Re: chown problem

• Subject: Re: chown problem
• From: Thomas Ingham <email@hidden>
• Date: Fri, 6 Sep 2002 05:58:54 -0400

Hello,

I am running a daemon on startup (so it's running as root), and I would
like to create files and set them to be owned by whomever is logged in
at the console. I wrote this code:

if ( GetFullPathname(&newSpec, pathname, 2 ) )
{
char* loginName = getlogin();
CopyPascalStringToC(pathname, pathname);
strcpy(command, "chown ");
if(loginName)
{
strcat(command, loginName);
strcat(command, " \"");
strcat(command, pathname);
strcat(command, "\"");
sprintf(errorCStr, "chown executing command: %s\n", command);
syslog(1, errorCStr);
err = system(command);
if(0 != err)
{
sprintf(errorCStr, "chown failed, err = %d.\n", err, theErr);
syslog(1, errorCStr);
}
}

When I check to see who owns the file using ls -l, sure enough it is
owned by the current console login, with -rw-r--r-- permissions, but
when I am logged in as that user, rm reports "permission denied" when I
try to delete the file. Can anyone explain why this is happening?

Also, how would I go about getting a list of the groups a user is a
member of, from a c program? I know I could do a system call "id -Gn
username" and write the output to a file, but is there a way to get the
list directly?

Thanks for your help,
Michael
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