Attachment 59617 Details for Bug 136490

Usage: ./getent_test <groupname>; compile: g++ -o getent_test getent_test.cpp

getent_test.cpp (text/plain), 2.01 KB, created by Tobias Burnus on 2005-12-01 20:27:20 UTC

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Creator: Tobias Burnus

Created: 2005-12-01 20:27:20 UTC

Size: 2.01 KB

patch

obsolete

>#include <stdio.h>
>#include <unistd.h>
>#include <sys/types.h>
>#include <grp.h>
>#include <linux/errno.h>
>
>/* copied from glibc */
>void print_group (struct group *grp)
>{
>  unsigned int i = 0;
>  printf("Ok, start printing the group\n");
>  if(grp == NULL) { printf("grp == NULL\n"); return;}
>  if(grp->gr_name == NULL) { printf("grp->gr_name == NULL\n"); return;}
>  if(grp->gr_passwd == NULL) { printf("grp->gr_passwd == NULL\n"); return;}
>
>  printf ("%s:%s:%lu:", grp->gr_name ? grp->gr_name : "",
>          grp->gr_passwd ? grp->gr_passwd : "",
>          (unsigned long int) grp->gr_gid);
>
>  while (grp->gr_mem[i] != NULL)
>    {
>      fputs_unlocked (grp->gr_mem[i], stdout);
>      ++i;
>      if (grp->gr_mem[i] != NULL)
>        putchar_unlocked (',');
>    }
>  putchar_unlocked ('\n');
>}
>
>
>/* call getgrnam_r using a buffer of the pasted size */
>void mygetgrnam(char *group, size_t size) {
>  char *buf = new char(size);
>  struct group *gbufp;
>  struct group gbuf;
>
>  int res = getgrnam_r(group, &gbuf, buf, size, &gbufp);
>
>  printf("mygetgrnam(\"%s\", %d) returned: ", group, size);
>
>  switch(res) {
>    case 0:      printf("0 (ok)\n"); break;
>    case ENOENT: printf("ENOENT\n"); break;
>    case EINTR:  printf("EINTR\n"); break;
>    case EIO:    printf("EIO\n"); break;
>    case EMFILE: printf("EMFILE\n"); break;
>    case ENOMEM: printf("ENOMEM\n"); break;
>    case ERANGE: printf("ERANGE\n"); break;
>    default:     printf("%d\n", res); break;
>  }
>  if(group == NULL)  { printf("group == NULL"); return;}
>  if(size <= 0)  { printf("size <= 0"); return;}
>  if(buf == NULL)    { printf(  "buf == NULL"); return;}
>  if(&gbuf == NULL)  { printf( "gbuf == NULL"); return;}
>  if(&gbufp == NULL) { printf("gbufp == NULL"); return;}
>  if(res == 0) print_group(&gbuf);
>  delete buf;
>}
>
>int main(int argc, char *argv[]) {
>  if(argc < 2) {
>     printf("USAGE: getent groupname\n\n");
>     return 1;
>  }
>  long sys = sysconf(_SC_GETGR_R_SIZE_MAX);
>  printf("_SC_GETGR_R_SIZE_MAX = %ld\n", sys*2);
>
>  mygetgrnam(argv[1], sys);
>
>  printf("\nDONE\n\n");
>  return 0;
>}

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Attachments on bug 136490: 59617