cause a process to be in background

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LEARN ABOUT SUNOS

tcgetpgrp

tcgetpgrp(3C)						   Standard C Library Functions 					     tcgetpgrp(3C)

NAME

       tcgetpgrp - get foreground process group ID

SYNOPSIS

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

       pid_t tcgetpgrp(int fildes);

DESCRIPTION

       The tcgetpgrp() function will return the value of the process group ID of the foreground process group associated with the terminal.

       If  there is no foreground process group, tcgetpgrp() returns a value greater than 1 that does not match the process group ID of any exist-
       ing process group.

       The tcgetpgrp() function is allowed from a process that is a member of a background process group; however, the information may	be  subse-
       quently changed by a process that is a member of a foreground process group.

RETURN VALUES

       Upon  successful  completion, tcgetpgrp() returns the value of the process group ID of the foreground process associated with the terminal.
       Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The tcgetpgrp() function will fail if:

       EBADF	       The fildes argument is not a valid file descriptor.

       ENOTTY	       The calling process does not have a controlling terminal, or the file is not the controlling terminal.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-------------------------------+
       |      ATTRIBUTE TYPE	     |	     ATTRIBUTE VALUE	     |
       +-----------------------------+-------------------------------+
       |Interface Stability	     |Standard			     |
       +-----------------------------+-------------------------------+
       |MT-Level		     |MT-Safe, and Async-Signal-Safe |
       +-----------------------------+-------------------------------+

SEE ALSO

       setpgid(2), setsid(2), tcsetpgrp(3C), attributes(5), standards(5), termio(7I)

SunOS 5.10							    14 Aug 2002 						     tcgetpgrp(3C)

Shell Programming and Scripting