diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/getlogin_r.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/getlogin_r.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/getlogin_r.c b/REORG.TODO/sysdeps/unix/getlogin_r.c new file mode 100644 index 0000000000..4a6a40eeb2 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/getlogin_r.c @@ -0,0 +1,103 @@ +/* Reentrant function to return the current login name. Unix version. + Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <unistd.h> +#include <string.h> +#include <stdio.h> +#include <limits.h> +#include <fcntl.h> + +#include <utmp.h> +#include "../login/utmp-private.h" + +/* Return at most NAME_LEN characters of the login name of the user in NAME. + If it cannot be determined or some other error occurred, return the error + code. Otherwise return 0. */ + +#ifdef STATIC +STATIC +#endif +int +__getlogin_r (char *name, size_t name_len) +{ + char tty_pathname[2 + 2 * NAME_MAX]; + char *real_tty_path = tty_pathname; + int result; + struct utmp *ut, line, buffer; + + /* Get name of tty connected to fd 0. Return 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(). */ + + result = __ttyname_r (0, real_tty_path, sizeof (tty_pathname)); + + if (result != 0) + return result; + + real_tty_path += 5; /* Remove "/dev/". */ + strncpy (line.ut_line, real_tty_path, sizeof line.ut_line); + + /* We don't use the normal entry points __setutent et al, because we + want setutent + getutline_r + endutent all to happen with the lock + held so that our search is thread-safe. */ + + __libc_lock_lock (__libc_utmp_lock); + (*__libc_utmp_jump_table->setutent) (); + result = (*__libc_utmp_jump_table->getutline_r) (&line, &buffer, &ut); + if (result < 0) + { + if (errno == ESRCH) + /* The caller expects ENOENT if nothing is found. */ + result = ENOENT; + else + result = errno; + } + (*__libc_utmp_jump_table->endutent) (); + __libc_utmp_jump_table = &__libc_utmp_unknown_functions; + __libc_lock_unlock (__libc_utmp_lock); + + if (result == 0) + { + size_t needed = strlen (ut->ut_user) + 1; + + if (needed > name_len) + { + __set_errno (ERANGE); + result = ERANGE; + } + else + { + memcpy (name, ut->ut_user, needed); + result = 0; + } + } + + return result; +} +#ifndef STATIC +libc_hidden_def (__getlogin_r) +weak_alias (__getlogin_r, getlogin_r) +libc_hidden_weak (getlogin_r) +#endif |