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Diffstat (limited to 'sysdeps/unix/getlogin.c')
-rw-r--r--sysdeps/unix/getlogin.c36
1 files changed, 18 insertions, 18 deletions
diff --git a/sysdeps/unix/getlogin.c b/sysdeps/unix/getlogin.c
index 5a8ad96df2..e23ffa46f5 100644
--- a/sysdeps/unix/getlogin.c
+++ b/sysdeps/unix/getlogin.c
@@ -34,25 +34,21 @@ getlogin (void)
char tty_pathname[2 + 2 * NAME_MAX];
char *real_tty_path = tty_pathname;
char *result = NULL;
- static struct utmp_data utmp_data = { ut_fd: -1 };
+ struct utmp_data utmp_data = { ut_fd: -1 };
+ static char name[UT_NAMESIZE + 1];
struct utmp *ut, line;
- {
- int err = 0;
- int d = __open ("/dev/tty", 0);
- if (d < 0)
- return NULL;
-
- if (__ttyname_r (d, real_tty_path, sizeof (tty_pathname)) < 0)
- err = errno;
- (void) close (d);
-
- if (err != 0)
- {
- errno = err;
- return NULL;
- }
- }
+ /* 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(). */
+ if (__ttyname_r (0, real_tty_path, sizeof (tty_pathname)) < 0)
+ return NULL;
real_tty_path += 5; /* Remove "/dev/". */
@@ -66,7 +62,11 @@ getlogin (void)
result = NULL;
}
else
- result = ut->ut_line;
+ {
+ strncpy (name, ut->ut_user, UT_NAMESIZE);
+ name[UT_NAMESIZE] = '\0';
+ result = name;
+ }
__endutent_r (&utmp_data);