05-28-2013
Quote:
Originally Posted by
shamrock
..only a foreground process can read from the terminal preventing multiple processes from competing for terminal input as there's only one process in the foreground at any instant...
To be more precise, any process in the foreground process group can read from the terminal, and there can be many of them in that group.
Regards,
Alister
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LEARN ABOUT HPUX
tcgetpgrp
tcgetpgrp(3C) tcgetpgrp(3C)
NAME
tcgetpgrp() - get foreground process group id
SYNOPSIS
DESCRIPTION
returns the value of the process group ID of the foreground process group associated with the terminal referenced by fildes. is allowed
from a process that is a member of a background process group (see termio(7)); however, the information can be subsequently changed by a
process that is a member of a foreground process group.
RETURN VALUE
Upon successful completion, returns the value of the process group ID of the foreground process group associated with the terminal refer-
enced by fildes. Otherwise, returns a value of -1 and sets to indicate the error.
ERRORS
fails if any of the following conditions are encountered:
The file associated with
fildes is the controlling terminal of the calling process, however, there is no foreground process group defined for
the controlling terminal.
fildes is not a valid file descriptor.
The file associated with
fildes is not the controlling terminal or the calling process does not have a controlling terminal.
WARNINGS
The error which is returned if the controlling terminal has no foreground process group, might not be returned in future releases, depend-
ing on the course taken by the POSIX standard. Portable applications therefore should not rely on this error condition.
SEE ALSO
setpgid(2), setsid(2), tcsetpgrp(3C), thread_safety(5), termio(7).
STANDARDS CONFORMANCE
tcgetpgrp(3C)