tcgetsid(3)

1TCGETSID(3)                Linux Programmer's Manual               TCGETSID(3)
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NAME

6       tcgetsid - get session ID
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SYNOPSIS

9       #define _XOPEN_SOURCE 500        /* See feature_test_macros(7) */
10       #include <termios.h>
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12       pid_t tcgetsid(int fd);
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DESCRIPTION

15       The  function  tcgetsid() returns the session ID of the current session
16       that has the terminal associated to fd as controlling  terminal.   This
17       terminal must be the controlling terminal of the calling process.
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RETURN VALUE

20       When fd refers to the controlling terminal of our session, the function
21       tcgetsid() will return the session ID of this session.   Otherwise,  -1
22       is returned, and errno is set appropriately.
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ERRORS

25       EBADF  fd is not a valid file descriptor.
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27       ENOTTY The  calling process does not have a controlling terminal, or it
28              has one but it is not described by fd.
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VERSIONS

31       tcgetsid() is provided in glibc since version 2.1.
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ATTRIBUTES

34       For  an  explanation  of  the  terms  used   in   this   section,   see
35       attributes(7).
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37       ┌───────────┬───────────────┬─────────┐
38       │Interface  │ Attribute     │ Value   │
39       ├───────────┼───────────────┼─────────┤
40       │tcgetsid() │ Thread safety │ MT-Safe │
41       └───────────┴───────────────┴─────────┘

CONFORMING TO

43       POSIX.1-2001, POSIX.1-2008.
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NOTES

46       This  function  is implemented via the TIOCGSID ioctl(2), present since
47       Linux 2.1.71.
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COLOPHON

53       This page is part of release 4.15 of the Linux  man-pages  project.   A
54       description  of  the project, information about reporting bugs, and the
55       latest    version    of    this    page,    can     be     found     at
56       https://www.kernel.org/doc/man-pages/.
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60GNU                               2015-08-08                       TCGETSID(3)