kc3-lang/gnulib/lib/execl.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/execl.c

• /* execl() function: Execute a program, replacing the current process.
     Copyright (C) 2020-2023 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 2.1 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/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2020.  */
  
  /* Don't use __attribute__ __nonnull__ in this compilation unit.  Otherwise gcc
     may optimize away the arg0 == NULL test below.  */
  #define _GL_ARG_NONNULL(params)
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  #include <errno.h>
  #include <stdarg.h>
  
  #include "malloca.h"
  
  int
  execl (const char *program, const char *arg0, ...)
  {
    va_list args;
  
    /* The callee is not expecting a NULL argv[0].  */
    if (arg0 == NULL)
      {
        errno = EINVAL;
        return -1;
      }
  
    /* Count the number of arguments (including arg0 and the trailing NULL).  */
    size_t count = 1;
    va_start (args, arg0);
    for (;;)
      {
        count++;
        if (va_arg (args, const char *) == NULL)
          break;
      }
    va_end (args);
  
    /* Allocate the argument vector.  */
    const char **argv = (const char **) malloca (count * sizeof (const char *));
    if (argv == NULL)
      {
        errno = ENOMEM;
        return -1;
      }
  
    /* Copy the arguments into the argument vector.  */
    {
      size_t i = 0;
      argv[i++] = arg0;
      va_start (args, arg0);
      for (; i < count;)
        argv[i++] = va_arg (args, const char *);
      va_end (args);
    }
  
    /* Invoke execv.  */
    execv (program, argv);
  
    /* If execv returned, it must have failed.  */
    int saved_errno = errno;
    freea (argv);
    errno = saved_errno;
    return -1;
  }
  

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