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      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) 1996-2026 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 }
    296