ptsname(3p) — Linux manual page

PTSNAME(3P)             POSIX Programmer's Manual            PTSNAME(3P)

PROLOG

       This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

NAME

       ptsname — get name of the slave pseudo-terminal device

SYNOPSIS

       #include <stdlib.h>

       char *ptsname(int fildes);

DESCRIPTION

       The ptsname() function shall return the name of the slave pseudo-
       terminal device associated with a master pseudo-terminal device.
       The fildes argument is a file descriptor that refers to the
       master device. The ptsname() function shall return a pointer to a
       string containing the pathname of the corresponding slave device.

       The ptsname() function need not be thread-safe.

RETURN VALUE

       Upon successful completion, ptsname() shall return a pointer to a
       string which is the name of the pseudo-terminal slave device.
       Upon failure, ptsname() shall return a null pointer and may set
       errno.  This could occur if fildes is an invalid file descriptor
       or if the slave device name does not exist in the file system.

       The application shall not modify the string returned. The
       returned pointer might be invalidated or the string content might
       be overwritten by a subsequent call to ptsname().  The returned
       pointer and the string content might also be invalidated if the
       calling thread is terminated.

ERRORS

       The ptsname() function may fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       ENOTTY The file associated with the fildes argument is not a
              master pseudo-terminal device.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       See the RATIONALE section for posix_openpt(3p).

FUTURE DIRECTIONS

       None.

SEE ALSO

       grantpt(3p), open(3p), posix_openpt(3p), ttyname(3p),
       unlockpt(3p)

       The Base Definitions volume of POSIX.1‐2017, stdlib.h(0p)

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 by the Institute of Electrical and Electronics
       Engineers, Inc and The Open Group.  In the event of any
       discrepancy between this version and the original IEEE and The
       Open Group Standard, the original IEEE and The Open Group
       Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page
       are most likely to have been introduced during the conversion of
       the source files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group               2017                       PTSNAME(3P)

Pages that refer to this page: stdlib.h(0p), grantpt(3p), posix_openpt(3p), unlockpt(3p)

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