[deliverable/binutils-gdb.git] / libiberty / pex-djgpp.c

/* Utilities to execute a program in a subprocess (possibly linked by pipes
   with other subprocesses), and wait for it.  DJGPP specialization.
   Copyright (C) 1996-2019 Free Software Foundation, Inc.

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 "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
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <process.h>

/* Use ECHILD if available, otherwise use EINVAL.  */
#ifdef ECHILD
#define PWAIT_ERROR ECHILD
#else
#define PWAIT_ERROR EINVAL
#endif

static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int);
static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *,
				  char * const *, char * const *,
				  int, int, int, int,
				  const char **, int *);
static int pex_djgpp_close (struct pex_obj *, int);
static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
			   int, const char **, int *);

/* The list of functions we pass to the common routines.  */

const struct pex_funcs funcs =
{
  pex_djgpp_open_read,
  pex_djgpp_open_write,
  pex_djgpp_exec_child,
  pex_djgpp_close,
  pex_djgpp_wait,
  NULL, /* pipe */
  NULL, /* fdopenr */
  NULL, /* fdopenw */
  NULL  /* cleanup */
};

/* Return a newly initialized pex_obj structure.  */

struct pex_obj *
pex_init (int flags, const char *pname, const char *tempbase)
{
  /* DJGPP does not support pipes.  */
  flags &= ~ PEX_USE_PIPES;
  return pex_init_common (flags, pname, tempbase, &funcs);
}

/* Open a file for reading.  */

static int
pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
		     const char *name, int binary)
{
  return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
}

/* Open a file for writing.  */

static int
pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
		      const char *name, int binary, int append)
{
  /* Note that we can't use O_EXCL here because gcc may have already
     created the temporary file via make_temp_file.  */
  if (append)
    return -1;
  return open (name,
	       (O_WRONLY | O_CREAT | O_TRUNC
		| (binary ? O_BINARY : O_TEXT)),
	       S_IRUSR | S_IWUSR);
}

/* Close a file.  */

static int
pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
{
  return close (fd);
}

/* Execute a child.  */

static pid_t
pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
		      char * const * argv, char * const * env,
                      int in, int out, int errdes,
		      int toclose ATTRIBUTE_UNUSED, const char **errmsg,
		      int *err)
{
  int org_in, org_out, org_errdes;
  int status;
  int *statuses;

  org_in = -1;
  org_out = -1;
  org_errdes = -1;

  if (in != STDIN_FILE_NO)
    {
      org_in = dup (STDIN_FILE_NO);
      if (org_in < 0)
	{
	  *err = errno;
	  *errmsg = "dup";
	  return (pid_t) -1;
	}
      if (dup2 (in, STDIN_FILE_NO) < 0)
	{
	  *err = errno;
	  *errmsg = "dup2";
	  return (pid_t) -1;
	}
      if (close (in) < 0)
	{
	  *err = errno;
	  *errmsg = "close";
	  return (pid_t) -1;
	}
    }

  if (out != STDOUT_FILE_NO)
    {
      org_out = dup (STDOUT_FILE_NO);
      if (org_out < 0)
	{
	  *err = errno;
	  *errmsg = "dup";
	  return (pid_t) -1;
	}
      if (dup2 (out, STDOUT_FILE_NO) < 0)
	{
	  *err = errno;
	  *errmsg = "dup2";
	  return (pid_t) -1;
	}
      if (close (out) < 0)
	{
	  *err = errno;
	  *errmsg = "close";
	  return (pid_t) -1;
	}
    }

  if (errdes != STDERR_FILE_NO
      || (flags & PEX_STDERR_TO_STDOUT) != 0)
    {
      org_errdes = dup (STDERR_FILE_NO);
      if (org_errdes < 0)
	{
	  *err = errno;
	  *errmsg = "dup";
	  return (pid_t) -1;
	}
      if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
		 STDERR_FILE_NO) < 0)
	{
	  *err = errno;
	  *errmsg = "dup2";
	  return (pid_t) -1;
	}
      if (errdes != STDERR_FILE_NO)
	{
	  if (close (errdes) < 0)
	    {
	      *err = errno;
	      *errmsg = "close";
	      return (pid_t) -1;
	    }
	}
    }

  if (env)
    status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
	      (P_WAIT, executable, argv, env));
  else
    status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
  	      (P_WAIT, executable, argv));

  if (status == -1)
    {
      *err = errno;
      *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
    }

  if (in != STDIN_FILE_NO)
    {
      if (dup2 (org_in, STDIN_FILE_NO) < 0)
	{
	  *err = errno;
	  *errmsg = "dup2";
	  return (pid_t) -1;
	}
      if (close (org_in) < 0)
	{
	  *err = errno;
	  *errmsg = "close";
	  return (pid_t) -1;
	}
    }

  if (out != STDOUT_FILE_NO)
    {
      if (dup2 (org_out, STDOUT_FILE_NO) < 0)
	{
	  *err = errno;
	  *errmsg = "dup2";
	  return (pid_t) -1;
	}
      if (close (org_out) < 0)
	{
	  *err = errno;
	  *errmsg = "close";
	  return (pid_t) -1;
	}
    }

  if (errdes != STDERR_FILE_NO
      || (flags & PEX_STDERR_TO_STDOUT) != 0)
    {
      if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
	{
	  *err = errno;
	  *errmsg = "dup2";
	  return (pid_t) -1;
	}
      if (close (org_errdes) < 0)
	{
	  *err = errno;
	  *errmsg = "close";
	  return (pid_t) -1;
	}
    }

  /* Save the exit status for later.  When we are called, obj->count
     is the number of children which have executed before this
     one.  */
  statuses = (int *) obj->sysdep;
  statuses = XRESIZEVEC (int, statuses, obj->count + 1);
  statuses[obj->count] = status;
  obj->sysdep = (void *) statuses;

  return (pid_t) obj->count;
}

/* Wait for a child process to complete.  Actually the child process
   has already completed, and we just need to return the exit
   status.  */

static pid_t
pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status,
		struct pex_time *time, int done ATTRIBUTE_UNUSED,
		const char **errmsg ATTRIBUTE_UNUSED,
		int *err ATTRIBUTE_UNUSED)
{
  int *statuses;

  if (time != NULL)
    memset (time, 0, sizeof *time);

  statuses = (int *) obj->sysdep;
  *status = statuses[pid];

  return 0;
}
Commit	Line	Data
	1	/* Utilities to execute a program in a subprocess (possibly linked by pipes
	2	with other subprocesses), and wait for it. DJGPP specialization.
	3	Copyright (C) 1996-2019 Free Software Foundation, Inc.
	4
	5	This file is part of the libiberty library.
	6	Libiberty is free software; you can redistribute it and/or
	7	modify it under the terms of the GNU Library General Public
	8	License as published by the Free Software Foundation; either
	9	version 2 of the License, or (at your option) any later version.
	10
	11	Libiberty is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Library General Public License for more details.
	15
	16	You should have received a copy of the GNU Library General Public
	17	License along with libiberty; see the file COPYING.LIB. If not,
	18	write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
	19	Boston, MA 02110-1301, USA. */
	20
	21	#include "pex-common.h"
	22
	23	#include <stdio.h>
	24	#include <errno.h>
	25	#ifdef NEED_DECLARATION_ERRNO
	26	extern int errno;
	27	#endif
	28	#ifdef HAVE_STDLIB_H
	29	#include <stdlib.h>
	30	#endif
	31	#include <string.h>
	32	#include <fcntl.h>
	33	#include <unistd.h>
	34	#include <sys/stat.h>
	35	#include <process.h>
	36
	37	/* Use ECHILD if available, otherwise use EINVAL. */
	38	#ifdef ECHILD
	39	#define PWAIT_ERROR ECHILD
	40	#else
	41	#define PWAIT_ERROR EINVAL
	42	#endif
	43
	44	static int pex_djgpp_open_read (struct pex_obj , const char , int);
	45	static int pex_djgpp_open_write (struct pex_obj , const char , int, int);
	46	static pid_t pex_djgpp_exec_child (struct pex_obj , int, const char ,
	47	char * const , char const *,
	48	int, int, int, int,
	49	const char *, int );
	50	static int pex_djgpp_close (struct pex_obj *, int);
	51	static pid_t pex_djgpp_wait (struct pex_obj , pid_t, int , struct pex_time *,
	52	int, const char *, int );
	53
	54	/* The list of functions we pass to the common routines. */
	55
	56	const struct pex_funcs funcs =
	57	{
	58	pex_djgpp_open_read,
	59	pex_djgpp_open_write,
	60	pex_djgpp_exec_child,
	61	pex_djgpp_close,
	62	pex_djgpp_wait,
	63	NULL, /* pipe */
	64	NULL, /* fdopenr */
	65	NULL, /* fdopenw */
	66	NULL /* cleanup */
	67	};
	68
	69	/* Return a newly initialized pex_obj structure. */
	70
	71	struct pex_obj *
	72	pex_init (int flags, const char pname, const char tempbase)
	73	{
	74	/* DJGPP does not support pipes. */
	75	flags &= ~ PEX_USE_PIPES;
	76	return pex_init_common (flags, pname, tempbase, &funcs);
	77	}
	78
	79	/* Open a file for reading. */
	80
	81	static int
	82	pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
	83	const char *name, int binary)
	84	{
	85	return open (name, O_RDONLY \| (binary ? O_BINARY : O_TEXT));
	86	}
	87
	88	/* Open a file for writing. */
	89
	90	static int
	91	pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
	92	const char *name, int binary, int append)
	93	{
	94	/* Note that we can't use O_EXCL here because gcc may have already
	95	created the temporary file via make_temp_file. */
	96	if (append)
	97	return -1;
	98	return open (name,
	99	(O_WRONLY \| O_CREAT \| O_TRUNC
	100	\| (binary ? O_BINARY : O_TEXT)),
	101	S_IRUSR \| S_IWUSR);
	102	}
	103
	104	/* Close a file. */
	105
	106	static int
	107	pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
	108	{
	109	return close (fd);
	110	}
	111
	112	/* Execute a child. */
	113
	114	static pid_t
	115	pex_djgpp_exec_child (struct pex_obj obj, int flags, const char executable,
	116	char * const * argv, char * const * env,
	117	int in, int out, int errdes,
	118	int toclose ATTRIBUTE_UNUSED, const char **errmsg,
	119	int *err)
	120	{
	121	int org_in, org_out, org_errdes;
	122	int status;
	123	int *statuses;
	124
	125	org_in = -1;
	126	org_out = -1;
	127	org_errdes = -1;
	128
	129	if (in != STDIN_FILE_NO)
	130	{
	131	org_in = dup (STDIN_FILE_NO);
	132	if (org_in < 0)
	133	{
	134	*err = errno;
	135	*errmsg = "dup";
	136	return (pid_t) -1;
	137	}
	138	if (dup2 (in, STDIN_FILE_NO) < 0)
	139	{
	140	*err = errno;
	141	*errmsg = "dup2";
	142	return (pid_t) -1;
	143	}
	144	if (close (in) < 0)
	145	{
	146	*err = errno;
	147	*errmsg = "close";
	148	return (pid_t) -1;
	149	}
	150	}
	151
	152	if (out != STDOUT_FILE_NO)
	153	{
	154	org_out = dup (STDOUT_FILE_NO);
	155	if (org_out < 0)
	156	{
	157	*err = errno;
	158	*errmsg = "dup";
	159	return (pid_t) -1;
	160	}
	161	if (dup2 (out, STDOUT_FILE_NO) < 0)
	162	{
	163	*err = errno;
	164	*errmsg = "dup2";
	165	return (pid_t) -1;
	166	}
	167	if (close (out) < 0)
	168	{
	169	*err = errno;
	170	*errmsg = "close";
	171	return (pid_t) -1;
	172	}
	173	}
	174
	175	if (errdes != STDERR_FILE_NO
	176	\|\| (flags & PEX_STDERR_TO_STDOUT) != 0)
	177	{
	178	org_errdes = dup (STDERR_FILE_NO);
	179	if (org_errdes < 0)
	180	{
	181	*err = errno;
	182	*errmsg = "dup";
	183	return (pid_t) -1;
	184	}
	185	if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
	186	STDERR_FILE_NO) < 0)
	187	{
	188	*err = errno;
	189	*errmsg = "dup2";
	190	return (pid_t) -1;
	191	}
	192	if (errdes != STDERR_FILE_NO)
	193	{
	194	if (close (errdes) < 0)
	195	{
	196	*err = errno;
	197	*errmsg = "close";
	198	return (pid_t) -1;
	199	}
	200	}
	201	}
	202
	203	if (env)
	204	status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
	205	(P_WAIT, executable, argv, env));
	206	else
	207	status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
	208	(P_WAIT, executable, argv));
	209
	210	if (status == -1)
	211	{
	212	*err = errno;
	213	*errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
	214	}
	215
	216	if (in != STDIN_FILE_NO)
	217	{
	218	if (dup2 (org_in, STDIN_FILE_NO) < 0)
	219	{
	220	*err = errno;
	221	*errmsg = "dup2";
	222	return (pid_t) -1;
	223	}
	224	if (close (org_in) < 0)
	225	{
	226	*err = errno;
	227	*errmsg = "close";
	228	return (pid_t) -1;
	229	}
	230	}
	231
	232	if (out != STDOUT_FILE_NO)
	233	{
	234	if (dup2 (org_out, STDOUT_FILE_NO) < 0)
	235	{
	236	*err = errno;
	237	*errmsg = "dup2";
	238	return (pid_t) -1;
	239	}
	240	if (close (org_out) < 0)
	241	{
	242	*err = errno;
	243	*errmsg = "close";
	244	return (pid_t) -1;
	245	}
	246	}
	247
	248	if (errdes != STDERR_FILE_NO
	249	\|\| (flags & PEX_STDERR_TO_STDOUT) != 0)
	250	{
	251	if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
	252	{
	253	*err = errno;
	254	*errmsg = "dup2";
	255	return (pid_t) -1;
	256	}
	257	if (close (org_errdes) < 0)
	258	{
	259	*err = errno;
	260	*errmsg = "close";
	261	return (pid_t) -1;
	262	}
	263	}
	264
	265	/* Save the exit status for later. When we are called, obj->count
	266	is the number of children which have executed before this
	267	one. */
	268	statuses = (int *) obj->sysdep;
	269	statuses = XRESIZEVEC (int, statuses, obj->count + 1);
	270	statuses[obj->count] = status;
	271	obj->sysdep = (void *) statuses;
	272
	273	return (pid_t) obj->count;
	274	}
	275
	276	/* Wait for a child process to complete. Actually the child process
	277	has already completed, and we just need to return the exit
	278	status. */
	279
	280	static pid_t
	281	pex_djgpp_wait (struct pex_obj obj, pid_t pid, int status,
	282	struct pex_time *time, int done ATTRIBUTE_UNUSED,
	283	const char **errmsg ATTRIBUTE_UNUSED,
	284	int *err ATTRIBUTE_UNUSED)
	285	{
	286	int *statuses;
	287
	288	if (time != NULL)
	289	memset (time, 0, sizeof *time);
	290
	291	statuses = (int *) obj->sysdep;
	292	*status = statuses[pid];
	293
	294	return 0;
	295	}