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581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/* Reentrant function to return the current login name. Unix version.
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Copyright (C) 1991-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <utmp.h>
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#include "../login/utmp-private.h"
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/* Return at most NAME_LEN characters of the login name of the user in NAME.
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If it cannot be determined or some other error occurred, return the error
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code. Otherwise return 0. */
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#ifdef STATIC
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STATIC
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#endif
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int
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__getlogin_r (char *name, size_t name_len)
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{
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char tty_pathname[2 + 2 * NAME_MAX];
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char *real_tty_path = tty_pathname;
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int result;
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struct utmp *ut, line, buffer;
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/* Get name of tty connected to fd 0. Return if not a tty or
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if fd 0 isn't open. Note that a lot of documentation says that
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getlogin() is based on the controlling terminal---what they
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really mean is "the terminal connected to standard input". The
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getlogin() implementation of DEC Unix, SunOS, Solaris, HP-UX all
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return NULL if fd 0 has been closed, so this is the compatible
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thing to do. Note that ttyname(open("/dev/tty")) on those
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systems returns /dev/tty, so that is not a possible solution for
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getlogin(). */
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result = __ttyname_r (0, real_tty_path, sizeof (tty_pathname));
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if (result != 0)
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return result;
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real_tty_path += 5; /* Remove "/dev/". */
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strncpy (line.ut_line, real_tty_path, sizeof line.ut_line);
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/* We don't use the normal entry points __setutent et al, because we
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want setutent + getutline_r + endutent all to happen with the lock
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held so that our search is thread-safe. */
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__libc_lock_lock (__libc_utmp_lock);
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__libc_setutent ();
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result = __libc_getutline_r (&line, &buffer, &ut);
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if (result < 0)
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{
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if (errno == ESRCH)
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/* The caller expects ENOENT if nothing is found. */
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result = ENOENT;
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else
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result = errno;
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}
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__libc_endutent ();
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__libc_lock_unlock (__libc_utmp_lock);
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if (result == 0)
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{
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size_t needed = __strnlen (ut->ut_user, UT_NAMESIZE) + 1;
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if (needed > name_len)
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{
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__set_errno (ERANGE);
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result = ERANGE;
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}
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else
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{
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memcpy (name, ut->ut_user, needed - 1);
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name[needed - 1] = 0;
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result = 0;
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}
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}
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return result;
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}
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#ifndef STATIC
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libc_hidden_def (__getlogin_r)
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weak_alias (__getlogin_r, getlogin_r)
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libc_hidden_weak (getlogin_r)
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#endif
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