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/* lookup.c - Performing name lookup with getaddrinfo
*
* Copyright (C) 2004, 2005 Oskar Liljeblad
*
* This program is free software; 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.
*
* This program 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 General Public License along
* with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include "gettext.h" /* Gnulib/GNU gettext */
#define _(s) gettext(s)
#define N_(s) gettext_noop(s)
#include "xalloc.h" /* Gnulib */
#include "xvasprintf.h" /* Gnulib */
#include "common/msgq.h"
#include "common/byteq.h"
#include "common/ptrv.h"
#include "microdc.h"
#include "tth/tth.h"
MsgQ *hash_request_mq = NULL;
MsgQ *hash_result_mq = NULL;
pid_t hash_child;
static void
__attribute__((noreturn))
hash_main(int request_fd[2], int result_fd[2])
{
MsgQ *request_mq;
MsgQ *result_mq;
struct sigaction sigact;
close(request_fd[1]);
close(result_fd[0]);
request_mq = msgq_new(request_fd[0]);
result_mq = msgq_new(result_fd[1]);
/* Inability to register these signals is not a fatal error. */
sigact.sa_flags = SA_RESTART;
sigact.sa_handler = SIG_IGN;
#ifdef HAVE_STRUCT_SIGACTION_SA_RESTORER
sigact.sa_restorer = NULL;
#endif
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
sigaction(SIGUSR1, &sigact, NULL);
sigaction(SIGCHLD, &sigact, NULL);
sigaction(SIGPIPE, &sigact, NULL);
while (msgq_read_complete_msg(request_mq) > 0) {
char *filename, *hash;
struct stat st;
msgq_get(request_mq, MSGQ_STR, &filename, MSGQ_END);
/*
fprintf(stderr, "HASH: begin processing %s\n", filename);
fflush(stderr);
*/
if (stat(filename, &st) < 0) {
hash = xasprintf("FAILED");
} else {
char* tthl = NULL;
size_t tthl_size;
hash = tth(filename, &tthl, &tthl_size);
if (tthl != NULL)
free(tthl);
}
/*
fprintf(stderr, "HASH: %s: %s\n", filename, hash);
fflush(stderr);
*/
msgq_put(result_mq, MSGQ_STR, hash, MSGQ_END);
free(hash);
if (msgq_write_all(result_mq) < 0) {
/*
fprintf(stderr, "HASH: msgq_write_all error: %d, %s\n", errno, errstr);
fflush(stderr);
*/
break;
}
}
/* msgq_read_complete_msg may have failed if it returned < 0.
* But we can't print any errors from this process (it would
* interfere with the readline-managed display, so just exit
* gracefully.
*/
msgq_free(request_mq);
msgq_free(result_mq);
close(request_fd[0]);
close(result_fd[1]);
exit(EXIT_SUCCESS);
}
bool
hash_init(void)
{
int request_fd[2];
int result_fd[2];
if (pipe(request_fd) != 0 || pipe(result_fd) != 0) {
warn(_("Cannot create pipe pair - %s\n"), errstr);
return false;
}
if (!fd_set_nonblock_flag(request_fd[1], true)
|| !fd_set_nonblock_flag(result_fd[0], true)) {
warn(_("Cannot set non-blocking flag - %s\n"), errstr);
return false;
}
hash_child = fork();
if (hash_child < 0) {
warn(_("Cannot create process - %s\n"), errstr);
return false;
}
if (hash_child == 0) {
setpriority(PRIO_PROCESS, 0, 16);
hash_main(request_fd, result_fd);
}
close(request_fd[0]);
close(result_fd[1]);
hash_request_mq = msgq_new(request_fd[1]);
hash_result_mq = msgq_new(result_fd[0]);
return true;
}
void
hash_finish(void)
{
if (hash_request_mq != NULL) {
close(hash_request_mq->fd);
msgq_free(hash_request_mq);
}
if (hash_result_mq != NULL) {
close(hash_result_mq->fd);
msgq_free(hash_result_mq);
}
}
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