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 to indicate the error.
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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  at‐
35       tributes(7).
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37       ┌────────────────────────────────────────────┬───────────────┬─────────┐
38       │Interface                                   │ Attribute     │ Value   │
39       ├────────────────────────────────────────────┼───────────────┼─────────┤
40       │tcgetsid()                                  │ Thread safety │ MT-Safe │
41       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

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

47       This  function  is implemented via the TIOCGSID ioctl(2), present since
48       Linux 2.1.71.
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SEE ALSO

51       getsid(2)
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COLOPHON

54       This page is part of release 5.13 of the Linux  man-pages  project.   A
55       description  of  the project, information about reporting bugs, and the
56       latest    version    of    this    page,    can     be     found     at
57       https://www.kernel.org/doc/man-pages/.
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61GNU                               2021-03-22                       TCGETSID(3)
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