man openpty
Cheers, -kls
mara ailiez sy wrote:
Hello...
I am currently developing my undergrad thesis and is developing a remote login with the username and password supplied. I have created the code below. However, I keep getting an error about "Pseudo termnial cannot be allocated because the stdin is not a terminal". Then a permission denied ... I was wondering if the use of pipe as the communication between the processes can be done?
#include <stdio.h> #include <sys/types.h> #include <unistd.h> #include <string.h> #include <errno.h>
#define BUFFERSIZE 256
int main() {
int n; char buffer[BUFFERSIZE];
int fds_ci[2]; // file descriptors - child input
int fds_co[2]; // file descriptors - child output
// create the I/O pipes if (0 != pipe(fds_ci) || 0 != pipe(fds_co)) return 1;
// create the child process if (fork() == 0) {
// in the child process
dup2(fds_ci[1], 0);
dup2(fds_co[0], 1);
close(fds_ci[0]); close(fds_ci[1]); close(fds_co[0]); close(fds_co[1]);
execl("/usr/bin/ssh", "ssh", "root@localhost", NULL); return 2;
}
// in parent process
close(fds_ci[1]); close(fds_co[0]); write(fd_ci[1], "password", BUFFERSIZE);
// read child's output and redirect it to standard output while (0 < (n = read(fds_co[0], buffer, BUFFERSIZE))) { // write to the parent's stdout write(stdout, buffer, n); }
// close the remaining pipes close(fds_ci[0]); close(fds_co[1]);
return 0; }
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Look ma, no threads[1]. [1] BitTorrent in C is http://www.sf.net/projects/libbt
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