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/* Utilities to execute a program in a subprocess (possibly linked by pipes
with other subprocesses), and wait for it. Shared logic.
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. */
#ifndef PEX_COMMON_H
#define PEX_COMMON_H
#include "config.h"
#include "libiberty.h"
#include <stdio.h>
/* pid_t is may defined by config.h or sys/types.h needs to be
included. */
#if !defined(pid_t) && defined(HAVE_SYS_TYPES_H)
#include <sys/types.h>
#endif
#define install_error_msg "installation problem, cannot exec `%s'"
/* stdin file number. */
#define STDIN_FILE_NO 0
/* stdout file number. */
#define STDOUT_FILE_NO 1
/* stderr file number. */
#define STDERR_FILE_NO 2
/* value of `pipe': port index for reading. */
#define READ_PORT 0
/* value of `pipe': port index for writing. */
#define WRITE_PORT 1
/* The structure used by pex_init and friends. */
struct pex_obj
{
/* Flags. */
int flags;
/* Name of calling program, for error messages. */
const char *pname;
/* Base name to use for temporary files. */
const char *tempbase;
/* Pipe to use as stdin for next process. */
int next_input;
/* File name to use as stdin for next process. */
char *next_input_name;
/* Whether next_input_name was allocated using malloc. */
int next_input_name_allocated;
/* If not -1, stderr pipe from the last process. */
int stderr_pipe;
/* Number of child processes. */
int count;
/* PIDs of child processes; array allocated using malloc. */
pid_t *children;
/* Exit statuses of child processes; array allocated using malloc. */
int *status;
/* Time used by child processes; array allocated using malloc. */
struct pex_time *time;
/* Number of children we have already waited for. */
int number_waited;
/* FILE created by pex_input_file. */
FILE *input_file;
/* FILE created by pex_read_output. */
FILE *read_output;
/* FILE created by pex_read_err. */
FILE *read_err;
/* Number of temporary files to remove. */
int remove_count;
/* List of temporary files to remove; array allocated using malloc
of strings allocated using malloc. */
char **remove;
/* Pointers to system dependent functions. */
const struct pex_funcs *funcs;
/* For use by system dependent code. */
void *sysdep;
};
/* Functions passed to pex_run_common. */
struct pex_funcs
{
/* Open file NAME for reading. If BINARY is non-zero, open in
binary mode. Return >= 0 on success, -1 on error. */
int (*open_read) (struct pex_obj *, const char */* name */, int /* binary */);
/* Open file NAME for writing. If BINARY is non-zero, open in
binary mode. Return >= 0 on success, -1 on error. */
int (*open_write) (struct pex_obj *, const char */* name */,
int /* binary */, int /* append */);
/* Execute a child process. FLAGS, EXECUTABLE, ARGV, ERR are from
pex_run. IN, OUT, ERRDES, TOCLOSE are all descriptors, from
open_read, open_write, or pipe, or they are one of STDIN_FILE_NO,
STDOUT_FILE_NO or STDERR_FILE_NO; if IN, OUT, and ERRDES are not
STD*_FILE_NO, they should be closed. If the descriptor TOCLOSE
is not -1, and the system supports pipes, TOCLOSE should be
closed in the child process. The function should handle the
PEX_STDERR_TO_STDOUT flag. Return >= 0 on success, or -1 on
error and set *ERRMSG and *ERR. */
pid_t (*exec_child) (struct pex_obj *, int /* flags */,
const char */* executable */, char * const * /* argv */,
char * const * /* env */,
int /* in */, int /* out */, int /* errdes */,
int /* toclose */, const char **/* errmsg */,
int */* err */);
/* Close a descriptor. Return 0 on success, -1 on error. */
int (*close) (struct pex_obj *, int);
/* Wait for a child to complete, returning exit status in *STATUS
and time in *TIME (if it is not null). CHILD is from fork. DONE
is 1 if this is called via pex_free. ERRMSG and ERR are as in
fork. Return 0 on success, -1 on error. */
pid_t (*wait) (struct pex_obj *, pid_t /* child */, int * /* status */,
struct pex_time * /* time */, int /* done */,
const char ** /* errmsg */, int * /* err */);
/* Create a pipe (only called if PEX_USE_PIPES is set) storing two
descriptors in P[0] and P[1]. If BINARY is non-zero, open in
binary mode. Return 0 on success, -1 on error. */
int (*pipe) (struct pex_obj *, int * /* p */, int /* binary */);
/* Get a FILE pointer to read from a file descriptor (only called if
PEX_USE_PIPES is set). If BINARY is non-zero, open in binary
mode. Return pointer on success, NULL on error. */
FILE * (*fdopenr) (struct pex_obj *, int /* fd */, int /* binary */);
/* Get a FILE pointer to write to the file descriptor FD (only
called if PEX_USE_PIPES is set). If BINARY is non-zero, open in
binary mode. Arrange for FD not to be inherited by the child
processes. Return pointer on success, NULL on error. */
FILE * (*fdopenw) (struct pex_obj *, int /* fd */, int /* binary */);
/* Free any system dependent data associated with OBJ. May be
NULL if there is nothing to do. */
void (*cleanup) (struct pex_obj *);
};
extern struct pex_obj *pex_init_common (int, const char *, const char *,
const struct pex_funcs *);
#endif
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