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/* |
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* Copyright (C) 2002 Nikos Mavroyanopoulos |
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* |
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* This file is part of BOA webserver. |
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* |
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* Hydra is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* Hydra 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 |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
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*/ |
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|
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#include "boa.h" |
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#include <signal.h> /* signal */ |
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|
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/* Hydra Internally handled CGIs (HIC HIC) |
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* |
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* How does it work? |
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* |
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* A special thread (maybe more than one), is used for CGIs. This tread |
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* uses one pipe to communicate with the others via hic_send_command(). |
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* |
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* If a request for a HIC file arrives, the server goes as a normal CGI |
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* creates a pipe, but does not fork. It enqueues a hic_request |
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* for this (HIC) thread, and sends a SIGUSR2 signal. The HIC thread is then |
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* waken up, and handles all pending requests. |
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* |
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* The HIC thread, when receives the message, parses the CGIs, |
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* one CGI at the time, and sends the output to fd. |
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* |
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* The benefit is that in no case the server is blocked. We may have |
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* a performance problem, if the server only uses parsed CGIs. |
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* |
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*/ |
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|
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#ifdef ENABLE_HIC |
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|
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#include "hic.h" |
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|
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#ifdef ENABLE_SMP |
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pthread_mutex_t hic_lock = PTHREAD_MUTEX_INITIALIZER; |
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#endif |
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|
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typedef struct _hic_request { |
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struct _hic_request *next; |
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struct _hic_request *prev; |
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hic_stuff command; |
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} hic_request; |
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|
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hic_request * hic_request_head = NULL; |
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|
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static int process_hic_request(hic_request * cmd); |
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void hic_dequeue(hic_request ** head, hic_request * req); |
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void hic_enqueue(hic_request ** head, hic_request * req); |
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int hic_sigchld_flag = 0; /* if we received a SIGCHLD signal, then this flag |
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* is non zero */ |
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|
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void *hic_main_loop(void *cml) |
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{ |
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hic_request* current, *next; |
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|
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while (1) { |
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for (current = hic_request_head;current;current=next) { |
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|
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#ifdef ENABLE_SMP |
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pthread_mutex_lock(&hic_lock); |
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#endif |
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next = current->next; |
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#ifdef ENABLE_SMP |
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pthread_mutex_unlock(&hic_lock); |
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#endif |
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|
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if (process_hic_request( current) == -1) { |
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log_error_time(); |
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fprintf(stderr, "hic: Error while processing command.\n"); |
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exit(1); |
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} |
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} |
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|
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/* If somebody sends a command, then he should |
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* send a sigusr2 as well. |
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*/ |
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unblock_sigusr2(); |
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if (!hic_request_head) pause(); |
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block_sigusr2(); |
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|
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if (hic_sigchld_flag) |
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sigchld_run(); |
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|
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|
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} |
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|
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} |
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|
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static int process_hic_request(hic_request * req) |
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{ |
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hic_module_st *hst; |
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hic_stuff* cmd = &req->command; |
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|
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#ifdef ENABLE_SMP |
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pthread_mutex_lock(&hic_lock); |
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#endif |
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hic_dequeue( &hic_request_head, req); |
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#ifdef ENABLE_SMP |
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pthread_mutex_unlock(&hic_lock); |
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#endif |
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|
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hst = find_hic_appr_module(get_mime_type(cmd->path_translated), 0); |
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if (hst == NULL) { |
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log_error_time(); |
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fprintf(stderr, "Could not find HIC handler for '%s'\n", |
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cmd->path_translated); |
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close(cmd->out_fd); |
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free( req); |
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return 0; |
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} |
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|
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hst->request(cmd); |
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close(cmd->out_fd); |
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free( req); |
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|
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/* |
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log_error_time(); |
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fprintf(stderr, "HIC status: %d wrote: %d\n", cmd->status, cmd->bytes_sent); |
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*/ |
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|
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return 0; |
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} |
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|
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/* Sends a command to a HIC thread. |
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*/ |
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int hic_send_command(request * req, int out_fd) |
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{ |
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hic_request *x; |
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|
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x = malloc( sizeof( hic_request)); |
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if (x==NULL) |
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return -1; |
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|
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x->next = x->prev = NULL; |
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x->command.cgi_env = req->cgi_env; |
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x->command.cgi_env_max = req->cgi_env_index; |
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x->command.one_one = 0; |
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x->command.post_data_fd = req->post_data_fd; |
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x->command.out_fd = out_fd; |
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x->command.request_uri = req->request_uri; |
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x->command.path_translated = req->path_translated; |
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|
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#ifdef ENABLE_SMP |
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pthread_mutex_lock(&hic_lock); |
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#endif |
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|
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hic_enqueue( &hic_request_head, x); |
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#ifdef ENABLE_SMP |
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/* Notify the main loop */ |
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pthread_kill( hic_tid, SIGUSR2); |
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#endif |
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|
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#ifdef ENABLE_SMP |
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pthread_mutex_unlock(&hic_lock); |
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#endif |
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|
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return 1; |
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|
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} |
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|
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/* Implement a basic queue for HIC stuff. This is created after |
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* queue.c. |
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*/ |
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|
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#include "queue.h" |
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|
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ENQUEUE_FUNCTION( hic_enqueue, hic_request) |
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DEQUEUE_FUNCTION( hic_dequeue, hic_request) |
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|
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#endif /* ENABLE_HIC */ |