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Full Discussion: retrieving all group names with a given group number
Top Forums UNIX for Advanced & Expert Users retrieving all group names with a given group number Post 302240989 by fpmurphy on Saturday 27th of September 2008 01:38:22 PM
Old 09-27-2008
You were nearly there. All you had to do was walk the array of pointers (**gr_mem) to the individual users.
To use a group id instead of a group name, replace getgrnam() with getgrgid()

Code:
#include <stdio.ho
#include <stdlib.h>
#include <grp.h>

int main(int argc, char * argv[])
{
   struct group *info;
   char **members;

   if (argc < 2) {
      fprintf(stderr, "usage: %s groupname\n", argv[0]);
      exit(1);
   }

   if ((info = getgrnam(argv[1])) == (struct group *)NULL) {
       printf("%s: no such group\n", argv[1]);
       exit(2);
   }

   printf("group name: %s\n", info->gr_name);
   printf("group id number: %d\n", info->gr_gid);
   members = info->gr_mem;
   while (*members)
      printf ("group member: %s\n", *members++);
}

~
Last edited by fpmurphy; 09-27-2008 at 02:45 PM..
 

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LEARN ABOUT OPENSOLARIS

grp.h

grp.h(3HEAD)							      Headers							      grp.h(3HEAD)

NAME

       grp.h, grp - group structure

SYNOPSIS

       #include <grp.h>

DESCRIPTION

       The <grp.h> header declares the structure group, which includes the following members:

	 char  *gr_name     /* name of the group */
	 gid_t gr_gid	    /* numerical group ID */
	 char  **gr_mem     /* pointer to a null-terminated array of
			       character pointers to member names */

       The gid_t type is defined as described in <sys/types.h> (see types(3HEAD)).

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getgrnam(3C), types.h(3HEAD), attributes(5), standards(5)

SunOS 5.11							    10 Sep 2004 						      grp.h(3HEAD)
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