05-27-2013
There is a problem here. ENOTTY is not an error you can get from calling getpwnam().
The problem has to have occurred before that call. Therefore, errno was set to ENOTTY before you called getpwnam().
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IOCTL(2) System Calls Manual IOCTL(2)
NAME
ioctl - control device
SYNOPSIS
#include <sys/ioctl.h>
ioctl(d, request, argp)
int d;
unsigned long request;
char *argp;
DESCRIPTION
Ioctl performs a variety of functions on open descriptors. In particular, many operating characteristics of character special files (e.g.
terminals) may be controlled with ioctl requests. The writeups of various devices in section 4 discuss how ioctl applies to them.
An ioctl request has encoded in it whether the argument is an "in" parameter or "out" parameter, and the size of the argument argp in
bytes. Macros and defines used in specifying an ioctl request are located in the file <sys/ioctl.h>.
RETURN VALUE
If an error has occurred, a value of -1 is returned and errno is set to indicate the error.
ERRORS
Ioctl will fail if one or more of the following are true:
[EBADF] D is not a valid descriptor.
[ENOTTY] D is not associated with a character special device.
[ENOTTY] The specified request does not apply to the kind of object that the descriptor d references.
[EINVAL] Request or argp is not valid.
SEE ALSO
execve(2), fcntl(2), mt(4), tty(4), intro(4N)
4th Berkeley Distribution March 4, 1986 IOCTL(2)