International Approval for Single UNIX Spec


 
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Old 11-17-2002
International Approval for Single UNIX Spec

The joint revision to POSIX and the Single UNIX Specification have received international approval by the ISO/IEC and have become International Standard ISO/IEC 9945:2002.

See http://www.unix.org/version3/ for information on the specification, including how to read and/or download a free copy of the standard

See the ISO announcement at:
http://www.iso.ch/iso/en/commcentre/...02/Ref837.html
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GETPGRP(2)						      BSD System Calls Manual							GETPGRP(2)

NAME
getpgrp -- get process group LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> pid_t getpgrp(void); pid_t getpgid(pid_t pid); DESCRIPTION
The process group of the current process is returned by getpgrp(). The process group of the process identified by pid is returned by getpgid(). If pid is zero, getpgid() returns the process group of the current process. Process groups are used for distribution of signals, and by terminals to arbitrate requests for their input: processes that have the same process group as the terminal are foreground and may read, while others will block with a signal if they attempt to read. This system call is thus used by programs such as csh(1) to create process groups in implementing job control. The tcgetpgrp() and tcsetpgrp() calls are used to get/set the process group of the control terminal. RETURN VALUES
The getpgrp() system call always succeeds. Upon successful completion, the getpgid() system call returns the process group of the specified process; otherwise, it returns a value of -1 and sets errno to indicate the error. COMPATIBILITY
This version of getpgrp() differs from past Berkeley versions by not taking a pid_t pid argument. This incompatibility is required by ISO/IEC 9945-1:1990 (``POSIX.1''). From the ISO/IEC 9945-1:1990 (``POSIX.1'') Rationale: 4.3BSD provides a getpgrp() system call that returns the process group ID for a specified process. Although this function is used to support job control, all known job-control shells always specify the calling process with this function. Thus, the simpler AT&T System V UNIX getpgrp() suffices, and the added complexity of the 4.3BSD getpgrp() has been omitted from POSIX.1. The old functionality is available from the getpgid() system call. ERRORS
The getpgid() system call will succeed unless: [ESRCH] there is no process whose process ID equals pid SEE ALSO
getsid(2), setpgid(2), termios(4) STANDARDS
The getpgrp() system call is expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
The getpgrp() system call appeared in 4.0BSD. The getpgid() system call is derived from its usage in AT&T System V Release 4 UNIX. BSD
June 4, 1993 BSD