kc3-lang/gnulib/lib/login_tty.c

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• Hash : 9041103e
  Author :
  Date : 2023-01-21T21:13:20
  

  login_tty: Ensure declaration in <utmp.h>.
  
  * tests/test-utmp-c++.cc: New file.
  * modules/utmp-c++-tests: New file.
  
  * tests/test-utmp.c: New file.
  * modules/utmp-tests: New file.
  
  * lib/login_tty.c: Include <utmp.h>.
  * m4/login_tty.m4: New file.
  (gl_FUNC_LOGIN_TTY): Moved here from m4/pty.m4. Set HAVE_LOGIN_TTY.
  * m4/pty.m4 (gl_FUNC_LOGIN_TTY): Moved to m4/login_tty.m4.
  * modules/login_tty (Files): Add m4/login_tty.m4.
  (Depends-on): Add utmp. Remove pty. Update condition.
  (configure.ac): Update condition. Invoke gl_UTMP_MODULE_INDICATOR
  instead of gl_PTY_MODULE_INDICATOR.
  (Include): List <utmp.h>.
  * doc/glibc-functions/login_tty.texi: Mark the include file diversity as
  fixed.
  * tests/test-login_tty.c: Include <utmp.h>. Don't declare login_tty
  here.
  
  * lib/utmp.in.h: New file.
  * m4/utmp_h.m4: New file.
  * modules/utmp: New file.
  * doc/glibc-headers/utmp.texi: New file.
  * doc/gnulib.texi (Glibc Header File Substitutes): Include it.
  

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• lib/login_tty.c

• /* Assign a given terminal as controlling terminal and as standard input,
     standard output, standard error of the current process.
     Copyright (C) 2010-2023 Free Software Foundation, Inc.
  
     This file 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 3 of the
     License, or (at your option) any later version.
  
     This file 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <utmp.h>
  
  #include <fcntl.h>
  #include <unistd.h>
  #include <sys/ioctl.h>
  
  int
  login_tty (int slave_fd)
  {
    int i;
  
    /* Create a new session.  */
    setsid ();
  
    /* Make fd the controlling terminal for the current process.
       On BSD and OSF/1: There is ioctl TIOCSCTTY for this purpose.
       On Solaris:
         A terminal becomes the controlling terminal of a session
         if it is being open()ed, at a moment when
           1. it is not already the controlling terminal of some session, and
           2. the process that open()s it is a session leader that does not have
              a controlling terminal.
         We assume condition 1, try to ensure condition 2, and then open() it.
     */
    for (i = 0; i < 3; i++)
      if (i != slave_fd)
        close (i);
  #ifdef TIOCSCTTY
    if (ioctl (slave_fd, TIOCSCTTY, NULL) < 0)
      return -1;
  #else
    {
      char *slave_name;
      int dummy_fd;
  
      slave_name = ttyname (slave_fd);
      if (slave_name == NULL)
        return -1;
      dummy_fd = open (slave_name, O_RDWR | O_CLOEXEC);
      if (dummy_fd < 0)
        return -1;
      close (dummy_fd);
    }
  #endif
  
    /* Assign fd to the standard input, standard output, and standard error of
       the current process.  */
    for (i = 0; i < 3; i++)
      if (slave_fd != i)
        if (dup2 (slave_fd, i) < 0)
          return -1;
    if (slave_fd >= 3)
      close (slave_fd);
  
    return 0;
  }
  

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