Since I don't 100% understand how CIG is supposed to work, I don't know the
right way to fix this. The symptom:
> (user-info "alan")
> (user-info "UnKnOwN")
The problem is that the the code generated by CIG for `%name->user-info'
allocates a bunch of variables and passes the addresses of those variables
in to user_info_name(). user_info_name() looks like this:
int user_info_name(const char *name,
uid_t *uid, gid_t *gid, char **dir, char **shell)
struct passwd *pwd = getpwnam(name);
if( !pwd ) return 0;
*uid = pwd->pw_uid;
*gid = pwd->pw_gid;
*dir = pwd->pw_dir;
*shell = pwd->pw_shell;
Notice that if getpwnam() returns NULL, then nothing is done with those
variable addresses. So the variables are still uninitialized. Next, the
CIG generated code attempts to convert those C values into Scheme48 values.
Since the C value is ininitialized garbage, this conversion sometimes
generates a segmentation fault.
I would -guess- that the fix is to re-write all those routines in
`userinfo1.c'. Although perhaps the answer is for CIG to initialize such
variables with reasonable initial C values.
If the fix is the former, I'll fix it myself and send you the patch. Let
Seems like this is the kind of error that might be lurking in a lot of
places. Someone might want to browse through the code looking for other