text: /* The MIT License
   *
   * Copyright (C) 2008-2009 Floris Bruynooghe
   *
   * Copyright (C) 2008-2009 Abilisoft Ltd.
   *
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  
  /* Common functions for POSIX process implementations. */
  
  
  #include <Python.h>
  
  #include <limits.h>
  #include <sys/stat.h>
  
  #include "psi.h"
  #include "process.h"
  #include "procfs_utils.h"
  
  
  int
  procfs_check_pid(pid_t pid)
  {
      struct stat stati;
      char *fname;
      int r;
  
      r = psi_asprintf(&fname, "/proc/%d", pid);
      errno = 0;
      r = stat(fname, &stati);
      if (r == -1) {
          if (errno == EACCES)
              PyErr_SetString(PyExc_OSError, "No read access for /proc");
          else if (errno == ENOENT)
              PyErr_Format(PsiExc_NoSuchProcessError,
                           "No such PID: %ld", (long)pid);
          else
              PyErr_SetFromErrnoWithFilename(PyExc_OSError, fname);
      }
      psi_free(fname);
      return r;
  }
  
  
  int
  procfs_read_procfile(char **buf, const pid_t pid, char *fname)
  {
      char *path;
      int r;
  
      *buf = NULL;
      r = psi_asprintf(&path, "/proc/%d/%s", pid, fname);
      if (r == -1)
          return -1;
      r = psi_read_file(buf, path);
      psi_free(path);
      if (r == -1)
          procfs_check_pid(pid);  /* OSError -> NoSuchProcessError if required */
      return r;
  }
  
  
  int
  procfs_argv_from_string(char ***argv,
                          char *argstr,
                          const unsigned int argc)
  {
      char *ptr;
      char *arg;
      char quote;
      unsigned int i;
  
      *argv = (char**)psi_calloc(argc*sizeof(char*));
      if (*argv == NULL)
          return -1;
      ptr = argstr;
      for (i=0; i < argc; i++) {
          while (isspace((int)*ptr) && *ptr != '\0')
              ptr++;
          if (*ptr == '\0')
              break;
          arg = ptr;
          if (*ptr == '\'' || *ptr == '"') {
              quote = *ptr;
              arg++;              /* don't include the quote in the arg */
              do {
                  ptr++;
                  while (*ptr == '\\') /* skip to next unescaped char */
                      ptr += 2;
              } while (*ptr != quote);
              (*argv)[i] = (char*)psi_malloc(ptr - arg + 1);
              if ((*argv)[i] == NULL)
                  return -1;
              strncpy((*argv)[i], arg, ptr-arg);
              *((*argv)[i] + (ptr-arg)) = '\0';
          } else {
              do
                  ptr++;
              while (!isspace((int)*ptr) && *ptr != '\0');
              (*argv)[i] = (char*)psi_malloc(ptr - arg + 1);
              if ((*argv)[i] == NULL)
  
                  return -1;
              strncpy((*argv)[i], arg, ptr-arg);
              *((*argv)[i] + (ptr-arg)) = '\0';
          }
      }
      if (i > INT_MAX)
          return INT_MAX;
      else
          return (int)i;
  }
  