diff options
Diffstat (limited to 'talker.c')
| -rw-r--r-- | talker.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/talker.c b/talker.c new file mode 100644 index 0000000..bb801e5 --- /dev/null +++ b/talker.c @@ -0,0 +1,67 @@ +/* +** talker.c -- a datagram "client" demo +*/ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> + +#define SERVERPORT "4950" // the port users will be connecting to + +int main(int argc, char *argv[]) +{ + int sockfd; + struct addrinfo hints, *servinfo, *p; + int rv; + int numbytes; + + if (argc != 3) { + fprintf(stderr,"usage: talker hostname message\n"); + exit(1); + } + + memset(&hints, 0, sizeof hints); + hints.ai_family = AF_INET6; // set to AF_INET to use IPv4 + hints.ai_socktype = SOCK_DGRAM; + + if ((rv = getaddrinfo(argv[1], SERVERPORT, &hints, &servinfo)) != 0) { + fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv)); + return 1; + } + + // loop through all the results and make a socket + for(p = servinfo; p != NULL; p = p->ai_next) { + if ((sockfd = socket(p->ai_family, p->ai_socktype, + p->ai_protocol)) == -1) { + perror("talker: socket"); + continue; + } + + break; + } + + if (p == NULL) { + fprintf(stderr, "talker: failed to create socket\n"); + return 2; + } + + if ((numbytes = sendto(sockfd, argv[2], strlen(argv[2]), 0, + p->ai_addr, p->ai_addrlen)) == -1) { + perror("talker: sendto"); + exit(1); + } + + freeaddrinfo(servinfo); + + printf("talker: sent %d bytes to %s\n", numbytes, argv[1]); + close(sockfd); + + return 0; +}
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