newlib-cygwin/newlib/libc/unix/getlogin.c

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#include <string.h>
#include <unistd.h>
2000-02-18 03:39:52 +08:00
#include <sys/types.h>
#include <utmp.h>
#include <fcntl.h>
#include <_syslist.h>
char *
getlogin ()
{
int utmp_fd;
struct utmp utmp_buf;
static char buf[10];
extern char *ttyname ();
char *tty;
if (((tty = ttyname (0)) == 0)
|| ((tty = ttyname (1)) == 0)
|| ((tty = ttyname (2)) == 0))
return 0;
if ((utmp_fd = _open (UTMP_FILE, O_RDONLY)) == -1)
return 0;
if (!strncmp (tty, "/dev/", 5))
tty += 5;
while (_read (utmp_fd, &utmp_buf, sizeof (utmp_buf)) == sizeof (utmp_buf))
{
if (!strncmp (tty, utmp_buf.ut_line, sizeof (utmp_buf.ut_line))
&& utmp_buf.ut_type == USER_PROCESS)
{
_close (utmp_fd);
memset (buf, 0, sizeof (buf));
strncpy (buf, utmp_buf.ut_user, sizeof (utmp_buf.ut_user));
return buf;
}
}
_close (utmp_fd);
return 0;
}