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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "GETGRGID" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" getgrgid 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+getgrgid, getgrgid_r \- get group database entry for a group ID
+.SH SYNOPSIS
+.LP
+\fB#include <grp.h>
+.br
+.sp
+struct group *getgrgid(gid_t\fP \fIgid\fP\fB);
+.br
+\fP
+.LP
+\fBint getgrgid_r(gid_t\fP \fIgid\fP\fB, struct group *\fP\fIgrp\fP\fB,
+char
+*\fP\fIbuffer\fP\fB,
+.br
+\ \ \ \ \ \  size_t\fP \fIbufsize\fP\fB, struct group **\fP\fIresult\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIgetgrgid\fP() function shall search the group database for
+an entry with a matching \fIgid\fP.
+.LP
+The \fIgetgrgid\fP() function need not be reentrant. A function that
+is not required to be reentrant is not required to be
+thread-safe.
+.LP
+The \fIgetgrgid_r\fP() function shall update the \fBgroup\fP structure
+pointed to by \fIgrp\fP and store a pointer to that
+structure at the location pointed to by \fIresult\fP. The structure
+shall contain an entry from the group database with a matching
+\fIgid\fP. Storage referenced by the group structure is allocated
+from the memory provided with the \fIbuffer\fP parameter, which
+is \fIbufsize\fP bytes in size. The maximum size needed for this buffer
+can be determined with the {_SC_GETGR_R_SIZE_MAX} \fIsysconf\fP()
+parameter. A NULL pointer shall be returned at the location pointed
+to by
+\fIresult\fP on error or if the requested entry is not found. 
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIgetgrgid\fP() shall return a pointer
+to a \fBstruct group\fP with the structure defined in \fI<grp.h>\fP
+with a matching entry if one is found. The \fIgetgrgid\fP() function
+shall
+return a null pointer if either the requested entry was not found,
+or an error occurred. On error, \fIerrno\fP shall be set to
+indicate the error.
+.LP
+The return value may point to a static area which is overwritten by
+a subsequent call to \fIgetgrent\fP(), \fIgetgrgid\fP(), or \fIgetgrnam\fP().
+.LP
+If successful, the \fIgetgrgid_r\fP() function shall return zero;
+otherwise, an error number shall be returned to indicate the
+error. 
+.SH ERRORS
+.LP
+The \fIgetgrgid\fP() and \fIgetgrgid_r\fP() functions may fail if:
+.TP 7
+.B EIO
+An I/O error has occurred.
+.TP 7
+.B EINTR
+A signal was caught during \fIgetgrgid\fP().
+.TP 7
+.B EMFILE
+{OPEN_MAX} file descriptors are currently open in the calling process.
+.TP 7
+.B ENFILE
+The maximum allowable number of files is currently open in the system.
+.sp
+.LP
+The \fIgetgrgid_r\fP() function may fail if: 
+.TP 7
+.B ERANGE
+Insufficient storage was supplied via \fIbuffer\fP and \fIbufsize\fP
+to contain the data to be referenced by the resulting
+\fBgroup\fP structure. 
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.SS Finding an Entry in the Group Database
+.LP
+The following example uses \fIgetgrgid\fP() to search the group database
+for a group ID that was previously stored in a
+\fBstat\fP structure, then prints out the group name if it is found.
+If the group is not found, the program prints the numeric
+value of the group for the entry.
+.sp
+.RS
+.nf
+
+\fB#include <sys/types.h>
+#include <grp.h>
+#include <stdio.h>
+\&...
+struct stat statbuf;
+struct group *grp;
+\&...
+if ((grp = getgrgid(statbuf.st_gid)) != NULL)
+    printf(" %-8.8s", grp->gr_name);
+else
+    printf(" %-8d", statbuf.st_gid);
+\&...
+\fP
+.fi
+.RE
+.SH APPLICATION USAGE
+.LP
+Applications wishing to check for error situations should set \fIerrno\fP
+to 0 before calling \fIgetgrgid\fP(). If
+\fIerrno\fP is set on return, an error occurred.
+.LP
+The \fIgetgrgid_r\fP() function is thread-safe and shall return values
+in a user-supplied buffer instead of possibly using a
+static data area that may be overwritten by each call.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIendgrent\fP(), \fIgetgrnam\fP(), the Base Definitions volume
+of
+IEEE\ Std\ 1003.1-2001, \fI<grp.h>\fP, \fI<limits.h>\fP, \fI<sys/types.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. 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 Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .