1GRANTPT(3P)                POSIX Programmer's Manual               GRANTPT(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       grantpt — grant access to the slave pseudo-terminal device
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SYNOPSIS

15       #include <stdlib.h>
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17       int grantpt(int fildes);
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DESCRIPTION

20       The grantpt() function shall change the mode and ownership of the slave
21       pseudo-terminal device associated with its master pseudo-terminal coun‐
22       terpart. The fildes argument is a file descriptor that refers to a mas‐
23       ter  pseudo-terminal  device.  The user ID of the slave shall be set to
24       the real UID of the calling process and the group ID shall be set to an
25       unspecified  group ID. The permission mode of the slave pseudo-terminal
26       shall be set to readable and writable by the owner, and writable by the
27       group.
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29       The  behavior  of the grantpt() function is unspecified if the applica‐
30       tion has installed a signal handler to catch SIGCHLD signals.
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RETURN VALUE

33       Upon successful completion, grantpt() shall  return  0;  otherwise,  it
34       shall return -1 and set errno to indicate the error.
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ERRORS

37       The grantpt() function may fail if:
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39       EACCES The  corresponding  slave  pseudo-terminal  device  could not be
40              accessed.
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42       EBADF  The fildes argument is not a valid open file descriptor.
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44       EINVAL The fildes argument is not associated with a master  pseudo-ter‐
45              minal device.
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47       The following sections are informative.
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EXAMPLES

50       None.
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APPLICATION USAGE

53       None.
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RATIONALE

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

59       None.
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SEE ALSO

62       open(), posix_openpt(), ptsname(), unlockpt()
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64       The Base Definitions volume of POSIX.1‐2017, <stdlib.h>
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67       Portions  of  this text are reprinted and reproduced in electronic form
68       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
69       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
70       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
71       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
72       event of any discrepancy between this version and the original IEEE and
73       The  Open Group Standard, the original IEEE and The Open Group Standard
74       is the referee document. The original Standard can be  obtained  online
75       at http://www.opengroup.org/unix/online.html .
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77       Any  typographical  or  formatting  errors that appear in this page are
78       most likely to have been introduced during the conversion of the source
79       files  to  man page format. To report such errors, see https://www.ker‐
80       nel.org/doc/man-pages/reporting_bugs.html .
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84IEEE/The Open Group                  2017                          GRANTPT(3P)
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