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POSIX_OPENPT(3)          BSD Library Functions Manual          POSIX_OPENPT(3)

NAME
     posix_openpt -- open a pseudo-terminal device

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdlib.h>
     #include <fcntl.h>

     int
     posix_openpt(int oflag);

DESCRIPTION
     The posix_openpt() function searches for an unused master pseudo-terminal
     device, opens it, and returns a file descriptor associated with the now
     used pseudo-terminal device.  The oflag argument has the same meaning as
     in the open(2) call.

RETURN VALUES
     If successful, posix_openpt() returns a non-negative integer, which
     corresponds to a file descriptor pointing to the master pseudo-terminal
     device.  Otherwise, a value of -1 is returned and errno is set to
     indicate the error.

SEE ALSO
     ioctl(2), open(2), grantpt(3), ptsname(3), unlockpt(3)

RATIONALE
     The standards committee did not want to directly expose the cloning
     device, thus decided to wrap the functionality in this function.  The
     equivalent code would be:

             int
             posix_openpt(int oflag) {
                     return open("/dev/ptmx", oflag);
             }

STANDARDS
     The posix_openpt() function conforms to IEEE Std 1003.1-2001 ("POSIX.1").

BSD                              May 25, 2004                              BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | RATIONALE | STANDARDS