tcsetpgrp - Set foreground process group ID
pid_t pgrp_id );
Application developers may want to specify an #include
statement for <sys/types.h> before the one for <unistd.h>
if programs are being developed for multiple platforms.
The additional #include statement is not required on Tru64
UNIX systems or by ISO or X/Open standards, but may be
required on other vendors' systems that conform to these
Standard C Library (libc)
Specifies an open file descriptor. Specifies the process
If the process has a controlling terminal, the tcsetpgrp()
function sets the foreground process group ID associated
with the terminal to the value of the pgrp_id parameter.
The file associated with the filedes parameter must be the
controlling terminal of the calling process, and the controlling
terminal must be currently associated with the
session of the calling process. The value of the pgrp_id
parameter must match a process group ID of a process in
the same session as the calling process.
Upon successful completion, a value of 0 (zero) is
returned. Otherwise, a value of -1 is returned and errno
is set to indicate the error.
The tcsetpgrp() function sets errno to the specified values
for the following conditions:
The filedes parameter is not a valid file descriptor. The
pgrp_id parameter is invalid. The calling process does
not have a controlling terminal, the file is not the controlling
terminal, or the controlling terminal is no
longer associated with the session of the calling process.
The value of the pgrp_id parameter does not match the process
group ID of a process in the same session as the
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