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tcgetpgrp(3p) [posix man page]

TCGETPGRP(3P)						     POSIX Programmer's Manual						     TCGETPGRP(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       tcgetpgrp -- get the foreground process group ID

SYNOPSIS

       #include <unistd.h>

       pid_t tcgetpgrp(int fildes);

DESCRIPTION

       The tcgetpgrp() function shall 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() shall return a value greater than 1 that does not match the process group  ID  of  any
       existing 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 VALUE

       Upon successful completion, tcgetpgrp() shall return the value of the process group ID of the foreground process associated with the termi-
       nal. Otherwise, -1 shall be returned and errno set to indicate the error.

ERRORS

       The tcgetpgrp() function shall 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.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       setsid(), setpgid(), tcsetpgrp()

       The Base Definitions volume of POSIX.1-2008, <sys_types.h>, <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							     TCGETPGRP(3P)

Check Out this Related Man Page

GETPGID(3P)						     POSIX Programmer's Manual						       GETPGID(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       getpgid -- get the process group ID for a process

SYNOPSIS

       #include <unistd.h>

       pid_t getpgid(pid_t pid);

DESCRIPTION

       The getpgid() function shall return the process group ID of the process whose process ID is equal to pid.  If pid is equal to 0,  getpgid()
       shall return the process group ID of the calling process.

RETURN VALUE

       Upon  successful  completion, getpgid() shall return a process group ID. Otherwise, it shall return (pid_t)-1 and set errno to indicate the
       error.

ERRORS

       The getpgid() function shall fail if:

       EPERM  The process whose process ID is equal to pid is not in the same session as the calling process,  and  the  implementation  does  not
	      allow access to the process group ID of that process from the calling process.

       ESRCH  There is no process with a process ID equal to pid.

       The getpgid() function may fail if:

       EINVAL The value of the pid argument is invalid.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       exec, fork(), getpgrp(), getpid(), getsid(), setpgid(), setsid()

       The Base Definitions volume of POSIX.1-2008, <unistd.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							       GETPGID(3P)
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