diff options
Diffstat (limited to 'man3/getaddrinfo.3')
| -rw-r--r-- | man3/getaddrinfo.3 | 70 |
1 files changed, 35 insertions, 35 deletions
diff --git a/man3/getaddrinfo.3 b/man3/getaddrinfo.3 index 5af0709fc..8c4de3b16 100644 --- a/man3/getaddrinfo.3 +++ b/man3/getaddrinfo.3 @@ -656,9 +656,9 @@ The programs are an echo server and client for UDP datagrams. #include <sys/socket.h> #include <sys/types.h> #include <unistd.h> - +\& #define BUF_SIZE 500 - +\& int main(int argc, char *argv[]) { @@ -669,12 +669,12 @@ main(int argc, char *argv[]) struct addrinfo hints; struct addrinfo *result, *rp; struct sockaddr_storage peer_addr; - +\& if (argc != 2) { fprintf(stderr, "Usage: %s port\en", argv[0]); exit(EXIT_FAILURE); } - +\& memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */ hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */ @@ -683,48 +683,48 @@ main(int argc, char *argv[]) hints.ai_canonname = NULL; hints.ai_addr = NULL; hints.ai_next = NULL; - +\& s = getaddrinfo(NULL, argv[1], &hints, &result); if (s != 0) { fprintf(stderr, "getaddrinfo: %s\en", gai_strerror(s)); exit(EXIT_FAILURE); } - +\& /* getaddrinfo() returns a list of address structures. Try each address until we successfully bind(2). If socket(2) (or bind(2)) fails, we (close the socket and) try the next address. */ - +\& for (rp = result; rp != NULL; rp = rp\->ai_next) { sfd = socket(rp\->ai_family, rp\->ai_socktype, rp\->ai_protocol); if (sfd == \-1) continue; - +\& if (bind(sfd, rp\->ai_addr, rp\->ai_addrlen) == 0) break; /* Success */ - +\& close(sfd); } - +\& freeaddrinfo(result); /* No longer needed */ - +\& if (rp == NULL) { /* No address succeeded */ fprintf(stderr, "Could not bind\en"); exit(EXIT_FAILURE); } - +\& /* Read datagrams and echo them back to sender. */ - +\& for (;;) { char host[NI_MAXHOST], service[NI_MAXSERV]; - +\& peer_addrlen = sizeof(peer_addr); nread = recvfrom(sfd, buf, BUF_SIZE, 0, (struct sockaddr *) &peer_addr, &peer_addrlen); if (nread == \-1) continue; /* Ignore failed request */ - +\& s = getnameinfo((struct sockaddr *) &peer_addr, peer_addrlen, host, NI_MAXHOST, service, NI_MAXSERV, NI_NUMERICSERV); @@ -733,7 +733,7 @@ main(int argc, char *argv[]) nread, host, service); else fprintf(stderr, "getnameinfo: %s\en", gai_strerror(s)); - +\& if (sendto(sfd, buf, nread, 0, (struct sockaddr *) &peer_addr, peer_addrlen) != nread) { @@ -754,9 +754,9 @@ main(int argc, char *argv[]) #include <sys/socket.h> #include <sys/types.h> #include <unistd.h> - +\& #define BUF_SIZE 500 - +\& int main(int argc, char *argv[]) { @@ -766,77 +766,77 @@ main(int argc, char *argv[]) ssize_t nread; struct addrinfo hints; struct addrinfo *result, *rp; - +\& if (argc < 3) { fprintf(stderr, "Usage: %s host port msg...\en", argv[0]); exit(EXIT_FAILURE); } - +\& /* Obtain address(es) matching host/port. */ - +\& memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */ hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */ hints.ai_flags = 0; hints.ai_protocol = 0; /* Any protocol */ - +\& s = getaddrinfo(argv[1], argv[2], &hints, &result); if (s != 0) { fprintf(stderr, "getaddrinfo: %s\en", gai_strerror(s)); exit(EXIT_FAILURE); } - +\& /* getaddrinfo() returns a list of address structures. Try each address until we successfully connect(2). If socket(2) (or connect(2)) fails, we (close the socket and) try the next address. */ - +\& for (rp = result; rp != NULL; rp = rp\->ai_next) { sfd = socket(rp\->ai_family, rp\->ai_socktype, rp\->ai_protocol); if (sfd == \-1) continue; - +\& if (connect(sfd, rp\->ai_addr, rp\->ai_addrlen) != \-1) break; /* Success */ - +\& close(sfd); } - +\& freeaddrinfo(result); /* No longer needed */ - +\& if (rp == NULL) { /* No address succeeded */ fprintf(stderr, "Could not connect\en"); exit(EXIT_FAILURE); } - +\& /* Send remaining command\-line arguments as separate datagrams, and read responses from server. */ - +\& for (size_t j = 3; j < argc; j++) { len = strlen(argv[j]) + 1; /* +1 for terminating null byte */ - +\& if (len > BUF_SIZE) { fprintf(stderr, "Ignoring long message in argument %zu\en", j); continue; } - +\& if (write(sfd, argv[j], len) != len) { fprintf(stderr, "partial/failed write\en"); exit(EXIT_FAILURE); } - +\& nread = read(sfd, buf, BUF_SIZE); if (nread == \-1) { perror("read"); exit(EXIT_FAILURE); } - +\& printf("Received %zd bytes: %s\en", nread, buf); } - +\& exit(EXIT_SUCCESS); } .EE |