#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

int main(void)
{
int fdm;
int rc;

// Display /dev/pts
system("ls -l /dev/pts");

fdm = posix_openpt(O_RDWR);
if (fdm < 0)
{
fprintf(stderr, "Error %d on posix_openpt()\n", errno);
return 1;
}

rc = grantpt(fdm);
if (rc != 0)
{
fprintf(stderr, "Error %d on grantpt()\n", errno);
return 1;
}

rc = unlockpt(fdm);
if (rc != 0)
{
fprintf(stderr, "Error %d on unlockpt()\n", errno);
return 1;
}

// Display the changes in /dev/pts
system("ls -l /dev/pts");

printf("The slave side is named : %s\n", ptsname(fdm));

return 0;
} // main