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client_protocol.h
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client_protocol.h
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#include<string.h>
#include<signal.h>
#include"shared_pipes.h"
void init_fone_client() {
signal(SIGPIPE, SIG_IGN);
}
/*
* Sends a subscribe and returns a file descriptor to a named pipe
* through which data is communicated through
*/
int send_subscribe(int *in_fd, int *out_fd) {
int fd;
char buf[PIPE_BUF];
char *pipename = calloc(PIPE_NAME_LENGTH, sizeof(char));
/*
* Open ctl pipe to send subscribe and receive
* a data pipe for further communication
*/
fd = open(fa2s_ctl, O_WRONLY);
if(fd < 0) {
fprintf(stderr, "[Error]: Couldn't communicate to ctl\n");
return 1;
}
if(write(fd, "subscribe\n", 10) != 10) {
fprintf(stderr, "[Error]: Couldn't send hello to ctl\n");
return 1;
}
close(fd);
fd = open(fs2a_ctl, O_RDONLY);
if(fd < 0) {
fprintf(stderr, "[Error]: Couldn't communicate to ctl\n");
return 1;
}
if(read(fd, buf, PIPE_BUF) < 0) {
fprintf(stderr, "[Error]: Couldn't read from ctl\n");
return 1;
}
close(fd);
/* Wait for server to create pipes */
sleep(2);
/*
* Construct data pipe names and
* open them for communication
*/
snprintf(pipename, PIPE_NAME_LENGTH, "/tmp/fs2a_");
*in_fd = open(strncat(pipename, buf, 32), O_RDONLY);
if(*in_fd < 0) {
fprintf(stderr, "[Error]: Couldn't open data pipe for reading (%s)\n", pipename);
return 1;
}
snprintf(pipename, PIPE_NAME_LENGTH, "/tmp/fa2s_");
*out_fd = open(strncat(pipename, buf, 32), O_WRONLY);
if(*out_fd < 0) {
fprintf(stderr, "[Error]: Couldn't data pipe for writing (%s)\n", pipename);
return 1;
}
free(pipename);
return 0;
}
/*
* Sends a hello and returns a file descriptor to a named pipe
* through which data is communicated through
*/
int send_hello(int *in_fd, int *out_fd) {
int fd;
char buf[PIPE_BUF];
char *pipename = calloc(PIPE_NAME_LENGTH, sizeof(char));
/*
* Open ctl pipe to send hello and receive
* a data pipe for further communication
*/
fd = open(fa2s_ctl, O_WRONLY);
if(fd < 0) {
fprintf(stderr, "[Error]: Couldn't communicate to ctl\n");
return 1;
}
if(write(fd, "hello\n", 6) != 6) {
fprintf(stderr, "[Error]: Couldn't send hello to ctl\n");
return 1;
}
close(fd);
fd = open(fs2a_ctl, O_RDONLY);
if(fd < 0) {
fprintf(stderr, "[Error]: Couldn't communicate to ctl\n");
return 1;
}
if(read(fd, buf, PIPE_BUF) < 0) {
fprintf(stderr, "[Error]: Couldn't read from ctl\n");
return 1;
}
close(fd);
/* Wait for server to create pipes */
sleep(2);
/*
* Construct data pipe names and
* open them for communication
*/
snprintf(pipename, PIPE_NAME_LENGTH, "/tmp/fs2a_");
*in_fd = open(strncat(pipename, buf, 32), O_RDONLY);
if(*in_fd < 0) {
fprintf(stderr, "[Error]: Couldn't open data pipe for reading (%s)\n", pipename);
return 1;
}
snprintf(pipename, PIPE_NAME_LENGTH, "/tmp/fa2s_");
*out_fd = open(strncat(pipename, buf, 32), O_WRONLY);
if(*out_fd < 0) {
fprintf(stderr, "[Error]: Couldn't data pipe for writing (%s)\n", pipename);
return 1;
}
free(pipename);
return 0;
}
int send_finish(int *in_fd, int *out_fd) {
if(write(*out_fd, "finish\n", 7) != 7) {
fprintf(stderr, "[Error]: Couldn't send finish to ctl\n");
close(*in_fd);
close(*out_fd);
return 1;
// TODO: How would we handle this on the server side?
}
close(*in_fd);
close(*out_fd);
return 0;
}