152 lines
6 KiB
C
152 lines
6 KiB
C
/* Utilities to execute a program in a subprocess (possibly linked by pipes
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with other subprocesses), and wait for it. Shared logic.
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Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifndef PEX_COMMON_H
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#define PEX_COMMON_H
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#include "config.h"
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#include "libiberty.h"
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#include <stdio.h>
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/* pid_t is may defined by config.h or sys/types.h needs to be
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included. */
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#if !defined(pid_t) && defined(HAVE_SYS_TYPES_H)
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#include <sys/types.h>
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#endif
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#define install_error_msg "installation problem, cannot exec `%s'"
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/* stdin file number. */
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#define STDIN_FILE_NO 0
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/* stdout file number. */
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#define STDOUT_FILE_NO 1
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/* stderr file number. */
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#define STDERR_FILE_NO 2
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/* value of `pipe': port index for reading. */
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#define READ_PORT 0
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/* value of `pipe': port index for writing. */
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#define WRITE_PORT 1
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/* The structure used by pex_init and friends. */
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struct pex_obj
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{
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/* Flags. */
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int flags;
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/* Name of calling program, for error messages. */
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const char *pname;
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/* Base name to use for temporary files. */
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const char *tempbase;
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/* Pipe to use as stdin for next process. */
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int next_input;
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/* File name to use as stdin for next process. */
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char *next_input_name;
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/* Whether next_input_name was allocated using malloc. */
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int next_input_name_allocated;
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/* If not -1, stderr pipe from the last process. */
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int stderr_pipe;
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/* Number of child processes. */
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int count;
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/* PIDs of child processes; array allocated using malloc. */
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pid_t *children;
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/* Exit statuses of child processes; array allocated using malloc. */
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int *status;
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/* Time used by child processes; array allocated using malloc. */
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struct pex_time *time;
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/* Number of children we have already waited for. */
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int number_waited;
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/* FILE created by pex_input_file. */
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FILE *input_file;
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/* FILE created by pex_read_output. */
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FILE *read_output;
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/* FILE created by pex_read_err. */
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FILE *read_err;
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/* Number of temporary files to remove. */
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int remove_count;
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/* List of temporary files to remove; array allocated using malloc
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of strings allocated using malloc. */
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char **remove;
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/* Pointers to system dependent functions. */
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const struct pex_funcs *funcs;
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/* For use by system dependent code. */
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void *sysdep;
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};
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/* Functions passed to pex_run_common. */
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struct pex_funcs
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{
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/* Open file NAME for reading. If BINARY is non-zero, open in
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binary mode. Return >= 0 on success, -1 on error. */
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int (*open_read) (struct pex_obj *, const char */* name */, int /* binary */);
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/* Open file NAME for writing. If BINARY is non-zero, open in
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binary mode. Return >= 0 on success, -1 on error. */
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int (*open_write) (struct pex_obj *, const char */* name */,
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int /* binary */, int /* append */);
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/* Execute a child process. FLAGS, EXECUTABLE, ARGV, ERR are from
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pex_run. IN, OUT, ERRDES, TOCLOSE are all descriptors, from
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open_read, open_write, or pipe, or they are one of STDIN_FILE_NO,
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STDOUT_FILE_NO or STDERR_FILE_NO; if IN, OUT, and ERRDES are not
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STD*_FILE_NO, they should be closed. If the descriptor TOCLOSE
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is not -1, and the system supports pipes, TOCLOSE should be
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closed in the child process. The function should handle the
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PEX_STDERR_TO_STDOUT flag. Return >= 0 on success, or -1 on
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error and set *ERRMSG and *ERR. */
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pid_t (*exec_child) (struct pex_obj *, int /* flags */,
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const char */* executable */, char * const * /* argv */,
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char * const * /* env */,
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int /* in */, int /* out */, int /* errdes */,
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int /* toclose */, const char **/* errmsg */,
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int */* err */);
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/* Close a descriptor. Return 0 on success, -1 on error. */
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int (*close) (struct pex_obj *, int);
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/* Wait for a child to complete, returning exit status in *STATUS
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and time in *TIME (if it is not null). CHILD is from fork. DONE
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is 1 if this is called via pex_free. ERRMSG and ERR are as in
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fork. Return 0 on success, -1 on error. */
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pid_t (*wait) (struct pex_obj *, pid_t /* child */, int * /* status */,
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struct pex_time * /* time */, int /* done */,
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const char ** /* errmsg */, int * /* err */);
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/* Create a pipe (only called if PEX_USE_PIPES is set) storing two
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descriptors in P[0] and P[1]. If BINARY is non-zero, open in
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binary mode. Return 0 on success, -1 on error. */
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int (*pipe) (struct pex_obj *, int * /* p */, int /* binary */);
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/* Get a FILE pointer to read from a file descriptor (only called if
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PEX_USE_PIPES is set). If BINARY is non-zero, open in binary
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mode. Return pointer on success, NULL on error. */
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FILE * (*fdopenr) (struct pex_obj *, int /* fd */, int /* binary */);
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/* Get a FILE pointer to write to the file descriptor FD (only
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called if PEX_USE_PIPES is set). If BINARY is non-zero, open in
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binary mode. Arrange for FD not to be inherited by the child
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processes. Return pointer on success, NULL on error. */
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FILE * (*fdopenw) (struct pex_obj *, int /* fd */, int /* binary */);
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/* Free any system dependent data associated with OBJ. May be
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NULL if there is nothing to do. */
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void (*cleanup) (struct pex_obj *);
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};
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extern struct pex_obj *pex_init_common (int, const char *, const char *,
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const struct pex_funcs *);
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#endif
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