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calls a function that is not async-signal-safe, the behavior is undefined. |
a future revision of the standard |
.\" http://www.opengroup.org/austin/aardvark/latest/xshbug3.txt |
is likely to remove |
.br fork (2) |
from the list of async-signal-safe functions. |
.\" |
.ip * 3 |
asynchronous signal handlers that call functions which are cancellation |
points and nest over regions of deferred cancellation may trigger |
cancellation whose behavior is as if asynchronous cancellation had |
occurred and may cause application state to become inconsistent. |
.\" |
.ss errno |
fetching and setting the value of |
.i errno |
is async-signal-safe provided that the signal handler saves |
.i errno |
on entry and restores its value before returning. |
.\" |
.ss deviations in the gnu c library |
the following known deviations from the standard occur in |
the gnu c library: |
.ip * 3 |
before glibc 2.24, |
.br execl (3) |
and |
.br execle (3) |
employed |
.br realloc (3) |
internally and were consequently not async-signal-safe. |
.\" https://sourceware.org/bugzilla/show_bug.cgi?id=19534 |
this was fixed in glibc 2.24. |
.ip * |
.\" fixme . https://sourceware.org/bugzilla/show_bug.cgi?id=13172 |
the glibc implementation of |
.br aio_suspend (3) |
is not async-signal-safe because it uses |
.br pthread_mutex_lock (3) |
internally. |
.sh see also |
.br sigaction (2), |
.br signal (7), |
.br standards (7) |
.sh colophon |
this page is part of release 5.13 of the linux |
.i man-pages |
project. |
a description of the project, |
information about reporting bugs, |
and the latest version of this page, |
can be found at |
\%https://www.kernel.org/doc/man\-pages/. |
.so man3/circleq.3 |
.\" copyright (c) 1995 martin schulze <[email protected]> |
.\" |
.\" %%%license_start(gplv2+_doc_full) |
.\" this is free documentation; you can redistribute it and/or |
.\" modify it under the terms of the gnu general public license as |
.\" published by the free software foundation; either version 2 of |
.\" the license, or (at your option) any later version. |
.\" |
.\" the gnu general public license's references to "object code" |
.\" and "executables" are to be interpreted as the output of any |
.\" document formatting or typesetting system, including |
.\" intermediate and printed output. |
.\" |
.\" this manual is distributed in the hope that it will be useful, |
.\" but without any warranty; without even the implied warranty of |
.\" merchantability or fitness for a particular purpose. see the |
.\" gnu general public license for more details. |
.\" |
.\" you should have received a copy of the gnu general public |
.\" license along with this manual; if not, see |
.\" <http://www.gnu.org/licenses/>. |
.\" %%%license_end |
.\" |
.\" 1995-10-18 martin schulze <[email protected]> |
.\" * first released |
.\" 2002-09-22 seth w. klein <[email protected]> |
.\" * protocol numbers are now assigned by the iana |
.\" |
.th protocols 5 2012-08-05 "linux" "linux programmer's manual" |
.sh name |
protocols \- protocols definition file |
.sh description |
this file is a plain ascii file, describing the various darpa internet |
protocols that are available from the tcp/ip subsystem. |
it should be |
consulted instead of using the numbers in the arpa include files, or, |
even worse, just guessing them. |
these numbers will occur in the |
protocol field of any ip header. |
.pp |
keep this file untouched since changes would result in incorrect ip |
packages. |
protocol numbers and names are specified by the iana |
(internet assigned numbers authority). |
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