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#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#define SOCKET_PATH "/tmp/nix-daemon"
int main(int argc, char * * argv)
{
int res;
int sock = socket(PF_UNIX, SOCK_STREAM, 0);
assert(sock != -1);
unlink(SOCKET_PATH);
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, SOCKET_PATH);
res = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
assert(res != -1);
res = listen(sock, 5);
if (res == -1)
fprintf(stderr, "%s\n", strerror(errno));
assert(res != -1);
while (1) {
struct sockaddr_un remoteAddr;
socklen_t remoteAddrLen = sizeof(remoteAddr);
int remote = accept(sock,
(struct sockaddr *) &remoteAddr, &remoteAddrLen);
if (remote == -1)
fprintf(stderr, "%s\n", strerror(errno));
assert(remote != -1);
fprintf(stderr, "connection %d\n", remote);
while (1) {
int i;
ssize_t len;
len = recv(remote, &i, sizeof(i), 0);
if (len < sizeof(i)) break;
// printf("%d\n", i);
int j = i * 2;
len = send(remote, &j, sizeof(j), 0);
if (len == -1)
fprintf(stderr, "%s\n", strerror(errno));
assert(len == sizeof(j));
}
close(remote);
}
close(sock);
return 0;
}
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