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/* Common code for executing a program in a sub-process.

   Copyright (C) 2005, 2010 Free Software Foundation, Inc.

   Written by Ian Lance Taylor <ian@airs.com>.

This file is part of the libiberty library.

Libiberty is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

Libiberty 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with libiberty; see the file COPYING.LIB.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,

Boston, MA 02110-1301, USA.  */

#include "config.h"

#include "libiberty.h"

#include "pex-common.h"

#include <stdio.h>

#include <errno.h>

#ifdef NEED_DECLARATION_ERRNO

extern int errno;

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifdef HAVE_STRING_H

#include <string.h>

#endif

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

extern int mkstemps (char *, int);

/* This file contains subroutines for the program execution routines

   (pex_init, pex_run, etc.).  This file is compiled on all

   systems.  */

static void pex_add_remove (struct pex_obj *, const char *, int);

static int pex_get_status_and_time (struct pex_obj *, int, const char **,

                                    int *);

/* Initialize a pex_obj structure.  */

struct pex_obj *

pex_init_common (int flags, const char *pname, const char *tempbase,

                 const struct pex_funcs *funcs)

{

  struct pex_obj *obj;

  obj = XNEW (struct pex_obj);

  obj->flags = flags;

  obj->pname = pname;

  obj->tempbase = tempbase;

  obj->next_input = STDIN_FILE_NO;

  obj->next_input_name = NULL;

  obj->next_input_name_allocated = 0;

  obj->stderr_pipe = -1;

  obj->count = 0;

  obj->children = NULL;

  obj->status = NULL;

  obj->time = NULL;

  obj->number_waited = 0;

  obj->input_file = NULL;

  obj->read_output = NULL;

  obj->read_err = NULL;

  obj->remove_count = 0;

  obj->remove = NULL;

  obj->funcs = funcs;

  obj->sysdep = NULL;

  return obj;

}

/* Add a file to be removed when we are done.  */

static void

pex_add_remove (struct pex_obj *obj, const char *name, int allocated)

{

  char *add;

  ++obj->remove_count;

  obj->remove = XRESIZEVEC (char *, obj->remove, obj->remove_count);

  if (allocated)

    add = (char *) name;

  else

    add = xstrdup (name);

  obj->remove[obj->remove_count - 1] = add;

}

/* Generate a temporary file name based on OBJ, FLAGS, and NAME.

   Return NULL if we were unable to reserve a temporary filename.

   If non-NULL, the result is either allocated with malloc, or the

   same pointer as NAME.  */

static char *

temp_file (struct pex_obj *obj, int flags, char *name)

{

  if (name == NULL)

    {

      if (obj->tempbase == NULL)

        {

          name = make_temp_file (NULL);

        }

      else

        {

          int len = strlen (obj->tempbase);

          int out;

          if (len >= 6

              && strcmp (obj->tempbase + len - 6, "XXXXXX") == 0)

            name = xstrdup (obj->tempbase);

          else

            name = concat (obj->tempbase, "XXXXXX", NULL);

          out = mkstemps (name, 0);

          if (out < 0)

            {

              free (name);

              return NULL;

            }

          /* This isn't obj->funcs->close because we got the

             descriptor from mkstemps, not from a function in

             obj->funcs.  Calling close here is just like what

             make_temp_file does.  */

          close (out);

        }

    }

  else if ((flags & PEX_SUFFIX) != 0)

    {

      if (obj->tempbase == NULL)

        name = make_temp_file (name);

      else

        name = concat (obj->tempbase, name, NULL);

    }

  return name;

}

/* As for pex_run (), but permits the environment for the child process

   to be specified. */

const char *

pex_run_in_environment (struct pex_obj *obj, int flags, const char *executable,

                        char * const * argv, char * const * env,

                        const char *orig_outname, const char *errname,

                        int *err)

{

  const char *errmsg;

  int in, out, errdes;

  char *outname;

  int outname_allocated;

  int p[2];

  int toclose;

  pid_t pid;

  in = -1;

  out = -1;

  errdes = -1;

  outname = (char *) orig_outname;

  outname_allocated = 0;

  /* If the user called pex_input_file, close the file now.  */

  if (obj->input_file)

    {

      if (fclose (obj->input_file) == EOF)

        {

          errmsg = "closing pipeline input file";

          goto error_exit;

        }

      obj->input_file = NULL;

    }

  /* Set IN.  */

  if (obj->next_input_name != NULL)

    {

      /* We have to make sure that the previous process has completed

         before we try to read the file.  */

      if (!pex_get_status_and_time (obj, 0, &errmsg, err))

        goto error_exit;

      in = obj->funcs->open_read (obj, obj->next_input_name,

                                  (flags & PEX_BINARY_INPUT) != 0);

      if (in < 0)

        {

          *err = errno;

          errmsg = "open temporary file";

          goto error_exit;

        }

      if (obj->next_input_name_allocated)

        {

          free (obj->next_input_name);

          obj->next_input_name_allocated = 0;

        }

      obj->next_input_name = NULL;

    }

  else

    {

      in = obj->next_input;

      if (in < 0)

        {

          *err = 0;

          errmsg = "pipeline already complete";

          goto error_exit;

        }

    }

  /* Set OUT and OBJ->NEXT_INPUT/OBJ->NEXT_INPUT_NAME.  */

  if ((flags & PEX_LAST) != 0)

    {

      if (outname == NULL)

        out = STDOUT_FILE_NO;

      else if ((flags & PEX_SUFFIX) != 0)

        {

          outname = concat (obj->tempbase, outname, NULL);

          outname_allocated = 1;

        }

      obj->next_input = -1;

    }

  else if ((obj->flags & PEX_USE_PIPES) == 0)

    {

      outname = temp_file (obj, flags, outname);

      if (! outname)

        {

          *err = 0;

          errmsg = "could not create temporary file";

          goto error_exit;

        }

      if (outname != orig_outname)

        outname_allocated = 1;

      if ((obj->flags & PEX_SAVE_TEMPS) == 0)

        {

          pex_add_remove (obj, outname, outname_allocated);

          outname_allocated = 0;

        }

      /* Hand off ownership of outname to the next stage.  */

      obj->next_input_name = outname;

      obj->next_input_name_allocated = outname_allocated;

      outname_allocated = 0;

    }

  else

    {

      if (obj->funcs->pipe (obj, p, (flags & PEX_BINARY_OUTPUT) != 0) < 0)

        {

          *err = errno;

          errmsg = "pipe";

          goto error_exit;

        }

      out = p[WRITE_PORT];

      obj->next_input = p[READ_PORT];

    }

  if (out < 0)

    {

      out = obj->funcs->open_write (obj, outname,

                                    (flags & PEX_BINARY_OUTPUT) != 0);

      if (out < 0)

        {

          *err = errno;

          errmsg = "open temporary output file";

          goto error_exit;

        }

    }

  if (outname_allocated)

    {

      free (outname);

      outname_allocated = 0;

    }

  /* Set ERRDES.  */

  if (errname != NULL && (flags & PEX_STDERR_TO_PIPE) != 0)

    {

      *err = 0;

      errmsg = "both ERRNAME and PEX_STDERR_TO_PIPE specified.";

      goto error_exit;

    }

  if (obj->stderr_pipe != -1)

    {

      *err = 0;

      errmsg = "PEX_STDERR_TO_PIPE used in the middle of pipeline";

      goto error_exit;

    }

  if (errname == NULL)

    {

      if (flags & PEX_STDERR_TO_PIPE)

        {

          if (obj->funcs->pipe (obj, p, (flags & PEX_BINARY_ERROR) != 0) < 0)

            {

              *err = errno;

              errmsg = "pipe";

              goto error_exit;

            }

          errdes = p[WRITE_PORT];

          obj->stderr_pipe = p[READ_PORT];

        }

      else

        {

          errdes = STDERR_FILE_NO;

        }

    }

  else

    {

      errdes = obj->funcs->open_write (obj, errname,

                                       (flags & PEX_BINARY_ERROR) != 0);

      if (errdes < 0)

        {

          *err = errno;

          errmsg = "open error file";

          goto error_exit;

        }

    }

  /* If we are using pipes, the child process has to close the next

     input pipe.  */

  if ((obj->flags & PEX_USE_PIPES) == 0)

    toclose = -1;

  else

    toclose = obj->next_input;

  /* Run the program.  */

  pid = obj->funcs->exec_child (obj, flags, executable, argv, env,

                                in, out, errdes, toclose, &errmsg, err);

  if (pid < 0)

    goto error_exit;

  ++obj->count;

  obj->children = XRESIZEVEC (pid_t, obj->children, obj->count);

  obj->children[obj->count - 1] = pid;

  return NULL;

 error_exit:

  if (in >= 0 && in != STDIN_FILE_NO)

    obj->funcs->close (obj, in);

  if (out >= 0 && out != STDOUT_FILE_NO)

    obj->funcs->close (obj, out);

  if (errdes >= 0 && errdes != STDERR_FILE_NO)

    obj->funcs->close (obj, errdes);

  if (outname_allocated)

    free (outname);

  return errmsg;

}

/* Run a program.  */

const char *

pex_run (struct pex_obj *obj, int flags, const char *executable,

         char * const * argv, const char *orig_outname, const char *errname,

         int *err)

{

  return pex_run_in_environment (obj, flags, executable, argv, NULL,

                                 orig_outname, errname, err);

}

/* Return a FILE pointer for a temporary file to fill with input for

   the pipeline.  */

FILE *

pex_input_file (struct pex_obj *obj, int flags, const char *in_name)

{

  char *name = (char *) in_name;

  FILE *f;

  /* This must be called before the first pipeline stage is run, and

     there must not have been any other input selected.  */

  if (obj->count != 0

      || (obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)

      || obj->next_input_name)

    {

      errno = EINVAL;

      return NULL;

    }

  name = temp_file (obj, flags, name);

  if (! name)

    return NULL;

  f = fopen (name, (flags & PEX_BINARY_OUTPUT) ? "wb" : "w");

  if (! f)

    {

      free (name);

      return NULL;

    }

  obj->input_file = f;

  obj->next_input_name = name;

  obj->next_input_name_allocated = (name != in_name);

  return f;

}

/* Return a stream for a pipe connected to the standard input of the

   first stage of the pipeline.  */

FILE *

pex_input_pipe (struct pex_obj *obj, int binary)

{

  int p[2];

  FILE *f;

  /* You must call pex_input_pipe before the first pex_run or pex_one.  */

  if (obj->count > 0)

    goto usage_error;

  /* You must be using pipes.  Implementations that don't support

     pipes clear this flag before calling pex_init_common.  */

  if (! (obj->flags & PEX_USE_PIPES))

    goto usage_error;

  /* If we have somehow already selected other input, that's a

     mistake.  */

  if ((obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)

      || obj->next_input_name)

    goto usage_error;

  if (obj->funcs->pipe (obj, p, binary != 0) < 0)

    return NULL;

  f = obj->funcs->fdopenw (obj, p[WRITE_PORT], binary != 0);

  if (! f)

    {

      int saved_errno = errno;

      obj->funcs->close (obj, p[READ_PORT]);

      obj->funcs->close (obj, p[WRITE_PORT]);

      errno = saved_errno;

      return NULL;

    }

  obj->next_input = p[READ_PORT];

  return f;

 usage_error:

  errno = EINVAL;

  return NULL;

}

/* Return a FILE pointer for the output of the last program

   executed.  */

FILE *

pex_read_output (struct pex_obj *obj, int binary)

{

  if (obj->next_input_name != NULL)

    {

      const char *errmsg;

      int err;

      /* We have to make sure that the process has completed before we

         try to read the file.  */

      if (!pex_get_status_and_time (obj, 0, &errmsg, &err))

        {

          errno = err;

          return NULL;

        }

      obj->read_output = fopen (obj->next_input_name, binary ? "rb" : "r");

      if (obj->next_input_name_allocated)

        {

          free (obj->next_input_name);

          obj->next_input_name_allocated = 0;

        }

      obj->next_input_name = NULL;

    }

  else

    {

      int o;

      o = obj->next_input;

      if (o < 0 || o == STDIN_FILE_NO)

        return NULL;

      obj->read_output = obj->funcs->fdopenr (obj, o, binary);

      obj->next_input = -1;

    }

  return obj->read_output;

}

FILE *

pex_read_err (struct pex_obj *obj, int binary)

{

  int o;

  o = obj->stderr_pipe;

  if (o < 0 || o == STDIN_FILE_NO)

    return NULL;

  obj->read_err = obj->funcs->fdopenr (obj, o, binary);

  obj->stderr_pipe = -1;

  return obj->read_err;

}

/* Get the exit status and, if requested, the resource time for all

   the child processes.  Return 0 on failure, 1 on success.  */

static int

pex_get_status_and_time (struct pex_obj *obj, int done, const char **errmsg,

                         int *err)

{

  int ret;

  int i;

  if (obj->number_waited == obj->count)

    return 1;

  obj->status = XRESIZEVEC (int, obj->status, obj->count);

  if ((obj->flags & PEX_RECORD_TIMES) != 0)

    obj->time = XRESIZEVEC (struct pex_time, obj->time, obj->count);

  ret = 1;

  for (i = obj->number_waited; i < obj->count; ++i)

    {

      if (obj->funcs->wait (obj, obj->children[i], &obj->status[i],

                            obj->time == NULL ? NULL : &obj->time[i],

                            done, errmsg, err) < 0)

        ret = 0;

    }

  obj->number_waited = i;

  return ret;

}

/* Get exit status of executed programs.  */

int

pex_get_status (struct pex_obj *obj, int count, int *vector)

{

  if (obj->status == NULL)

    {

      const char *errmsg;

      int err;

      if (!pex_get_status_and_time (obj, 0, &errmsg, &err))

        return 0;

    }

  if (count > obj->count)

    {

      memset (vector + obj->count, 0, (count - obj->count) * sizeof (int));

      count = obj->count;

    }

  memcpy (vector, obj->status, count * sizeof (int));

  return 1;

}

/* Get process times of executed programs.  */

int

pex_get_times (struct pex_obj *obj, int count, struct pex_time *vector)

{

  if (obj->status == NULL)

    {

      const char *errmsg;

      int err;

      if (!pex_get_status_and_time (obj, 0, &errmsg, &err))

        return 0;

    }

  if (obj->time == NULL)

    return 0;

  if (count > obj->count)

    {

      memset (vector + obj->count, 0,

              (count - obj->count) * sizeof (struct pex_time));

      count = obj->count;

    }

  memcpy (vector, obj->time, count * sizeof (struct pex_time));

  return 1;

}

/* Free a pex_obj structure.  */

void

pex_free (struct pex_obj *obj)

{

  /* Close pipe file descriptors corresponding to child's stdout and

     stderr so that the child does not hang trying to output something

     while we're waiting for it.  */

  if (obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)

    obj->funcs->close (obj, obj->next_input);

  if (obj->stderr_pipe >= 0 && obj->stderr_pipe != STDIN_FILE_NO)

    obj->funcs->close (obj, obj->stderr_pipe);

  if (obj->read_output != NULL)

    fclose (obj->read_output);

  if (obj->read_err != NULL)

    fclose (obj->read_err);

  /* If the caller forgot to wait for the children, we do it here, to

     avoid zombies.  */

  if (obj->status == NULL)

    {

      const char *errmsg;

      int err;

      obj->flags &= ~ PEX_RECORD_TIMES;

      pex_get_status_and_time (obj, 1, &errmsg, &err);

    }

  if (obj->next_input_name_allocated)

    free (obj->next_input_name);

  free (obj->children);

  free (obj->status);

  free (obj->time);

  if (obj->remove_count > 0)

    {

      int i;

      for (i = 0; i < obj->remove_count; ++i)

        {

          remove (obj->remove[i]);

          free (obj->remove[i]);

        }

      free (obj->remove);

    }

  if (obj->funcs->cleanup != NULL)

    obj->funcs->cleanup (obj);

  free (obj);

}