| /* Utilities to execute a program in a subprocess (possibly linked by pipes |
| with other subprocesses), and wait for it. DJGPP specialization. |
| Copyright (C) 1996-2022 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; |
| } |