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#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#define MAX_CLIENTS 1
#ifdef DEBUG
#define DEBUGPRINT(fmt, ...) fprintf(stderr, "DEBUG: %s %s %d: " fmt, \
__FILE__, __func__, __LINE__, __VA_ARGS__)
#else
#define DEBUGPRINT(...) (void)0
#endif
int main(int argc, char *argv[]){
struct sockaddr_un sock = {
.sun_family = AF_UNIX
};
int sfd;
if (argc < 1){
fprintf(stderr, "Usage: %s PATH\n", argv[0]);
return 1;
}
strncpy(sock.sun_path, argv[1], sizeof(sock) - offsetof(struct sockaddr_un, sun_path));
DEBUGPRINT("%s", "Constructed socket address\n");
if ((sfd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1){
perror("socket");
return 2;
}
DEBUGPRINT("Created socket fd=%d\n", sfd);
if (bind(sfd, (struct sockaddr*)&sock, sizeof(sock)) == -1){
perror("bind");
return 3;
}
if (listen(sfd, MAX_CLIENTS) == -1){
perror("listen");
return 4;
}
DEBUGPRINT("Listening to %d clients\n", MAX_CLIENTS);
{
struct sockaddr_un client_address;
socklen_t client_size = sizeof(client_address);
int cfd;
while ((cfd = accept(sfd, (struct sockaddr*)&client_address,
&client_size)) != -1) {
char buf[BUFSIZ];
ssize_t rdcount = -1;
DEBUGPRINT("Listening to client fd=%d\n", cfd);
while ((rdcount = read(cfd, buf, sizeof(buf))) > 0) {
DEBUGPRINT("Read %zi bytes from client, "
"message was:\n%.*s", rdcount,
rdcount, buf);
write(STDOUT_FILENO, buf, rdcount);
}
assert(rdcount == 0 || rdcount == -1);
if (rdcount == -1) {
perror("read");
return 5;
}
DEBUGPRINT("Finished listening to fd=%d\n", cfd);
close(cfd);
}
}
close(sfd);
unlink(argv[1]);
return 0;
}
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