5 #include <sys/socket.h>
10 static void logmsg(FILE *stream, char *fmt, va_list ap) {
11 vfprintf(stream, fmt, ap);
14 static void warn(char *warnfmt, ...) {
16 va_start(ap, warnfmt);
17 logmsg(stderr, warnfmt, ap);
21 __attribute__((noreturn))
22 static void err(char *errfmt, ...) {
25 logmsg(stderr, errfmt, ap);
30 int main(int argc, char *argv[])
33 struct sockaddr_un sock_address;
34 char msg[BUFSIZ] = {0};
35 char rsp[BUFSIZ] = {0};
38 err("invalid number of arguments: %d\n", argc);
40 char *sock_path = getenv(SOCKET_ENV_VAR);
41 if (sock_path == NULL || strlen(sock_path) == 0)
42 warn("environmental variable '%s' is not set or empty - using default value: %s\n", SOCKET_ENV_VAR, DEFAULT_SOCKET_PATH);
43 else if (sizeof(sock_address.sun_path) <= strlen(sock_path))
44 err("value too long for environmental variable '%s'\n", SOCKET_ENV_VAR);
46 sock_address.sun_family = AF_UNIX;
47 strncpy(sock_address.sun_path, (sock_path == NULL ? DEFAULT_SOCKET_PATH: sock_path), sizeof(sock_address.sun_path));
48 sock_address.sun_path[sizeof(sock_address.sun_path) - 1] = 0;
50 for (int offset = 0, len = BUFSIZ, n = 0; --argc && ++argv && len > 0; offset += n, len -= offset)
51 n = snprintf(msg + offset, len, "%s ", *argv);
53 sock_fd = socket(AF_UNIX, SOCK_STREAM, 0);
55 err("failed to create socket\n");
57 if (connect(sock_fd, (struct sockaddr *) &sock_address, sizeof(sock_address)) == -1)
58 err("failed to connect to socket\n");
60 if (send(sock_fd, msg, strlen(msg), 0) == -1)
61 err("failed to send data\n");
63 int n = recv(sock_fd, rsp, sizeof(rsp), 0);
65 err("failed to get response\n");