/[hydra]/hydra/src/select.c
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Annotation of /hydra/src/select.c

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Revision 1.2 - (hide annotations)
Mon Sep 23 17:56:41 2002 UTC (21 years, 6 months ago) by nmav
Branch: MAIN
Changes since 1.1: +9 -3 lines
File MIME type: text/plain
Fixes in configure script. Added support for the TCP_CORK tcp option in linux systems.

1 nmav 1.1 /*
2     * Boa, an http server
3     * Copyright (C) 1995 Paul Phillips <paulp@go2net.com>
4     * Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com>
5     * Some changes Copyright (C) 1996 Larry Doolittle <ldoolitt@boa.org>
6     * Some changes Copyright (C) 1996-2002 Jon Nelson <jnelson@boa.org>
7     * Portions Copyright (C) 2002 Nikos Mavroyanopoulos <nmav@gnutls.org>
8     *
9     * This program is free software; you can redistribute it and/or modify
10     * it under the terms of the GNU General Public License as published by
11     * the Free Software Foundation; either version 1, or (at your option)
12     * any later version.
13     *
14     * This program is distributed in the hope that it will be useful,
15     * but WITHOUT ANY WARRANTY; without even the implied warranty of
16     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17     * GNU General Public License for more details.
18     *
19     * You should have received a copy of the GNU General Public License
20     * along with this program; if not, write to the Free Software
21     * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22     *
23     */
24    
25 nmav 1.2 /* $Id: select.c,v 1.1.1.1 2002/09/21 13:53:46 nmav Exp $*/
26 nmav 1.1
27     #include "boa.h"
28     #ifdef ENABLE_SMP
29     # include <pthread.h>
30    
31     extern pthread_t father_id;
32    
33     #endif
34    
35     static void fdset_update( server_params *);
36    
37     /* params->server_s[0] is the plain socket, while the
38     * params->server_s[1] is the ssl one.
39     */
40     void* select_loop(void* _params)
41     {
42     server_params* params = _params;
43    
44     #ifdef ENABLE_SMP
45     pthread_setcancelstate( PTHREAD_CANCEL_ENABLE, NULL);
46     pthread_setcanceltype( PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
47     #endif
48    
49     FD_ZERO(&params->block_read_fdset);
50     FD_ZERO(&params->block_write_fdset);
51     /* set server_s and req_timeout */
52     params->req_timeout.tv_sec = (ka_timeout ? ka_timeout : REQUEST_TIMEOUT);
53     params->req_timeout.tv_usec = 0l; /* reset timeout */
54    
55     /* preset max_fd */
56     params->max_fd = -1;
57    
58     while (1) {
59     #ifdef ENABLE_SMP
60     /* Only the main thread handles signals.
61     */
62     if (pthread_equal( params->tid, father_id)) {
63     #endif
64     if (params->sighup_flag)
65     sighup_run();
66     if (params->sigchld_flag)
67     sigchld_run();
68     if (params->sigalrm_flag)
69     sigalrm_run();
70     if (params->sigusr1_flag)
71     sigusr1_run();
72    
73     if (params->sigterm_flag) {
74     if (params->sigterm_flag == 1) {
75     sigterm_stage1_run();
76     }
77     if (params->sigterm_flag == 2 && !params->request_ready && !params->request_block) {
78     sigterm_stage2_run();
79     }
80     }
81     #ifdef ENABLE_SMP
82     }
83     #endif
84    
85     /* reset max_fd */
86     params->max_fd = -1;
87    
88     if (params->request_block)
89     /* move selected req's from request_block to request_ready */
90     fdset_update( params);
91    
92     /* any blocked req's move from request_ready to request_block */
93 nmav 1.2 if (params->server_s[0].socket != -1) process_requests(params, &params->server_s[0]);
94     #ifdef ENABLE_SSL
95     if (params->server_s[1].socket != -1) process_requests(params, &params->server_s[1]);
96     #endif
97 nmav 1.1
98     if (!params->sigterm_flag && params->total_connections < (max_connections - 10)) {
99     if (params->server_s[0].socket != -1) BOA_FD_SET(params->server_s[0].socket, &params->block_read_fdset); /* server always set */
100 nmav 1.2 #ifdef ENABLE_SSL
101 nmav 1.1 if (params->server_s[1].socket != -1) BOA_FD_SET(params->server_s[1].socket, &params->block_read_fdset); /* server always set */
102 nmav 1.2 #endif
103 nmav 1.1 }
104    
105     params->req_timeout.tv_sec = ((params->request_ready) ? 0 :
106     (ka_timeout ? ka_timeout : REQUEST_TIMEOUT));
107     params->req_timeout.tv_usec = 0l; /* reset timeout */
108    
109     if (select(params->max_fd + 1, &params->block_read_fdset,
110     &params->block_write_fdset, NULL,
111     ((params->request_ready || params->request_block) ? &params->req_timeout : NULL)) == -1) {
112     /* what is the appropriate thing to do here on EBADF */
113     if (errno == EINTR)
114     continue; /* while(1) */
115     else if (errno != EBADF) {
116     DIE("select");
117     }
118     }
119    
120     time(&current_time);
121     if (params->server_s[0].socket != -1 && FD_ISSET(params->server_s[0].socket, &params->block_read_fdset))
122     params->server_s[0].pending_requests = 1;
123 nmav 1.2 #ifdef ENABLE_SSL
124 nmav 1.1 if (params->server_s[1].socket != -1 && FD_ISSET(params->server_s[1].socket, &params->block_read_fdset))
125     params->server_s[1].pending_requests = 1;
126 nmav 1.2 #endif
127 nmav 1.1 }
128    
129     return NULL;
130     }
131    
132     /*
133     * Name: fdset_update
134     *
135     * Description: iterate through the blocked requests, checking whether
136     * that file descriptor has been set by select. Update the fd_set to
137     * reflect current status.
138     *
139     * Here, we need to do some things:
140     * - keepalive timeouts simply close
141     * (this is special:: a keepalive timeout is a timeout where
142     keepalive is active but nothing has been read yet)
143     * - regular timeouts close + error
144     * - stuff in buffer and fd ready? write it out
145     * - fd ready for other actions? do them
146     */
147    
148     static void fdset_update( server_params* params)
149     {
150     request *current, *next;
151    
152     for(current = params->request_block;current;current = next) {
153     time_t time_since = current_time - current->time_last;
154     next = current->next;
155    
156     /* hmm, what if we are in "the middle" of a request and not
157     * just waiting for a new one... perhaps check to see if anything
158     * has been read via header position, etc... */
159     if (current->kacount < ka_max && /* we *are* in a keepalive */
160     (time_since >= ka_timeout) && /* ka timeout */
161     !current->logline) /* haven't read anything yet */
162     current->status = DEAD; /* connection keepalive timed out */
163     else if (time_since > REQUEST_TIMEOUT) {
164     log_error_doc(current);
165     fputs("connection timed out\n", stderr);
166     current->status = DEAD;
167     }
168     if (current->buffer_end && current->status < DEAD) {
169     if (FD_ISSET(current->fd, &params->block_write_fdset))
170     ready_request( params, current);
171     else {
172     BOA_FD_SET(current->fd, &params->block_write_fdset);
173     }
174     } else {
175     switch (current->status) {
176     case WRITE:
177     case PIPE_WRITE:
178     if (FD_ISSET(current->fd, &params->block_write_fdset))
179     ready_request( params, current);
180     else {
181     BOA_FD_SET(current->fd, &params->block_write_fdset);
182     }
183     break;
184     case BODY_WRITE:
185     if (FD_ISSET(current->post_data_fd, &params->block_write_fdset))
186     ready_request( params, current);
187     else {
188     BOA_FD_SET(current->post_data_fd, &params->block_write_fdset);
189     }
190     break;
191     case PIPE_READ:
192     if (FD_ISSET(current->data_fd, &params->block_read_fdset))
193     ready_request( params, current);
194     else {
195     BOA_FD_SET(current->data_fd, &params->block_read_fdset);
196     }
197     break;
198     case DONE:
199     if (FD_ISSET(current->fd, &params->block_write_fdset))
200     ready_request( params, current);
201     else {
202     BOA_FD_SET(current->fd, &params->block_write_fdset);
203     }
204     break;
205     case DEAD:
206     ready_request( params, current);
207     break;
208     default:
209     if (FD_ISSET(current->fd, &params->block_read_fdset))
210     ready_request( params, current);
211     else {
212     BOA_FD_SET(current->fd, &params->block_read_fdset);
213     }
214     break;
215     }
216     }
217     current = next;
218     }
219     }
220    

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