1GRANTPT(3P)                POSIX Programmer's Manual               GRANTPT(3P)
2
3
4

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.
10
11

NAME

13       grantpt — grant access to the slave pseudo-terminal device
14

SYNOPSIS

16       #include <stdlib.h>
17
18       int grantpt(int fildes);
19

DESCRIPTION

21       The grantpt() function shall change the mode and ownership of the slave
22       pseudo-terminal device associated with its master pseudo-terminal coun‐
23       terpart. The fildes argument is a file descriptor that refers to a mas‐
24       ter  pseudo-terminal  device.  The user ID of the slave shall be set to
25       the real UID of the calling process and the group ID shall be set to an
26       unspecified  group ID. The permission mode of the slave pseudo-terminal
27       shall be set to readable and writable by the owner, and writable by the
28       group.
29
30       The  behavior  of the grantpt() function is unspecified if the applica‐
31       tion has installed a signal handler to catch SIGCHLD signals.
32

RETURN VALUE

34       Upon successful completion, grantpt() shall  return  0;  otherwise,  it
35       shall return −1 and set errno to indicate the error.
36

ERRORS

38       The grantpt() function may fail if:
39
40       EBADF  The fildes argument is not a valid open file descriptor.
41
42       EINVAL The  fildes argument is not associated with a master pseudo-ter‐
43              minal device.
44
45       EACCES The corresponding slave  pseudo-terminal  device  could  not  be
46              accessed.
47
48       The following sections are informative.
49

EXAMPLES

51       None.
52

APPLICATION USAGE

54       None.
55

RATIONALE

57       See the RATIONALE section for posix_openpt().
58

FUTURE DIRECTIONS

60       None.
61

SEE ALSO

63       open(), posix_openpt(), ptsname(), unlockpt()
64
65       The Base Definitions volume of POSIX.1‐2008, <stdlib.h>
66

68       Portions  of  this text are reprinted and reproduced in electronic form
69       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
70       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
71       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
72       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
73       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
74       event of any discrepancy between this version and the original IEEE and
75       The Open Group Standard, the original IEEE and The Open Group  Standard
76       is  the  referee document. The original Standard can be obtained online
77       at http://www.unix.org/online.html .
78
79       Any typographical or formatting errors that appear  in  this  page  are
80       most likely to have been introduced during the conversion of the source
81       files to man page format. To report such errors,  see  https://www.ker‐
82       nel.org/doc/man-pages/reporting_bugs.html .
83
84
85
86IEEE/The Open Group                  2013                          GRANTPT(3P)
Impressum