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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTSNAME(3P) POSIX Programmer's Manual PTSNAME(3P)
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.
ptsname — get name of the slave pseudo-terminal device
#include <stdlib.h>
char *ptsname(int fildes);
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.
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.
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.
None.
None.
See the RATIONALE section for posix_openpt(3p).
None.
grantpt(3p), open(3p), posix_openpt(3p), ttyname(3p), unlockpt(3p)
The Base Definitions volume of POSIX.1‐2017, stdlib.h(0p)
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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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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