Linux 2.6 - man page for tcgetsid (linux section 3)
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TCGETSID(3) Linux Programmer's Manual TCGETSID(3)
tcgetsid - get session ID
#define _XOPEN_SOURCE 500 /* See feature_test_macros(7) */
pid_t tcgetsid(int fd);
The function tcgetsid() returns the session ID of the current session that has the termi-
nal associated to fd as controlling terminal. This terminal must be the controlling ter-
minal of the calling process.
When fd refers to the controlling terminal of our session, the function tcgetsid() will
return the session ID of this session. Otherwise, -1 is returned, and errno is set appro-
EBADF fd is not a valid file descriptor.
ENOTTY The calling process does not have a controlling terminal, or it has one but it is
not described by fd.
tcgetsid() is provided in glibc since version 2.1.
This function is implemented via the TIOCGSID ioctl(2), present since Linux 2.1.71.
This page is part of release 3.55 of the Linux man-pages project. A description of the
project, and information about reporting bugs, can be found at
GNU 2010-09-10 TCGETSID(3)
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