1384 Chapter 64
Listing 64-1: Implementation of ptyMasterOpen()
–––––––––––––––––––––––––––––––––––––––––––––––––––––pty/pty_master_open.c
#define _XOPEN_SOURCE 600
#include <stdlib.h>
#include <fcntl.h>
#include "pty_master_open.h" /* Declares ptyMasterOpen() */
#include "tlpi_hdr.h"int
ptyMasterOpen(char *slaveName, size_t snLen)
{
int masterFd, savedErrno;
char *p;masterFd = posix_openpt(O_RDWR | O_NOCTTY); /* Open pty master */
if (masterFd == -1)
return -1;if (grantpt(masterFd) == -1) { /* Grant access to slave pty */
savedErrno = errno;
close(masterFd); /* Might change 'errno' */
errno = savedErrno;
return -1;
}if (unlockpt(masterFd) == -1) { /* Unlock slave pty */
savedErrno = errno;
close(masterFd); /* Might change 'errno' */
errno = savedErrno;
return -1;
}p = ptsname(masterFd); /* Get slave pty name */
if (p == NULL) {
savedErrno = errno;
close(masterFd); /* Might change 'errno' */
errno = savedErrno;
return -1;
}if (strlen(p) < snLen) {
strncpy(slaveName, p, snLen);
} else { /* Return an error if buffer too small */
close(masterFd);
errno = EOVERFLOW;
return -1;
}return masterFd;
}
–––––––––––––––––––––––––––––––––––––––––––––––––––––pty/pty_master_open.c