1PTSNAME(3P)                POSIX Programmer's Manual               PTSNAME(3P)
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PROLOG

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

12       ptsname — get name of the slave pseudo-terminal device
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SYNOPSIS

15       #include <stdlib.h>
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17       char *ptsname(int fildes);
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DESCRIPTION

20       The ptsname() function shall return the name of the slave pseudo-termi‐
21       nal  device associated with a master pseudo-terminal device. The fildes
22       argument is a file descriptor that refers to  the  master  device.  The
23       ptsname()  function  shall  return a pointer to a string containing the
24       pathname of the corresponding slave device.
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26       The ptsname() function need not be thread-safe.
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RETURN VALUE

29       Upon successful completion, ptsname()  shall  return  a  pointer  to  a
30       string  which  is  the  name  of the pseudo-terminal slave device. Upon
31       failure, ptsname() shall return a null pointer and may set errno.  This
32       could  occur  if  fildes  is an invalid file descriptor or if the slave
33       device name does not exist in the file system.
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35       The application shall not modify  the  string  returned.  The  returned
36       pointer might be invalidated or the string content might be overwritten
37       by a subsequent call to ptsname().  The returned pointer and the string
38       content might also be invalidated if the calling thread is terminated.
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ERRORS

41       The ptsname() function may fail if:
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43       EBADF  The fildes argument is not a valid file descriptor.
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45       ENOTTY The  file  associated  with  the fildes argument is not a master
46              pseudo-terminal device.
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48       The following sections are informative.
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EXAMPLES

51       None.
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APPLICATION USAGE

54       None.
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RATIONALE

57       See the RATIONALE section for posix_openpt().
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FUTURE DIRECTIONS

60       None.
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SEE ALSO

63       grantpt(), open(), posix_openpt(), ttyname(), unlockpt()
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65       The Base Definitions volume of POSIX.1‐2017, <stdlib.h>
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68       Portions of this text are reprinted and reproduced in  electronic  form
69       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
70       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
71       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
72       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
73       event of any discrepancy between this version and the original IEEE and
74       The Open Group Standard, the original IEEE and The Open Group  Standard
75       is  the  referee document. The original Standard can be obtained online
76       at http://www.opengroup.org/unix/online.html .
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78       Any typographical or formatting errors that appear  in  this  page  are
79       most likely to have been introduced during the conversion of the source
80       files to man page format. To report such errors,  see  https://www.ker‐
81       nel.org/doc/man-pages/reporting_bugs.html .
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85IEEE/The Open Group                  2017                          PTSNAME(3P)
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