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#if 0
exec cc -Wall -Wextra -pedantic $@ -o $(dirname $0)/pbd $0
#endif
// TCP server which pipes between macOS pbcopy and pbpaste.
#include <err.h>
#include <netinet/in.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sysexits.h>
#include <unistd.h>
static void spawn(const char *cmd, int childFd, int parentFd) {
pid_t pid = fork();
if (pid < 0) err(EX_OSERR, "fork");
if (pid) {
int status;
pid_t wait = waitpid(pid, &status, 0);
if (wait < 0) err(EX_OSERR, "waitpid");
if (status) {
warnx("child %s status %d", cmd, status);
}
} else {
int fd = dup2(parentFd, childFd);
if (fd < 0) err(EX_OSERR, "dup2");
int error = execlp(cmd, cmd);
if (error) err(EX_OSERR, "execlp");
}
}
int main() {
int error;
int server = socket(PF_INET, SOCK_STREAM, 0);
if (server < 0) err(EX_OSERR, "socket");
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = htons(7062),
.sin_addr = { .s_addr = htonl(0x7f000001) },
};
error = bind(server, (struct sockaddr *)&addr, sizeof(addr));
if (error) err(EX_OSERR, "bind");
error = listen(server, 1);
if (error) err(EX_OSERR, "listen");
for (;;) {
int client = accept(server, NULL, NULL);
if (client < 0) err(EX_OSERR, "accept");
spawn("pbpaste", STDOUT_FILENO, client);
uint8_t p;
ssize_t peek = recv(client, &p, 1, MSG_PEEK);
if (peek < 0) err(EX_IOERR, "recv");
if (peek) {
spawn("pbcopy", STDIN_FILENO, client);
}
error = close(client);
if (error) err(EX_IOERR, "close");
}
}
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