/* Utilities to execute a program in a subprocess (possibly linked by pipes with other subprocesses), and wait for it. Shared logic. 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. */ #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