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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
191 lines
5.1 KiB
C
191 lines
5.1 KiB
C
/* Copyright (C) 2001-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <netdb.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <gai_misc.h>
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/* We need this special structure to handle asynchronous I/O. */
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struct async_waitlist
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{
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unsigned int counter;
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struct sigevent sigev;
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struct waitlist list[0];
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};
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int
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__getaddrinfo_a (int mode, struct gaicb *list[], int ent, struct sigevent *sig)
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{
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struct sigevent defsigev;
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struct requestlist *requests[ent];
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int cnt;
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volatile unsigned int total = 0;
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int result = 0;
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/* Check arguments. */
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if (mode != GAI_WAIT && mode != GAI_NOWAIT)
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{
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__set_errno (EINVAL);
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return EAI_SYSTEM;
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}
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if (sig == NULL)
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{
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defsigev.sigev_notify = SIGEV_NONE;
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sig = &defsigev;
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}
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/* Request the mutex. */
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__pthread_mutex_lock (&__gai_requests_mutex);
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/* Now we can enqueue all requests. Since we already acquired the
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mutex the enqueue function need not do this. */
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for (cnt = 0; cnt < ent; ++cnt)
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if (list[cnt] != NULL)
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{
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requests[cnt] = __gai_enqueue_request (list[cnt]);
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if (requests[cnt] != NULL)
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/* Successfully enqueued. */
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++total;
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else
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/* Signal that we've seen an error. `errno' and the error code
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of the gaicb will tell more. */
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result = EAI_SYSTEM;
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}
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else
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requests[cnt] = NULL;
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if (total == 0)
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{
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/* We don't have anything to do except signalling if we work
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asynchronously. */
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/* Release the mutex. We do this before raising a signal since the
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signal handler might do a `siglongjmp' and then the mutex is
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locked forever. */
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__pthread_mutex_unlock (&__gai_requests_mutex);
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if (mode == GAI_NOWAIT)
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__gai_notify_only (sig,
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sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0);
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return result;
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}
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else if (mode == GAI_WAIT)
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{
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#ifndef DONT_NEED_GAI_MISC_COND
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pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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#endif
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struct waitlist waitlist[ent];
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int oldstate;
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total = 0;
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for (cnt = 0; cnt < ent; ++cnt)
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if (requests[cnt] != NULL)
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{
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#ifndef DONT_NEED_GAI_MISC_COND
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waitlist[cnt].cond = &cond;
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#endif
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waitlist[cnt].next = requests[cnt]->waiting;
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waitlist[cnt].counterp = &total;
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waitlist[cnt].sigevp = NULL;
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waitlist[cnt].caller_pid = 0; /* Not needed. */
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requests[cnt]->waiting = &waitlist[cnt];
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++total;
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}
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/* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
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points we must be careful. We added entries to the waiting lists
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which we must remove. So defer cancelation for now. */
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__pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
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while (total > 0)
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{
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#ifdef DONT_NEED_GAI_MISC_COND
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int not_used __attribute__ ((unused));
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GAI_MISC_WAIT (not_used, total, NULL, 1);
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#else
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pthread_cond_wait (&cond, &__gai_requests_mutex);
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#endif
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}
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/* Now it's time to restore the cancelation state. */
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__pthread_setcancelstate (oldstate, NULL);
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#ifndef DONT_NEED_GAI_MISC_COND
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/* Release the conditional variable. */
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if (pthread_cond_destroy (&cond) != 0)
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/* This must never happen. */
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abort ();
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#endif
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}
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else
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{
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struct async_waitlist *waitlist;
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waitlist = (struct async_waitlist *)
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malloc (sizeof (struct async_waitlist)
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+ (ent * sizeof (struct waitlist)));
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if (waitlist == NULL)
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result = EAI_AGAIN;
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else
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{
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pid_t caller_pid = sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0;
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total = 0;
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for (cnt = 0; cnt < ent; ++cnt)
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if (requests[cnt] != NULL)
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{
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#ifndef DONT_NEED_GAI_MISC_COND
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waitlist->list[cnt].cond = NULL;
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#endif
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waitlist->list[cnt].next = requests[cnt]->waiting;
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waitlist->list[cnt].counterp = &waitlist->counter;
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waitlist->list[cnt].sigevp = &waitlist->sigev;
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waitlist->list[cnt].caller_pid = caller_pid;
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requests[cnt]->waiting = &waitlist->list[cnt];
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++total;
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}
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waitlist->counter = total;
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waitlist->sigev = *sig;
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}
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}
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/* Release the mutex. */
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__pthread_mutex_unlock (&__gai_requests_mutex);
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return result;
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}
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#if PTHREAD_IN_LIBC
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versioned_symbol (libc, __getaddrinfo_a, getaddrinfo_a, GLIBC_2_34);
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# if OTHER_SHLIB_COMPAT (libanl, GLIBC_2_2_3, GLIBC_2_34)
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compat_symbol (libanl, __getaddrinfo_a, getaddrinfo_a, GLIBC_2_2_3);
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# endif
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#else /* !PTHREAD_IN_LIBC */
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strong_alias (__getaddrinfo_a, getaddrinfo_a)
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#endif /* !PTHREAD_IN_LIBC */
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