" to deal with the CLOCK_PROCESS_CPUTIME_ID case. -.PP +.P See .BR clock_getres (2) for further details on these clocks. @@ -90,38 +90,38 @@ can also be passed in .\" Sleeping against CLOCK_REALTIME_ALARM and CLOCK_BOOTTIME_ALARM .\" is also possible (tested), with CAP_WAKE_ALARM, but I'm not .\" sure if this is useful or needs to be documented. -.PP +.P If .I flags is 0, then the value specified in -.I request +.I t is interpreted as an interval relative to the current value of the clock specified by .IR clockid . -.PP +.P If .I flags is .BR TIMER_ABSTIME , then -.I request +.I t is interpreted as an absolute time as measured by the clock, .IR clockid . If -.I request +.I t is less than or equal to the current value of the clock, then .BR clock_nanosleep () returns immediately without suspending the calling thread. -.PP +.P .BR clock_nanosleep () suspends the execution of the calling thread until either at least the time specified by -.I request +.I t has elapsed, or a signal is delivered that causes a signal handler to be called or that terminates the process. -.PP +.P If the call is interrupted by a signal handler, .BR clock_nanosleep () fails with the error @@ -146,7 +146,7 @@ then it returns one of the positive error number listed in ERRORS. .SH ERRORS .TP .B EFAULT -.I request +.I t or .I remain specified an invalid address. @@ -180,13 +180,13 @@ Linux 2.6, glibc 2.1. .SH NOTES If the interval specified in -.I request +.I t is not an exact multiple of the granularity underlying clock (see .BR time (7)), then the interval will be rounded up to the next multiple. Furthermore, after the sleep completes, there may still be a delay before the CPU becomes free to once again execute the calling thread. -.PP +.P Using an absolute timer is useful for preventing timer drift problems of the type described in .BR nanosleep (2). @@ -201,14 +201,14 @@ and then call with the .B TIMER_ABSTIME flag. -.PP +.P .BR clock_nanosleep () is never restarted after being interrupted by a signal handler, regardless of the use of the .BR sigaction (2) .B SA_RESTART flag. -.PP +.P The .I remain argument is unused, and unnecessary, when @@ -216,13 +216,13 @@ argument is unused, and unnecessary, when is .BR TIMER_ABSTIME . (An absolute sleep can be restarted using the same -.I request +.I t argument.) -.PP +.P POSIX.1 specifies that .BR clock_nanosleep () has no effect on signals dispositions or the signal mask. -.PP +.P POSIX.1 specifies that after changing the value of the .B CLOCK_REALTIME clock via @@ -234,7 +234,7 @@ will wake up; if the new clock value falls past the end of the sleep interval, then the .BR clock_nanosleep () call will return immediately. -.PP +.P POSIX.1 specifies that changing the value of the .B CLOCK_REALTIME |