summaryrefslogtreecommitdiff
path: root/dpmert/sentserver.c
diff options
context:
space:
mode:
Diffstat (limited to 'dpmert/sentserver.c')
-rw-r--r--dpmert/sentserver.c515
1 files changed, 0 insertions, 515 deletions
diff --git a/dpmert/sentserver.c b/dpmert/sentserver.c
deleted file mode 100644
index c20b4fa6..00000000
--- a/dpmert/sentserver.c
+++ /dev/null
@@ -1,515 +0,0 @@
-/* Copyright (c) 2001 by David Chiang. All rights reserved.*/
-
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <netinet/in.h>
-#include <sched.h>
-#include <pthread.h>
-#include <errno.h>
-
-#include "sentserver.h"
-
-#define MAX_CLIENTS 64
-
-struct clientinfo {
- int s;
- struct sockaddr_in sin;
-};
-
-struct line {
- int id;
- char *s;
- int status;
- struct line *next;
-} *head, **ptail;
-
-int n_sent = 0, n_received=0, n_flushed=0;
-
-#define STATUS_RUNNING 0
-#define STATUS_ABORTED 1
-#define STATUS_FINISHED 2
-
-pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
-pthread_mutex_t clients_mutex = PTHREAD_MUTEX_INITIALIZER;
-pthread_mutex_t input_mutex = PTHREAD_MUTEX_INITIALIZER;
-
-int n_clients = 0;
-int s;
-int expect_multiline_output = 0;
-int log_mutex = 0;
-int stay_alive = 0; /* dont panic and die with zero clients */
-
-void queue_finish(struct line *node, char *s, int fid);
-char * read_line(int fd, int multiline);
-void done (int code);
-
-struct line * queue_get(int fid) {
- struct line *cur;
- char *s, *synch;
-
- if (log_mutex) fprintf(stderr, "Getting for data for fid %d\n", fid);
- if (log_mutex) fprintf(stderr, "Locking queue mutex (%d)\n", fid);
- pthread_mutex_lock(&queue_mutex);
-
- /* First, check for aborted sentences. */
-
- if (log_mutex) fprintf(stderr, " Checking queue for aborted jobs (fid %d)\n", fid);
- for (cur = head; cur != NULL; cur = cur->next) {
- if (cur->status == STATUS_ABORTED) {
- cur->status = STATUS_RUNNING;
-
- if (log_mutex) fprintf(stderr, "Unlocking queue mutex (%d)\n", fid);
- pthread_mutex_unlock(&queue_mutex);
-
- return cur;
- }
- }
- if (log_mutex) fprintf(stderr, "Unlocking queue mutex (%d)\n", fid);
- pthread_mutex_unlock(&queue_mutex);
-
- /* Otherwise, read a new one. */
- if (log_mutex) fprintf(stderr, "Locking input mutex (%d)\n", fid);
- if (log_mutex) fprintf(stderr, " Reading input for new data (fid %d)\n", fid);
- pthread_mutex_lock(&input_mutex);
- s = read_line(0,0);
-
- while (s) {
- if (log_mutex) fprintf(stderr, "Locking queue mutex (%d)\n", fid);
- pthread_mutex_lock(&queue_mutex);
- if (log_mutex) fprintf(stderr, "Unlocking input mutex (%d)\n", fid);
- pthread_mutex_unlock(&input_mutex);
-
- cur = malloc(sizeof (struct line));
- cur->id = n_sent;
- cur->s = s;
- cur->next = NULL;
-
- *ptail = cur;
- ptail = &cur->next;
-
- n_sent++;
-
- if (strcmp(s,"===SYNCH===\n")==0){
- fprintf(stderr, "Received ===SYNCH=== signal (fid %d)\n", fid);
- // Note: queue_finish calls free(cur->s).
- // Therefore we need to create a new string here.
- synch = malloc((strlen("===SYNCH===\n")+2) * sizeof (char));
- synch = strcpy(synch, s);
-
- if (log_mutex) fprintf(stderr, "Unlocking queue mutex (%d)\n", fid);
- pthread_mutex_unlock(&queue_mutex);
- queue_finish(cur, synch, fid); /* handles its own lock */
-
- if (log_mutex) fprintf(stderr, "Locking input mutex (%d)\n", fid);
- if (log_mutex) fprintf(stderr, " Reading input for new data (fid %d)\n", fid);
- pthread_mutex_lock(&input_mutex);
-
- s = read_line(0,0);
- } else {
- if (log_mutex) fprintf(stderr, " Received new data %d (fid %d)\n", cur->id, fid);
- cur->status = STATUS_RUNNING;
- if (log_mutex) fprintf(stderr, "Unlocking queue mutex (%d)\n", fid);
- pthread_mutex_unlock(&queue_mutex);
- return cur;
- }
- }
-
- if (log_mutex) fprintf(stderr, "Unlocking input mutex (%d)\n", fid);
- pthread_mutex_unlock(&input_mutex);
- /* Only way to reach this point: no more output */
-
- if (log_mutex) fprintf(stderr, "Locking queue mutex (%d)\n", fid);
- pthread_mutex_lock(&queue_mutex);
- if (head == NULL) {
- fprintf(stderr, "Reached end of file. Exiting.\n");
- done(0);
- } else
- ptail = NULL; /* This serves as a signal that there is no more input */
- if (log_mutex) fprintf(stderr, "Unlocking queue mutex (%d)\n", fid);
- pthread_mutex_unlock(&queue_mutex);
-
- return NULL;
-}
-
-void queue_panic() {
- struct line *next;
- while (head && head->status == STATUS_FINISHED) {
- /* Write out finished sentences */
- if (head->status == STATUS_FINISHED) {
- fputs(head->s, stdout);
- fflush(stdout);
- }
- /* Write out blank line for unfinished sentences */
- if (head->status == STATUS_ABORTED) {
- fputs("\n", stdout);
- fflush(stdout);
- }
- /* By defition, there cannot be any RUNNING sentences, since
- function is only called when n_clients == 0 */
- free(head->s);
- next = head->next;
- free(head);
- head = next;
- n_flushed++;
- }
- fclose(stdout);
- fprintf(stderr, "All clients died. Panicking, flushing completed sentences and exiting.\n");
- done(1);
-}
-
-void queue_abort(struct line *node, int fid) {
- if (log_mutex) fprintf(stderr, "Locking queue mutex (%d)\n", fid);
- pthread_mutex_lock(&queue_mutex);
- node->status = STATUS_ABORTED;
- if (n_clients == 0) {
- if (stay_alive) {
- fprintf(stderr, "Warning! No live clients detected! Staying alive, will retry soon.\n");
- } else {
- queue_panic();
- }
- }
- if (log_mutex) fprintf(stderr, "Unlocking queue mutex (%d)\n", fid);
- pthread_mutex_unlock(&queue_mutex);
-}
-
-
-void queue_print() {
- struct line *cur;
-
- fprintf(stderr, " Queue\n");
-
- for (cur = head; cur != NULL; cur = cur->next) {
- switch(cur->status) {
- case STATUS_RUNNING:
- fprintf(stderr, " %d running ", cur->id); break;
- case STATUS_ABORTED:
- fprintf(stderr, " %d aborted ", cur->id); break;
- case STATUS_FINISHED:
- fprintf(stderr, " %d finished ", cur->id); break;
-
- }
- fprintf(stderr, "\n");
- //fprintf(stderr, cur->s);
- }
-}
-
-void queue_finish(struct line *node, char *s, int fid) {
- struct line *next;
- if (log_mutex) fprintf(stderr, "Locking queue mutex (%d)\n", fid);
- pthread_mutex_lock(&queue_mutex);
-
- free(node->s);
- node->s = s;
- node->status = STATUS_FINISHED;
- n_received++;
-
- /* Flush out finished nodes */
- while (head && head->status == STATUS_FINISHED) {
-
- if (log_mutex) fprintf(stderr, " Flushing finished node %d\n", head->id);
-
- fputs(head->s, stdout);
- fflush(stdout);
- if (log_mutex) fprintf(stderr, " Flushed node %d\n", head->id);
- free(head->s);
-
- next = head->next;
- free(head);
-
- head = next;
-
- n_flushed++;
-
- if (head == NULL) { /* empty queue */
- if (ptail == NULL) { /* This can only happen if set in queue_get as signal that there is no more input. */
- fprintf(stderr, "All sentences finished. Exiting.\n");
- done(0);
- } else /* ptail pointed at something which was just popped off the stack -- reset to head*/
- ptail = &head;
- }
- }
-
- if (log_mutex) fprintf(stderr, " Flushing output %d\n", head->id);
- fflush(stdout);
- fprintf(stderr, "%d sentences sent, %d sentences finished, %d sentences flushed\n", n_sent, n_received, n_flushed);
-
- if (log_mutex) fprintf(stderr, "Unlocking queue mutex (%d)\n", fid);
- pthread_mutex_unlock(&queue_mutex);
-
-}
-
-char * read_line(int fd, int multiline) {
- int size = 80;
- char errorbuf[100];
- char *s = malloc(size+2);
- int result, errors=0;
- int i = 0;
-
- result = read(fd, s+i, 1);
-
- while (1) {
- if (result < 0) {
- perror("read()");
- sprintf(errorbuf, "Error code: %d\n", errno);
- fprintf(stderr, errorbuf);
- errors++;
- if (errors > 5) {
- free(s);
- return NULL;
- } else {
- sleep(1); /* retry after delay */
- }
- } else if (result == 0) {
- break;
- } else if (multiline==0 && s[i] == '\n') {
- break;
- } else {
- if (s[i] == '\n'){
- /* if we've reached this point,
- then multiline must be 1, and we're
- going to poll the fd for an additional
- line of data. The basic design is to
- run a select on the filedescriptor fd.
- Select will return under two conditions:
- if there is data on the fd, or if a
- timeout is reached. We'll select on this
- fd. If select returns because there's data
- ready, keep going; else assume there's no
- more and return the data we already have.
- */
-
- fd_set set;
- FD_ZERO(&set);
- FD_SET(fd, &set);
-
- struct timeval timeout;
- timeout.tv_sec = 3; // number of seconds for timeout
- timeout.tv_usec = 0;
-
- int ready = select(FD_SETSIZE, &set, NULL, NULL, &timeout);
- if (ready<1){
- break; // no more data, stop looping
- }
- }
- i++;
-
- if (i == size) {
- size = size*2;
- s = realloc(s, size+2);
- }
- }
-
- result = read(fd, s+i, 1);
- }
-
- if (result == 0 && i == 0) { /* end of file */
- free(s);
- return NULL;
- }
-
- s[i] = '\n';
- s[i+1] = '\0';
-
- return s;
-}
-
-void * new_client(void *arg) {
- struct clientinfo *client = (struct clientinfo *)arg;
- struct line *cur;
- int result;
- char *s;
- char errorbuf[100];
-
- pthread_mutex_lock(&clients_mutex);
- n_clients++;
- pthread_mutex_unlock(&clients_mutex);
-
- fprintf(stderr, "Client connected (%d connected)\n", n_clients);
-
- for (;;) {
-
- cur = queue_get(client->s);
-
- if (cur) {
- /* fprintf(stderr, "Sending to client: %s", cur->s); */
- fprintf(stderr, "Sending data %d to client (fid %d)\n", cur->id, client->s);
- result = write(client->s, cur->s, strlen(cur->s));
- if (result < strlen(cur->s)){
- perror("write()");
- sprintf(errorbuf, "Error code: %d\n", errno);
- fprintf(stderr, errorbuf);
-
- pthread_mutex_lock(&clients_mutex);
- n_clients--;
- pthread_mutex_unlock(&clients_mutex);
-
- fprintf(stderr, "Client died (%d connected)\n", n_clients);
- queue_abort(cur, client->s);
-
- close(client->s);
- free(client);
-
- pthread_exit(NULL);
- }
- } else {
- close(client->s);
- pthread_mutex_lock(&clients_mutex);
- n_clients--;
- pthread_mutex_unlock(&clients_mutex);
- fprintf(stderr, "Client dismissed (%d connected)\n", n_clients);
- pthread_exit(NULL);
- }
-
- s = read_line(client->s,expect_multiline_output);
- if (s) {
- /* fprintf(stderr, "Client (fid %d) returned: %s", client->s, s); */
- fprintf(stderr, "Client (fid %d) returned data %d\n", client->s, cur->id);
-// queue_print();
- queue_finish(cur, s, client->s);
- } else {
- pthread_mutex_lock(&clients_mutex);
- n_clients--;
- pthread_mutex_unlock(&clients_mutex);
-
- fprintf(stderr, "Client died (%d connected)\n", n_clients);
- queue_abort(cur, client->s);
-
- close(client->s);
- free(client);
-
- pthread_exit(NULL);
- }
-
- }
- return 0;
-}
-
-void done (int code) {
- close(s);
- exit(code);
-}
-
-
-
-int main (int argc, char *argv[]) {
- struct sockaddr_in sin, from;
- int g;
- socklen_t len;
- struct clientinfo *client;
- int port;
- int opt;
- int errors = 0;
- int argi;
- char *key = NULL, *client_key;
- int use_key = 0;
- /* the key stuff here doesn't provide any
- real measure of security, it's mainly to keep
- jobs from bumping into each other. */
-
- pthread_t tid;
- port = DEFAULT_PORT;
-
- for (argi=1; argi < argc; argi++){
- if (strcmp(argv[argi], "-m")==0){
- expect_multiline_output = 1;
- } else if (strcmp(argv[argi], "-k")==0){
- argi++;
- if (argi == argc){
- fprintf(stderr, "Key must be specified after -k\n");
- exit(1);
- }
- key = argv[argi];
- use_key = 1;
- } else if (strcmp(argv[argi], "--stay-alive")==0){
- stay_alive = 1; /* dont panic and die with zero clients */
- } else {
- port = atoi(argv[argi]);
- }
- }
-
- /* Initialize data structures */
- head = NULL;
- ptail = &head;
-
- /* Set up listener */
- s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- opt = 1;
- setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
-
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = htons(port);
- while (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
- perror("bind()");
- sleep(1);
- errors++;
- if (errors > 100)
- exit(1);
- }
-
- len = sizeof(sin);
- getsockname(s, (struct sockaddr *) &sin, &len);
-
- fprintf(stderr, "Listening on port %hu\n", ntohs(sin.sin_port));
-
- while (listen(s, MAX_CLIENTS) < 0) {
- perror("listen()");
- sleep(1);
- errors++;
- if (errors > 100)
- exit(1);
- }
-
- for (;;) {
- len = sizeof(from);
- g = accept(s, (struct sockaddr *)&from, &len);
- if (g < 0) {
- perror("accept()");
- sleep(1);
- continue;
- }
- client = malloc(sizeof(struct clientinfo));
- client->s = g;
- bcopy(&from, &client->sin, len);
-
- if (use_key){
- fd_set set;
- FD_ZERO(&set);
- FD_SET(client->s, &set);
-
- struct timeval timeout;
- timeout.tv_sec = 3; // number of seconds for timeout
- timeout.tv_usec = 0;
-
- int ready = select(FD_SETSIZE, &set, NULL, NULL, &timeout);
- if (ready<1){
- fprintf(stderr, "Prospective client failed to respond with correct key.\n");
- close(client->s);
- free(client);
- } else {
- client_key = read_line(client->s,0);
- client_key[strlen(client_key)-1]='\0'; /* chop trailing newline */
- if (strcmp(key, client_key)==0){
- pthread_create(&tid, NULL, new_client, client);
- } else {
- fprintf(stderr, "Prospective client failed to respond with correct key.\n");
- close(client->s);
- free(client);
- }
- free(client_key);
- }
- } else {
- pthread_create(&tid, NULL, new_client, client);
- }
- }
-
-}
-
-
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 02:39:50 +0000