STATIC #endif char * getlogin (void) { char tty_pathname[2 + 2 * NAME_MAX]; char *real_tty_path = tty_pathname; int err; char *result = NULL; struct utmp *ut, line, buffer; /* Get name of tty connected to fd 0. Return NULL if not a tty or if fd 0 isn't open. Note that a lot of documentation says that getlogin() is based on the controlling terminal---what they really mean is "the terminal connected to standard input". The getlogin() implementation of DEC Unix, SunOS, Solaris, HP-UX all return NULL if fd 0 has been closed, so this is the compatible thing to do. Note that ttyname(open("/dev/tty")) on those systems returns /dev/tty, so that is not a possible solution for getlogin(). */ err = __ttyname_r (0, real_tty_path, sizeof (tty_pathname)); if (err != 0) { __set_errno (err); return NULL; } real_tty_path += 5; /* Remove "/dev/". */ __setutent (); strncpy (line.ut_line, real_tty_path, sizeof line.ut_line); if (__getutline_r (&line, &buffer, &ut) < 0) { if (errno == ESRCH) /* The caller expects ENOENT if nothing is found. */ __set_errno (ENOENT); result = NULL; } else { strncpy (name, ut->ut_user, UT_NAMESIZE); name[UT_NAMESIZE] = '\0'; result = name; } __endutent (); return result; }
struct utmp * __getutline (const struct utmp *line) { struct utmp *result; if (buffer == NULL) { buffer = (struct utmp *) malloc (sizeof (struct utmp)); if (buffer == NULL) return NULL; } if (__getutline_r (line, buffer, &result) < 0) return NULL; return result; }
int getutline32_r (const struct utmp32 *line, struct utmp32 *buffer, struct utmp32 **result) { struct utmp in64; struct utmp out64; struct utmp *out64p; int ret; utmp_convert32to64 (line, &in64); ret = __getutline_r (&in64, &out64, &out64p); if (ret == -1) { *result = NULL; return -1; } utmp_convert64to32 (out64p, buffer); *result = buffer; return 0; }