diff options
Diffstat (limited to '03_exercise/echo_server/server.c')
-rw-r--r-- | 03_exercise/echo_server/server.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/03_exercise/echo_server/server.c b/03_exercise/echo_server/server.c new file mode 100644 index 0000000..faf309c --- /dev/null +++ b/03_exercise/echo_server/server.c @@ -0,0 +1,56 @@ + +#include <stdio.h> +#include <stdlib.h> + +#include <unistd.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +static inline void die(const char* msg) +{ + perror(msg); + exit(-1); +} + +int main() +{ + struct sockaddr_in srv_addr, cli_addr; + int sockopt = 1; + socklen_t sad_sz = sizeof(struct sockaddr_in); + int sfd, cfd; + ssize_t bytes; + char buf[256]; + + srv_addr.sin_family = AF_INET; + srv_addr.sin_port = htons(8000); + srv_addr.sin_addr.s_addr = INADDR_ANY; + + if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) + die("Couldn't open the socket"); + + setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (char*) &sockopt, sizeof(sockopt)); + + if (bind(sfd, (struct sockaddr*) &srv_addr, sad_sz) < 0) + die("Couldn't bind socket"); + + if (listen(sfd, 1) < 0) + die("Couldn't listen to the socket"); + + cfd = accept(sfd, (struct sockaddr*) &cli_addr, &sad_sz); + if (cfd < 0) + die("Couldn't accept incoming connection"); + + while ((bytes = read(cfd, buf, sizeof(buf))) != 0) + { + if (bytes < 0) + die("Couldn't receive message"); + + if (write(cfd, buf, bytes) < 0) + die("Couldn't send message"); + } + + close(cfd); + close(sfd); + return 0; +} |