09-27-2008
retrieving all group names with a given group number
hi,
which Unix/C function can i use to retrieve all group names with a particular group id?
The following C code prints out the group id number of a particular group name:
------------------------------------------------------------------------
#include <stdio.h>
#include <grp.h>
int main(int argc, char * argv[]){
struct group * info;
char ** members;
int i=1;
if(argc < 2){
fprintf(stderr, "usage: %s groupname\n", argv[0]);
exit(-1);
}
info = getgrnam(argv[1]);
if(info == NULL){
printf("%s: no such group\n", argv[1]);
}
else{
printf("group name: %s\n", info -> gr_name);
printf("group id number: %d\n", info -> gr_gid);
}
}
------------------------------------------------------------------
% a.out vulcan1
group name: vulcan1
group id number: 15100
% a.out vulcan2
group name: vulcan2
group id number: 15100
% a.out vulcan3
group name: vulcan3
group id number: 15100
///////////////////////////////////////////////////
I'm looking for a C function that returns "vulcan1", "vulcan2", and "vulcan3"
when I pass in the group id of 15100 (there are only 3 groups with group id of 15100).
Thanks
--Andrew
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LEARN ABOUT DEBIAN
pvmflvgrp
LVGROUP(3PVM) PVM Version 3.4 LVGROUP(3PVM)
NAME
pvm_lvgroup - Unenrolls the calling process from a named group.
SYNOPSIS
C int info = pvm_lvgroup( char *group )
Fortran call pvmflvgroup( group, info )
PARAMETERS
group Character string group name of an existing group.
info Integer status code returned by the routine. Values less than zero indicate an error.
DESCRIPTION
The routine pvm_lvgroup unenrolls the calling process from the group named group. If there is an error info will be negative.
If a process leaves a group by calling either pvm_lvgroup or pvm_exit, and later rejoins the same group, the process may be assigned a new
instance number. Old instance numbers are reassigned to processes calling pvm_joingroup.
EXAMPLES
C:
info = pvm_lvgroup( "worker" );
Fortran:
CALL PVMFLVGROUP( 'group2', INFO )
ERRORS
These error conditions can be returned by pvm_lvgroup
PvmSysErr
pvmd not responding.
PvmBadParam
giving a NULL group name.
PvmNoGroup
giving a non-existent group name.
PvmNotInGroup
asking to leave a group you are not a member of.
SEE ALSO
pvm_joingroup(3PVM)
30 August, 1993 LVGROUP(3PVM)