username.h File Reference

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Go to the source code of this file.

Functions
const char *	get_user_name (char **errstr)
const char *	get_user_name_or_exit (const char *progname)

Function Documentation

get_user_name()

const char * get_user_name

(

char **

errstr

)

Definition at line 31 of file username.c.

{
#ifndef WIN32
    struct passwd *pw;
    uid_t       user_id = geteuid();
 
    *errstr = NULL;
 
    errno = 0;                  /* clear errno before call */
    pw = getpwuid(user_id);
    if (!pw)
    {
        *errstr = psprintf(_("could not look up effective user ID %ld: %s"),
                           (long) user_id,
                           errno ? strerror(errno) : _("user does not exist"));
        return NULL;
    }
 
    return pw->pw_name;
#else
    /* Microsoft recommends buffer size of UNLEN+1, where UNLEN = 256 */
    /* "static" variable remains after function exit */
    static char username[256 + 1];
    DWORD       len = sizeof(username);
 
    *errstr = NULL;
 
    if (!GetUserName(username, &len))
    {
        *errstr = psprintf(_("user name lookup failure: error code %lu"),
                           GetLastError());
        return NULL;
    }
 
    return username;
#endif
}

References _, len, psprintf(), strerror, and username.

Referenced by get_user_info(), and get_user_name_or_exit().

get_user_name_or_exit()

const char * get_user_name_or_exit

(

const char *

progname

)

Definition at line 74 of file username.c.

{
    const char *user_name;
    char       *errstr;
 
    user_name = get_user_name(&errstr);
 
    if (!user_name)
    {
        fprintf(stderr, "%s: %s\n", progname, errstr);
        exit(1);
    }
    return user_name;
}

References fprintf, get_user_name(), and progname.

Referenced by get_id(), and main().