On Sun, Apr 27, 2008 at 6:54 PM, Garrett Cooper <[EMAIL PROTECTED]> wrote:
> On Apr 27, 2008, at 6:37 PM, Mike Frysinger wrote: > > i'm guessing the #! change was an accident. otherwise i've incorporated > > the > > re-order and committed. > > -mike > > > > Ah, the shebang change was intentional but I forgot to remove it. /bin/sh > != /bin/bash on FreeBSD.. > Thanks, > -Garrett > [EMAIL PROTECTED] ~]# id nobody; echo $? uid=99(nobody) gid=99 groups=25(eng),15045(enged),99 1 After looking at id.c for coreutils-5.21 I tied down the issue to getgrgid(3). The errno makes absolutely no sense though, and it seems to have been "fixed" between various kernel versions: [EMAIL PROTECTED] ~]# ./getgr_t_wrapper.sh 42 ($i) not found in /etc/group 99 ($i) not found in /etc/group Error encountered with getgrgid(99): No such file or directory [EMAIL PROTECTED] ~]# uname -a Linux nova-infra-test1 2.6.9-22.0.2.ELsmp #1 SMP Thu Jan 5 17:13:01 EST 2006 i686 i686 i386 GNU/Linux headless-horseman src # ~gcooper/getgr_t_wrapper.sh 42 ($i) not found in /etc/group Error encountered with getgrgid(42): 0, Success 99 ($i) not found in /etc/group Error encountered with getgrgid(99): 0, Success So, the moral of the story I suppose is "don't trust buggy kernels which reporting the wrong errno info via get*[gu]id". I really don't like the fact that the manpage doesn't match the expected behavior though >:(... I attached the test source files and have started an upstream discussion with the folks at kernel.org: < http://bugzilla.kernel.org/show_bug.cgi?id=10573>. -Garrett
getgr_t_wrapper.sh
Description: Bourne shell script
/*
* Author: Garrett Cooper
* Email: garrcoop {at} cisco {dot} com
*
* Description:
*
* A source file used in conjunction with its wrapper to help test
* out the system call, getgrguid(3).
*
* It's been proven that this test fails on some kernel versions
* (2.6.9 with RHEL-5 for instance), in particular when
* getgrguid(3) != getgeguid(3).
*
*/
#include <errno.h>
#include <grp.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
int
main(int argc, char **argv) {
int i;
struct group *grp;
for (i = 1; i < argc; i++) {
if (*(argv+i) != NULL) {
if (0 < strlen( *(argv+i) )) {
unsigned long gid;
sscanf(*(argv+i), "%lu", &gid);
if ( NULL == ( grp = getgrgid(gid)) ) {
printf("Error encountered with getgrgid(%d): %d, %s\n",
gid, errno, strerror(errno));
}
}
}
}
return 0;
}
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