1 files changed, 472 insertions, 0 deletions

diff --git a/libiberty/pex-common.c b/libiberty/pex-common.c
new file mode 100644
index 0000000..e02dced
--- /dev/null
+++ b/libiberty/pex-common.c
@@ -0,0 +1,472 @@
+/* Common code for executing a program in a sub-process.
+   Copyright (C) 2005 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., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, 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 = xmalloc (sizeof (*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->count = 0;
+  obj->children = NULL;
+  obj->status = NULL;
+  obj->time = NULL;
+  obj->number_waited = 0;
+  obj->read_output = 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 = xrealloc (obj->remove, obj->remove_count * sizeof (char *));
+  if (allocated)
+    add = (char *) name;
+  else
+    add = xstrdup (name);
+  obj->remove[obj->remove_count - 1] = add;
+}
+
+/* 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)
+{
+  const char *errmsg;
+  int in, out, errdes;
+  char *outname;
+  int outname_allocated;
+  int p[2];
+  long pid;
+
+  in = -1;
+  out = -1;
+  errdes = -1;
+  outname = (char *) orig_outname;
+  outname_allocated = 0;
+
+  /* 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)
+    {
+      if (outname == NULL)
+	{
+	  if (obj->tempbase == NULL)
+	    {
+	      outname = make_temp_file (NULL);
+	      outname_allocated = 1;
+	    }
+	  else
+	    {
+	      int len = strlen (obj->tempbase);
+
+	      if (len >= 6
+		  && strcmp (obj->tempbase + len - 6, "XXXXXX") == 0)
+		outname = xstrdup (obj->tempbase);
+	      else
+		outname = concat (obj->tempbase, "XXXXXX", NULL);
+
+	      outname_allocated = 1;
+
+	      out = mkstemps (outname, 0);
+	      if (out < 0)
+		{
+		  *err = 0;
+		  errmsg = "could not create temporary output file";
+		  goto error_exit;
+		}
+
+	      /* 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);
+	      out = -1;
+	    }
+	}
+      else if ((flags & PEX_SUFFIX) != 0)
+	{
+	  if (obj->tempbase == NULL)
+	    outname = make_temp_file (outname);
+	  else
+	    outname = concat (obj->tempbase, outname, NULL);
+	  outname_allocated = 1;
+	}
+
+      if ((obj->flags & PEX_SAVE_TEMPS) == 0)
+	{
+	  pex_add_remove (obj, outname, outname_allocated);
+	  outname_allocated = 0;
+	}
+
+      if (!outname_allocated)
+	{
+	  obj->next_input_name = outname;
+	  obj->next_input_name_allocated = 0;
+	}
+      else
+	{
+	  obj->next_input_name = outname;
+	  outname_allocated = 0;
+	  obj->next_input_name_allocated = 1;
+	}
+    }
+  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)
+    errdes = STDERR_FILE_NO;
+  else
+    {
+      /* We assume that stderr is in text mode--it certainly shouldn't
+	 be controlled by PEX_BINARY_OUTPUT.  If necessary, we can add
+	 a PEX_BINARY_STDERR flag.  */
+      errdes = obj->funcs->open_write (obj, errname, 0);
+      if (errdes < 0)
+	{
+	  *err = errno;
+	  errmsg = "open error file";
+	  goto error_exit;
+	}
+    }
+
+  /* Run the program.  */
+
+  pid = obj->funcs->exec_child (obj, flags, executable, argv, in, out, errdes,
+				&errmsg, err);
+  if (pid < 0)
+    goto error_exit;
+
+  ++obj->count;
+  obj->children = xrealloc (obj->children, obj->count * sizeof (long));
+  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;
+}
+
+/* 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;
+}
+
+/* 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 = xrealloc (obj->status, obj->count * sizeof (int));
+  if ((obj->flags & PEX_RECORD_TIMES) != 0)
+    obj->time = xrealloc (obj->time, obj->count * sizeof (struct pex_time));
+
+  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)
+{
+  if (obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)
+    obj->funcs->close (obj, obj->next_input);
+
+  /* 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);
+  if (obj->children != NULL)
+    free (obj->children);
+  if (obj->status != NULL)
+    free (obj->status);
+  if (obj->time != NULL)
+    free (obj->time);
+  if (obj->read_output != NULL)
+    fclose (obj->read_output);
+
+  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);
+}