diff options
Diffstat (limited to 'resolv')
| -rw-r--r-- | resolv/Makefile | 20 | ||||
| -rw-r--r-- | resolv/Versions | 9 | ||||
| -rw-r--r-- | resolv/ga_test.c | 99 | ||||
| -rw-r--r-- | resolv/gai_cancel.c | 48 | ||||
| -rw-r--r-- | resolv/gai_error.c | 28 | ||||
| -rw-r--r-- | resolv/gai_misc.c | 423 | ||||
| -rw-r--r-- | resolv/gai_misc.h | 100 | ||||
| -rw-r--r-- | resolv/gai_notify.c | 100 | ||||
| -rw-r--r-- | resolv/gai_suspend.c | 147 | ||||
| -rw-r--r-- | resolv/getaddrinfo_a.c | 168 | ||||
| -rw-r--r-- | resolv/netdb.h | 72 |
11 files changed, 1199 insertions, 15 deletions
diff --git a/resolv/Makefile b/resolv/Makefile index 64afbcb..fd056d0 100644 --- a/resolv/Makefile +++ b/resolv/Makefile @@ -1,4 +1,4 @@ -# Copyright (C) 1994,95,96,97,98,99,2000 Free Software Foundation, Inc. +# Copyright (C) 1994,95,96,97,98,99,2000,2001 Free Software Foundation, Inc. # This file is part of the GNU C Library. # The GNU C Library is free software; you can redistribute it and/or @@ -26,16 +26,16 @@ headers := resolv.h \ arpa/nameser.h arpa/nameser_compat.h \ sys/bitypes.h distribute := ../conf/portability.h mapv4v6addr.h mapv4v6hostent.h \ - Banner res_hconf.h res_debug.h README + Banner res_hconf.h res_debug.h README gai_misc.h ga_test.c routines := herror inet_addr inet_ntop inet_pton nsap_addr res_init \ - res_hconf res_libc + res_hconf res_libc gai_sigqueue tests = tst-aton include ../Makeconfig -extra-libs := libresolv libnss_dns +extra-libs := libresolv libanl libnss_dns extra-libs-others = $(extra-libs) libresolv-routines := gethnamaddr res_comp res_debug \ res_data res_mkquery res_query res_send \ @@ -43,6 +43,9 @@ libresolv-routines := gethnamaddr res_comp res_debug \ ns_parse ns_name ns_netint ns_ttl ns_print \ ns_samedomain +libanl-routines := gai_cancel gai_error gai_misc gai_notify gai_suspend \ + getaddrinfo_a + subdir-dirs = nss_dns vpath %.c nss_dns @@ -51,6 +54,10 @@ ifneq ($(build-static-nss),yes) libnss_dns-inhibit-o = $(filter-out .os,$(object-suffixes)) endif +ifeq (yes,$(build-shared)) +tests: $(objpfx)ga_test +endif + include ../Rules CPPFLAGS += -Dgethostbyname=res_gethostbyname \ @@ -69,3 +76,8 @@ $(objpfx)libresolv.so: $(common-objpfx)libc.so # The DNS NSS modules needs the resolver. $(objpfx)libnss_dns.so: $(objpfx)libresolv.so $(common-objpfx)libc.so + +# The asynchronous name lookup code needs the thread library. +$(objpfx)libanl.so: $(common-objpfx)libc.so $(shared-thread-library) + +$(objpfx)ga_test: $(objpfx)libanl.so $(shared-thread-library) diff --git a/resolv/Versions b/resolv/Versions index 8131f1d..b76b112 100644 --- a/resolv/Versions +++ b/resolv/Versions @@ -22,6 +22,9 @@ libc { # r* __res_state; __res_init; __res_nclose; __res_ninit; _res_hconf; } + GLIBC_2.2.3 { + __gai_sigqueue; + } } libresolv { @@ -66,3 +69,9 @@ libnss_dns { _nss_dns_getnetbyname_r; } } + +libanl { + GLIBC_2.2.3 { + getaddrinfo_a; gai_cancel; gai_error; gai_suspend; + } +} diff --git a/resolv/ga_test.c b/resolv/ga_test.c new file mode 100644 index 0000000..673162f --- /dev/null +++ b/resolv/ga_test.c @@ -0,0 +1,99 @@ +#include <arpa/inet.h> +#include <netinet/in.h> +#include <netdb.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> + + +int +main (void) +{ +#define N 10 + struct gaicb reqmem[N]; + struct gaicb *req[N]; + int n; + + for (n = 0; n < N; ++n) + { + asprintf (&reqmem[n].ar_name, "test%d.test.redhat.com", 140 + n); + reqmem[n].ar_service = NULL; + reqmem[n].ar_request = NULL; + reqmem[n].ar_result = NULL; + req[n] = &reqmem[n]; + } + + if (getaddrinfo_a (GAI_NOWAIT, req, N, NULL) != 0) + { + puts ("queue call failed"); + exit (1); + } + else + puts ("queue call successful"); + + while (1) + { + int any = 0; + + for (n = 0; n < N; ++n) + if (req[n] != NULL && gai_error (req[n]) != EAI_INPROGRESS) + { + if (gai_error (req[n]) == 0) + { + struct addrinfo *runp = req[n]->ar_result; + + while (runp != NULL) + { + switch (runp->ai_family) + { + case PF_INET: + { + struct sockaddr_in *sinp; + + sinp = (struct sockaddr_in *) runp->ai_addr; + printf ("%2d: %s = %s\n", n, + req[n]->ar_name, inet_ntoa (sinp->sin_addr)); + } + break; + default: + printf ("%2d: family %d\n", n, runp->ai_family); + break; + } + runp = runp->ai_next; + } + } + else + printf ("error for %d: %s\n", n, + gai_strerror (gai_error (req[n]))); + req[n] = NULL; + break; + } + else if (req[n] != NULL) + any = 1; + + if (n == N) + { + if (any) + gai_suspend (req, N, NULL); + else + break; + } + } + + __libc_write(1,"got all\n", 8); + + for (n = 0; n < N; ++n) + if (gai_error (&reqmem[n]) == 0) + { + struct addrinfo *runp = reqmem[n].ar_result; + + while (runp != NULL) + { + struct addrinfo *oldp = runp; + runp = runp->ai_next; + freeaddrinfo (oldp); + } + } + + return 0; +} diff --git a/resolv/gai_cancel.c b/resolv/gai_cancel.c new file mode 100644 index 0000000..13c6488 --- /dev/null +++ b/resolv/gai_cancel.c @@ -0,0 +1,48 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library 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 C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <netdb.h> +#include <pthread.h> + +#include "gai_misc.h" + + +int +gai_cancel (struct gaicb *gaicbp) +{ + int result = 0; + int status; + + /* Request the mutex. */ + pthread_mutex_lock (&__gai_requests_mutex); + + /* Find the request among those queued but not yet running. */ + status = __gai_remove_request (gaicbp); + if (status == 0) + result = EAI_CANCELED; + else if (status > 0) + result = EAI_NOTCANCELED; + else + result = EAI_ALLDONE; + + /* Release the mutex. */ + pthread_mutex_unlock (&__gai_requests_mutex); + + return result; +} diff --git a/resolv/gai_error.c b/resolv/gai_error.c new file mode 100644 index 0000000..f3d36c5 --- /dev/null +++ b/resolv/gai_error.c @@ -0,0 +1,28 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library 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 C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <netdb.h> + +#include "gai_misc.h" + +int +gai_error (struct gaicb *req) +{ + return req->__return; +} diff --git a/resolv/gai_misc.c b/resolv/gai_misc.c new file mode 100644 index 0000000..b69a8f6 --- /dev/null +++ b/resolv/gai_misc.c @@ -0,0 +1,423 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library 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 C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <assert.h> +#include <errno.h> +#include <pthread.h> +#include <stdlib.h> +#include <sys/time.h> + +#include "gai_misc.h" + + + +/* Pool of request list entries. */ +static struct requestlist **pool; + +/* Number of total and allocated pool entries. */ +static size_t pool_max_size; +static size_t pool_size; + +/* We implement a two dimensional array but allocate each row separately. + The macro below determines how many entries should be used per row. + It should better be a power of two. */ +#define ENTRIES_PER_ROW 32 + +/* How many rows we allocate at once. */ +#define ROWS_STEP 8 + +/* List of available entries. */ +static struct requestlist *freelist; + +/* Structure list of all currently processed requests. */ +static struct requestlist *requests; +static struct requestlist *requests_tail; + +/* Number of threads currently running. */ +static int nthreads; + +/* Number of threads waiting for work to arrive. */ +static int idle_thread_count; + + +/* These are the values used for optimization. We will probably + create a funcion to set these values. */ +static struct gaiinit optim = +{ + 20, /* int gai_threads; Maximal number of threads. */ + 64, /* int gai_num; Number of expected simultanious requests. */ + 0, + 0, + 0, + 0, + 1, + 0 +}; + + +/* Since the list is global we need a mutex protecting it. */ +pthread_mutex_t __gai_requests_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; + +/* When you add a request to the list and there are idle threads present, + you signal this condition variable. When a thread finishes work, it waits + on this condition variable for a time before it actually exits. */ +pthread_cond_t __gai_new_request_notification = PTHREAD_COND_INITIALIZER; + + +/* Functions to handle request list pool. */ +static struct requestlist * +get_elem (void) +{ + struct requestlist *result; + + if (freelist == NULL) + { + struct requestlist *new_row; + int cnt; + + if (pool_size + 1 >= pool_max_size) + { + size_t new_max_size = pool_max_size + ROWS_STEP; + struct requestlist **new_tab; + + new_tab = (struct requestlist **) + realloc (pool, new_max_size * sizeof (struct requestlist *)); + + if (new_tab == NULL) + return NULL; + + pool_max_size = new_max_size; + pool = new_tab; + } + + /* Allocate the new row. */ + cnt = pool_size == 0 ? optim.gai_num : ENTRIES_PER_ROW; + new_row = (struct requestlist *) calloc (cnt, + sizeof (struct requestlist)); + if (new_row == NULL) + return NULL; + + pool[pool_size++] = new_row; + + /* Put all the new entries in the freelist. */ + do + { + new_row->next = freelist; + freelist = new_row++; + } + while (--cnt > 0); + } + + result = freelist; + freelist = freelist->next; + + return result; +} + + +struct requestlist * +internal_function +__gai_find_request (const struct gaicb *gaicbp) +{ + struct requestlist *runp; + + runp = requests; + while (runp != NULL) + if (runp->gaicbp == gaicbp) + return runp; + else + runp = runp->next; + + return NULL; +} + + +int +internal_function +__gai_remove_request (struct gaicb *gaicbp) +{ + struct requestlist *runp; + struct requestlist *lastp; + + runp = requests; + lastp = NULL; + while (runp != NULL) + if (runp->gaicbp == gaicbp) + break; + else + { + lastp = runp; + runp = runp->next; + } + + if (runp == NULL) + /* Not known. */ + return -1; + if (runp->running != 0) + /* Currently handled. */ + return 1; + + /* Dequeue the request. */ + if (lastp == NULL) + requests = runp->next; + else + lastp->next = runp->next; + if (runp == requests_tail) + requests_tail = lastp; + + return 0; +} + + +/* The thread handler. */ +static void *handle_requests (void *arg); + + +/* The main function of the async I/O handling. It enqueues requests + and if necessary starts and handles threads. */ +struct requestlist * +internal_function +__gai_enqueue_request (struct gaicb *gaicbp) +{ + struct requestlist *newp; + struct requestlist *lastp; + + /* Get the mutex. */ + pthread_mutex_lock (&__gai_requests_mutex); + + /* Get a new element for the waiting list. */ + newp = get_elem (); + if (newp == NULL) + { + pthread_mutex_unlock (&__gai_requests_mutex); + __set_errno (EAGAIN); + return NULL; + } + newp->running = 0; + newp->gaicbp = gaicbp; + newp->waiting = NULL; + newp->next = NULL; + + lastp = requests_tail; + if (requests_tail == NULL) + requests = requests_tail = newp; + else + { + requests_tail->next = newp; + requests_tail = newp; + } + + gaicbp->__return = EAI_INPROGRESS; + + /* See if we need to and are able to create a thread. */ + if (nthreads < optim.gai_threads && idle_thread_count == 0) + { + pthread_t thid; + pthread_attr_t attr; + + newp->running = 1; + + /* Make sure the thread is created detached. */ + pthread_attr_init (&attr); + pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); + + /* Now try to start a thread. */ + if (pthread_create (&thid, &attr, handle_requests, newp) == 0) + /* We managed to enqueue the request. All errors which can + happen now can be recognized by calls to `gai_error'. */ + ++nthreads; + else + { + if (nthreads == 0) + { + /* We cannot create a thread in the moment and there is + also no thread running. This is a problem. `errno' is + set to EAGAIN if this is only a temporary problem. */ + assert (lastp->next == newp); + lastp->next = NULL; + requests_tail = lastp; + + newp->next = freelist; + freelist = newp; + + newp = NULL; + } + else + /* We are not handling the request after all. */ + newp->running = 0; + } + } + + /* Enqueue the request in the request queue. */ + if (newp != NULL) + { + /* If there is a thread waiting for work, then let it know that we + have just given it something to do. */ + if (idle_thread_count > 0) + pthread_cond_signal (&__gai_new_request_notification); + } + + /* Release the mutex. */ + pthread_mutex_unlock (&__gai_requests_mutex); + + return newp; +} + + +static void * +handle_requests (void *arg) +{ + struct requestlist *runp = (struct requestlist *) arg; + + do + { + /* If runp is NULL, then we were created to service the work queue + in general, not to handle any particular request. In that case we + skip the "do work" stuff on the first pass, and go directly to the + "get work off the work queue" part of this loop, which is near the + end. */ + if (runp == NULL) + pthread_mutex_lock (&__gai_requests_mutex); + else + { + /* Make the request. */ + struct gaicb *req = runp->gaicbp; + struct requestlist *srchp; + struct requestlist *lastp; + + req->__return = getaddrinfo (req->ar_name, req->ar_service, + req->ar_request, &req->ar_result); + + /* Get the mutex. */ + pthread_mutex_lock (&__gai_requests_mutex); + + /* Send the signal to notify about finished processing of the + request. */ + __gai_notify (runp); + + /* Now dequeue the current request. */ + lastp = NULL; + srchp = requests; + while (srchp != runp) + { + lastp = srchp; + srchp = srchp->next; + } + assert (runp->running == 1); + + if (requests_tail == runp) + requests_tail = lastp; + if (lastp == NULL) + requests = requests->next; + else + lastp->next = runp->next; + + /* Free the old element. */ + runp->next = freelist; + freelist = runp; + } + + runp = requests; + while (runp != NULL && runp->running != 0) + runp = runp->next; + + /* If the runlist is empty, then we sleep for a while, waiting for + something to arrive in it. */ + if (runp == NULL && optim.gai_idle_time >= 0) + { + struct timeval now; + struct timespec wakeup_time; + + ++idle_thread_count; + gettimeofday (&now, NULL); + wakeup_time.tv_sec = now.tv_sec + optim.gai_idle_time; + wakeup_time.tv_nsec = now.tv_usec * 1000; + if (wakeup_time.tv_nsec > 1000000000) + { + wakeup_time.tv_nsec -= 1000000000; + ++wakeup_time.tv_sec; + } + pthread_cond_timedwait (&__gai_new_request_notification, + &__gai_requests_mutex, &wakeup_time); + --idle_thread_count; + runp = requests; + while (runp != NULL && runp->running != 0) + runp = runp->next; + } + + if (runp == NULL) + --nthreads; + else + { + /* Mark the request as being worked on. */ + assert (runp->running == 0); + runp->running = 1; + + /* If we have a request to process, and there's still another in + the run list, then we need to either wake up or create a new + thread to service the request that is still in the run list. */ + if (requests != NULL) + { + /* There are at least two items in the work queue to work on. + If there are other idle threads, then we should wake them + up for these other work elements; otherwise, we should try + to create a new thread. */ + if (idle_thread_count > 0) + pthread_cond_signal (&__gai_new_request_notification); + else if (nthreads < optim.gai_threads) + { + pthread_t thid; + pthread_attr_t attr; + + /* Make sure the thread is created detached. */ + pthread_attr_init (&attr); + pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); + + /* Now try to start a thread. If we fail, no big deal, + because we know that there is at least one thread (us) + that is working on lookup operations. */ + if (pthread_create (&thid, &attr, handle_requests, NULL) + == 0) + ++nthreads; + } + } + } + + /* Release the mutex. */ + pthread_mutex_unlock (&__gai_requests_mutex); + } + while (runp != NULL); + + pthread_exit (NULL); +} + + +/* Free allocated resources. */ +static void +__attribute__ ((unused)) +free_res (void) +{ + size_t row; + + for (row = 0; row < pool_max_size; ++row) + free (pool[row]); + + free (pool); +} +text_set_element (__libc_subfreeres, free_res); diff --git a/resolv/gai_misc.h b/resolv/gai_misc.h new file mode 100644 index 0000000..a37264e --- /dev/null +++ b/resolv/gai_misc.h @@ -0,0 +1,100 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library 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 C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _GAI_MISC_H +#define _GAI_MISC_H 1 + +#include <netdb.h> +#include <signal.h> + + +/* Used to synchronize. */ +struct waitlist + { + struct waitlist *next; + + pthread_cond_t *cond; + volatile int *counterp; + /* The next field is used in asynchronous `lio_listio' operations. */ + struct sigevent *sigevp; + /* XXX See requestlist, it's used to work around the broken signal + handling in Linux. */ + pid_t caller_pid; + }; + + +/* Used to queue requests.. */ +struct requestlist + { + int running; + + struct requestlist *next; + + /* Pointer to the actual data. */ + struct gaicb *gaicbp; + + /* List of waiting processes. */ + struct waitlist *waiting; + }; + +/* To customize the implementation one can use the following struct. + This implementation follows the one in Irix. */ +struct gaiinit + { + int gai_threads; /* Maximal number of threads. */ + int gai_num; /* Number of expected simultanious requests. */ + int gai_locks; /* Not used. */ + int gai_usedba; /* Not used. */ + int gai_debug; /* Not used. */ + int gai_numusers; /* Not used. */ + int gai_idle_time; /* Number of seconds before idle thread + terminates. */ + int gai_reserved; + }; + + +/* Lock for global I/O list of requests. */ +extern pthread_mutex_t __gai_requests_mutex; + + +/* Enqueue request. */ +extern struct requestlist *__gai_enqueue_request (struct gaicb *gaicbp) + internal_function; + +/* Find request on wait list. */ +extern struct requestlist *__gai_find_request (const struct gaicb *gaicbp) + internal_function; + +/* Remove request from waitlist. */ +extern int __gai_remove_request (struct gaicb *gaicbp) + internal_function; + +/* Notify initiator of request and tell this everybody listening. */ +extern void __gai_notify (struct requestlist *req) + internal_function; + +/* Notify initiator of request. */ +extern int __gai_notify_only (struct sigevent *sigev, pid_t caller_pid) + internal_function; + +/* Send the signal. */ +extern int __gai_sigqueue (int sig, const union sigval val, pid_t caller_pid) + internal_function; + +#endif /* gai_misc.h */ diff --git a/resolv/gai_notify.c b/resolv/gai_notify.c new file mode 100644 index 0000000..b3e623a --- /dev/null +++ b/resolv/gai_notify.c @@ -0,0 +1,100 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library 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 C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <netdb.h> +#include <pthread.h> +#include <stdlib.h> + +#include "gai_misc.h" + + +static void * +notify_func_wrapper (void *arg) +{ + struct sigevent *sigev = arg; + sigev->sigev_notify_function (sigev->sigev_value); + return NULL; +} + + +int +internal_function +__gai_notify_only (struct sigevent *sigev, pid_t caller_pid) +{ + int result = 0; + + /* Send the signal to notify about finished processing of the request. */ + if (sigev->sigev_notify == SIGEV_THREAD) + { + /* We have to start a thread. */ + pthread_t tid; + pthread_attr_t attr, *pattr; + + pattr = (pthread_attr_t *) sigev->sigev_notify_attributes; + if (pattr == NULL) + { + pthread_attr_init (&attr); + pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); + pattr = &attr; + } + + if (pthread_create (&tid, pattr, notify_func_wrapper, sigev) < 0) + result = -1; + } + else if (sigev->sigev_notify == SIGEV_SIGNAL) + /* We have to send a signal. */ + if (__gai_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid) + < 0) + result = -1; + + return result; +} + + +void +internal_function +__gai_notify (struct requestlist *req) +{ + struct waitlist *waitlist; + + /* Now also notify possibly waiting threads. */ + waitlist = req->waiting; + while (waitlist != NULL) + { + struct waitlist *next = waitlist->next; + + /* Decrement the counter. This is used in both cases. */ + --*waitlist->counterp; + + if (waitlist->sigevp == NULL) + pthread_cond_signal (waitlist->cond); + else + /* This is part of a asynchronous `getaddrinfo_a' operation. If + this request is the last one, send the signal. */ + if (*waitlist->counterp == 0) + { + __gai_notify_only (waitlist->sigevp, waitlist->caller_pid); + /* This is tricky. See getaddrinfo_a.c for the reason why + this works. */ + free ((void *) waitlist->counterp); + } + + waitlist = next; + } +} diff --git a/resolv/gai_suspend.c b/resolv/gai_suspend.c new file mode 100644 index 0000000..b82acb4 --- /dev/null +++ b/resolv/gai_suspend.c @@ -0,0 +1,147 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library 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 C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <netdb.h> +#include <pthread.h> +#include <stdlib.h> +#include <sys/time.h> + +#include "gai_misc.h" + + +int +gai_suspend (const struct gaicb *const list[], int ent, + const struct timespec *timeout) +{ + struct waitlist waitlist[ent]; + struct requestlist *requestlist[ent]; + pthread_cond_t cond = PTHREAD_COND_INITIALIZER; + int cnt; + int dummy; + int none = 1; + int result; + + /* Request the mutex. */ + pthread_mutex_lock (&__gai_requests_mutex); + + /* There is not yet a finished request. Signal the request that + we are working for it. */ + for (cnt = 0; cnt < ent; ++cnt) + if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS) + { + requestlist[cnt] = __gai_find_request (list[cnt]); + + if (requestlist[cnt] != NULL) + { + waitlist[cnt].cond = &cond; + waitlist[cnt].next = requestlist[cnt]->waiting; + waitlist[cnt].counterp = &dummy; + waitlist[cnt].sigevp = NULL; + waitlist[cnt].caller_pid = 0; /* Not needed. */ + requestlist[cnt]->waiting = &waitlist[cnt]; + none = 0; + } + } + + if (none) + { + if (cnt < ent) + /* There is an entry which is finished. */ + result = 0; + else + result = EAI_ALLDONE; + } + else + { + /* There is no request done but some are still being worked on. */ + int oldstate; + + /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation + points we must be careful. We added entries to the waiting lists + which we must remove. So defer cancelation for now. */ + pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate); + + if (timeout == NULL) + result = pthread_cond_wait (&cond, &__gai_requests_mutex); + else + { + /* We have to convert the relative timeout value into an + absolute time value with pthread_cond_timedwait expects. */ + struct timeval now; + struct timespec abstime; + + __gettimeofday (&now, NULL); + abstime.tv_nsec = timeout->tv_nsec + now.tv_usec * 1000; + abstime.tv_sec = timeout->tv_sec + now.tv_sec; + if (abstime.tv_nsec >= 1000000000) + { + abstime.tv_nsec -= 1000000000; + abstime.tv_sec += 1; + } + + result = pthread_cond_timedwait (&cond, &__gai_requests_mutex, + &abstime); + } + + /* Now remove the entry in the waiting list for all requests + which didn't terminate. */ + for (cnt = 0; cnt < ent; ++cnt) + if (list[cnt] != NULL && list[cnt]->__return == EAI_INPROGRESS + && requestlist[cnt] != NULL) + { + struct waitlist **listp = &requestlist[cnt]->waiting; + + /* There is the chance that we cannot find our entry anymore. + This could happen if the request terminated and restarted + again. */ + while (*listp != NULL && *listp != &waitlist[cnt]) + listp = &(*listp)->next; + + if (*listp != NULL) + *listp = (*listp)->next; + } + + /* Now it's time to restore the cancelation state. */ + pthread_setcancelstate (oldstate, NULL); + + /* Release the conditional variable. */ + if (pthread_cond_destroy (&cond) != 0) + /* This must never happen. */ + abort (); + + if (result != 0) + { + /* An error occurred. Possibly it's EINTR. We have to translate + the timeout error report of `pthread_cond_timedwait' to the + form expected from `gai_suspend'. */ + if (__builtin_expect (result, ETIMEDOUT) == ETIMEDOUT) + result = EAI_AGAIN; + else if (result == EINTR) + result = EAI_INTR; + else + result = EAI_SYSTEM; + } + } + + /* Release the mutex. */ + pthread_mutex_unlock (&__gai_requests_mutex); + + return result; +} diff --git a/resolv/getaddrinfo_a.c b/resolv/getaddrinfo_a.c new file mode 100644 index 0000000..1a077d1 --- /dev/null +++ b/resolv/getaddrinfo_a.c @@ -0,0 +1,168 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library 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 C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <errno.h> +#include <netdb.h> +#include <pthread.h> +#include <stdlib.h> +#include <unistd.h> + +#include "gai_misc.h" + + +/* We need this special structure to handle asynchronous I/O. */ +struct async_waitlist + { + int counter; + struct sigevent sigev; + struct waitlist list[0]; + }; + + +int +getaddrinfo_a (int mode, struct gaicb *list[], int ent, struct sigevent *sig) +{ + struct sigevent defsigev; + struct requestlist *requests[ent]; + int cnt; + volatile int total = 0; + int result = 0; + + /* Check arguments. */ + if (mode != GAI_WAIT && mode != GAI_NOWAIT) + { + __set_errno (EINVAL); + return EAI_SYSTEM; + } + + if (sig == NULL) + { + defsigev.sigev_notify = SIGEV_NONE; + sig = &defsigev; + } + + /* Request the mutex. */ + pthread_mutex_lock (&__gai_requests_mutex); + + /* Now we can enqueue all requests. Since we already acquired the + mutex the enqueue function need not do this. */ + for (cnt = 0; cnt < ent; ++cnt) + if (list[cnt] != NULL) + { + requests[cnt] = __gai_enqueue_request (list[cnt]); + + if (requests[cnt] != NULL) + /* Successfully enqueued. */ + ++total; + else + /* Signal that we've seen an error. `errno' and the error code + of the gaicb will tell more. */ + result = EAI_SYSTEM; + } + else + requests[cnt] = NULL; + + if (total == 0) + { + /* We don't have anything to do except signalling if we work + asynchronously. */ + + /* Release the mutex. We do this before raising a signal since the + signal handler might do a `siglongjmp' and then the mutex is + locked forever. */ + pthread_mutex_unlock (&__gai_requests_mutex); + + if (mode == GAI_NOWAIT) + __gai_notify_only (sig, + sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0); + + return result; + } + else if (mode == GAI_WAIT) + { + pthread_cond_t cond = PTHREAD_COND_INITIALIZER; + struct waitlist waitlist[ent]; + int oldstate; + + total = 0; + for (cnt = 0; cnt < ent; ++cnt) + if (requests[cnt] != NULL) + { + waitlist[cnt].cond = &cond; + waitlist[cnt].next = requests[cnt]->waiting; + waitlist[cnt].counterp = &total; + waitlist[cnt].sigevp = NULL; + waitlist[cnt].caller_pid = 0; /* Not needed. */ + requests[cnt]->waiting = &waitlist[cnt]; + ++total; + } + + /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation + points we must be careful. We added entries to the waiting lists + which we must remove. So defer cancelation for now. */ + pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate); + + while (total > 0) + pthread_cond_wait (&cond, &__gai_requests_mutex); + + /* Now it's time to restore the cancelation state. */ + pthread_setcancelstate (oldstate, NULL); + + /* Release the conditional variable. */ + if (pthread_cond_destroy (&cond) != 0) + /* This must never happen. */ + abort (); + } + else + { + struct async_waitlist *waitlist; + + waitlist = (struct async_waitlist *) + malloc (sizeof (struct async_waitlist) + + (ent * sizeof (struct waitlist))); + + if (waitlist == NULL) + result = EAI_AGAIN; + else + { + pid_t caller_pid = sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0; + total = 0; + + for (cnt = 0; cnt < ent; ++cnt) + if (requests[cnt] != NULL) + { + waitlist->list[cnt].cond = NULL; + waitlist->list[cnt].next = requests[cnt]->waiting; + waitlist->list[cnt].counterp = &waitlist->counter; + waitlist->list[cnt].sigevp = &waitlist->sigev; + waitlist->list[cnt].caller_pid = caller_pid; + requests[cnt]->waiting = &waitlist->list[cnt]; + ++total; + } + + waitlist->counter = total; + waitlist->sigev = *sig; + } + } + + /* Release the mutex. */ + pthread_mutex_unlock (&__gai_requests_mutex); + + return result; +} diff --git a/resolv/netdb.h b/resolv/netdb.h index ae3f95a..79c147e 100644 --- a/resolv/netdb.h +++ b/resolv/netdb.h @@ -33,6 +33,11 @@ # include <rpc/netdb.h> #endif +#ifdef __USE_GNU +# define __need_sigevent_t +# include <bits/siginfo.h> +#endif + #include <bits/netdb.h> /* Absolute file name for network data base files. */ @@ -412,23 +417,48 @@ struct addrinfo struct addrinfo *ai_next; /* Pointer to next in list. */ }; +# ifdef __USE_GNU +/* Structure used as control block for asynchronous lookup. */ +struct gaicb +{ + const char *ar_name; /* Name to look up. */ + const char *ar_service; /* Service name. */ + const struct addrinfo *ar_request; /* Additional request specification. */ + struct addrinfo *ar_result; /* Pointer to result. */ + /* The following are internal elements. */ + int __return; + int __unused[5]; +}; + +/* Lookup mode. */ +# define GAI_WAIT 0 +# define GAI_NOWAIT 1 +# endif + /* Possible values for `ai_flags' field in `addrinfo' structure. */ # define AI_PASSIVE 0x0001 /* Socket address is intended for `bind'. */ # define AI_CANONNAME 0x0002 /* Request for canonical name. */ # define AI_NUMERICHOST 0x0004 /* Don't use name resolution. */ /* Error values for `getaddrinfo' function. */ -# define EAI_BADFLAGS -1 /* Invalid value for `ai_flags' field. */ -# define EAI_NONAME -2 /* NAME or SERVICE is unknown. */ -# define EAI_AGAIN -3 /* Temporary failure in name resolution. */ -# define EAI_FAIL -4 /* Non-recoverable failure in name res. */ -# define EAI_NODATA -5 /* No address associated with NAME. */ -# define EAI_FAMILY -6 /* `ai_family' not supported. */ -# define EAI_SOCKTYPE -7 /* `ai_socktype' not supported. */ -# define EAI_SERVICE -8 /* SERVICE not supported for `ai_socktype'. */ -# define EAI_ADDRFAMILY -9 /* Address family for NAME not supported. */ -# define EAI_MEMORY -10 /* Memory allocation failure. */ -# define EAI_SYSTEM -11 /* System error returned in `errno'. */ +# define EAI_BADFLAGS -1 /* Invalid value for `ai_flags' field. */ +# define EAI_NONAME -2 /* NAME or SERVICE is unknown. */ +# define EAI_AGAIN -3 /* Temporary failure in name resolution. */ +# define EAI_FAIL -4 /* Non-recoverable failure in name res. */ +# define EAI_NODATA -5 /* No address associated with NAME. */ +# define EAI_FAMILY -6 /* `ai_family' not supported. */ +# define EAI_SOCKTYPE -7 /* `ai_socktype' not supported. */ +# define EAI_SERVICE -8 /* SERVICE not supported for `ai_socktype'. */ +# define EAI_ADDRFAMILY -9 /* Address family for NAME not supported. */ +# define EAI_MEMORY -10 /* Memory allocation failure. */ +# define EAI_SYSTEM -11 /* System error returned in `errno'. */ +# ifdef __USE_GNU +# define EAI_INPROGRESS -100 /* Processing request in progress. */ +# define EAI_CANCELED -101 /* Request canceled. */ +# define EAI_NOTCANCELED -102 /* Request not canceled. */ +# define EAI_ALLDONE -103 /* All requests done. */ +# define EAI_INTR -104 /* Interrupted by a signal. */ +# endif # define NI_MAXHOST 1025 # define NI_MAXSERV 32 @@ -458,6 +488,26 @@ extern int getnameinfo (__const struct sockaddr *__restrict __sa, socklen_t __hostlen, char *__restrict __serv, socklen_t __servlen, unsigned int __flags) __THROW; +# ifdef __USE_GNU +/* Enqueue ENT requests from the LIST. If MODE is GAI_WAIT wait until all + requests are handled. If WAIT is GAI_NOWAIT return immediately after + queueing the requests and signal completion according to SIG. */ +extern int getaddrinfo_a (int __mode, struct gaicb *__list[__restrict_arr], + int __ent, struct sigevent *__restrict __sig) + __THROW; + +/* Suspend execution of the thread until at least one of the ENT requests + in LIST is handled. If TIMEOUT is not a null pointer it specifies the + longest time the function keeps waiting before returning with an error. */ +extern int gai_suspend (__const struct gaicb *__const __list[], int __ent, + const struct timespec *__timeout) __THROW; + +/* Get the error status of the request REQ. */ +extern int gai_error (struct gaicb *__req) __THROW; + +/* Cancel the requests associated with GAICBP. */ +extern int gai_cancel (struct gaicb *__gaicbp) __THROW; +# endif /* GNU */ #endif /* POSIX */ __END_DECLS |