/********************************************************************* * Socket example: Chat application, client component comm_c.c * * Compilation: gcc -o comm_c comm_c.c *********************************************************************/ #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <string.h> #define BUFSIZE 1024 char buf[BUFSIZE+1]; /* Main program: * - Process arguments. * - Open socket and establish connection to server. * - Read text line by line and send it over this connection. * - Close connection at end of entry (Ctrl-D). */ int main(int argc, char *argv[]) { int s; struct sockaddr_in addr; char *p; if (argc ! = 3) { fprintf(stderr, "Usage: %s <address> <port>\n", argv[0]); exit(1); } memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(atoi(argv[2])); addr.sin_addr.s_addr = inet_addr(argv[1]); if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) { perror("socket"); exit(1); } if (connect(s, (struct sockaddr *) &addr, sizeof(addr))) { perror("connect"); exit(1); } buf[BUFSIZE] = 0; while (fgets(buf, BUFSIZE, stdin) != NULL) { if (write(s, buf, strlen(buf)) == 0) { perror("write"); break; } } close(s); exit(0); }
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