tcsetpgrp man page on FreeBSD

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TCSETPGRP(3)		 BSD Library Functions Manual		  TCSETPGRP(3)

NAME
     tcsetpgrp — set foreground process group ID

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <unistd.h>

     int
     tcsetpgrp(int fd, pid_t pgrp_id);

DESCRIPTION
     If the process has a controlling terminal, the tcsetpgrp() function sets
     the foreground process group ID associated with the terminal device to
     pgrp_id.  The terminal device associated with fd must be the controlling
     terminal of the calling process and the controlling terminal must be cur‐
     rently associated with the session of the calling process.	 The value of
     pgrp_id must be the same as the process group ID of a process in the same
     session as the calling process.

RETURN VALUES
     The tcsetpgrp() function returns the value 0 if successful; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     The tcsetpgrp() function will fail if:

     [EBADF]		The fd argument is not a valid file descriptor.

     [EINVAL]		An invalid value of pgrp_id was specified.

     [ENOTTY]		The calling process does not have a controlling termi‐
			nal, or the file represented by fd is not the control‐
			ling terminal, or the controlling terminal is no
			longer associated with the session of the calling
			process.

     [EPERM]		The pgrp_id argument does not match the process group
			ID of a process in the same session as the calling
			process.

SEE ALSO
     setpgid(2), setsid(2), tcgetpgrp(3)

STANDARDS
     The tcsetpgrp() function is expected to be compliant with the IEEE Std
     1003.1-1988 (“POSIX.1”) specification.

BSD				 June 4, 1993				   BSD
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