Manpage of TCGETPGRP

TCGETPGRP

Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
Index
 

NAME

tcgetpgrp, tcsetpgrp - get and set terminal foreground process group  

SYNOPSIS

#include <unistd.h>

pid_t tcgetpgrp(int fd);

int tcsetpgrp(int fd, pid_t pgrp); 

DESCRIPTION

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 pgrpthe 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, pgrpmust 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 SIGTTOUsignal is sent to all members of this background process group.  

RETURN VALUE

When fdrefers 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 fddoes not refer to the controlling terminal of the calling process, -1 is returned, and errnois set appropriately.

When successful, tcsetpgrp() returns 0. Otherwise, it returns -1, and errnois set appropriately.  

ERRORS

EBADF
fdis not a valid file descriptor.
EINVAL
pgrphas 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
pgrphas a supported value, but is not the process group ID of a process in the same session as the calling process.
 

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
tcgetpgrp(), tcsetpgrp() Thread safetyMT-Safe
 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.  

NOTES

These functions are implemented via the TIOCGPGRPand TIOCSPGRPioctls.  

History

The ioctls appeared in 4.2BSD. The functions are POSIX inventions.  

SEE ALSO

setpgid(2), setsid(2), credentials(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
NOTES
History
SEE ALSO

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