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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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tcgetpgrp(3) Library Functions Manual tcgetpgrp(3)
tcgetpgrp, tcsetpgrp - get and set terminal foreground process
group
Standard C library (libc, -lc)
#include <unistd.h>
pid_t tcgetpgrp(int fd);
int tcsetpgrp(int fd, pid_t pgrp);
The function tcgetpgrp() returns the process group ID of the
foreground process group on the terminal associated to fd, which
must be the controlling terminal of the calling process.
The function tcsetpgrp() makes the process group with process
group ID pgrp the foreground process group on the terminal
associated to fd, which must be the controlling terminal of the
calling process, and still be associated with its session.
Moreover, pgrp must be a (nonempty) process group belonging to
the same session as the calling process.
If tcsetpgrp() is called by a member of a background process
group in its session, and the calling process is not blocking or
ignoring SIGTTOU, a SIGTTOU signal is sent to all members of this
background process group.
When fd refers to the controlling terminal of the calling
process, the function tcgetpgrp() will return the foreground
process group ID of that terminal if there is one, and some value
larger than 1 that is not presently a process group ID otherwise.
When fd does not refer to the controlling terminal of the calling
process, -1 is returned, and errno is set to indicate the error.
When successful, tcsetpgrp() returns 0. Otherwise, it returns
-1, and errno is set to indicate the error.
EBADF fd is not a valid file descriptor.
EINVAL pgrp has an unsupported value.
ENOTTY The calling process does not have a controlling terminal,
or it has one but it is not described by fd, or, for
tcsetpgrp(), this controlling terminal is no longer
associated with the session of the calling process.
EPERM pgrp has a supported value, but is not the process group
ID of a process in the same session as the calling
process.
For an explanation of the terms used in this section, see
attributes(7).
┌─────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├─────────────────────────────────────┼───────────────┼─────────┤
│ tcgetpgrp(), tcsetpgrp() │ Thread safety │ MT-Safe │
└─────────────────────────────────────┴───────────────┴─────────┘
These functions are implemented via the TIOCGPGRP and TIOCSPGRP
ioctls.
POSIX.1-2008.
POSIX.1-2001.
The ioctls appeared in 4.2BSD. The functions are POSIX
inventions.
setpgid(2), setsid(2), credentials(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 tcgetpgrp(3)
Pages that refer to this page: setpgid(2), TIOCSPGRP(2const), credentials(7), signal-safety(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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