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142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/*
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* Copyright (c) 2013, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#ifndef CHILDPROC_MD_H
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#define CHILDPROC_MD_H
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#include <sys/types.h>
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#ifdef __APPLE__
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#include <crt_externs.h>
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#define environ (*_NSGetEnviron())
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#else
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/* This is one of the rare times it's more portable to declare an
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* external symbol explicitly, rather than via a system header.
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* The declaration is standardized as part of UNIX98, but there is
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* no standard (not even de-facto) header file where the
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* declaration is to be found. See:
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* https://pubs.opengroup.org/onlinepubs/009695399/functions/environ.html
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* https://pubs.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_02.html
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*
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* "All identifiers in this volume of IEEE Std 1003.1-2001, except
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* environ, are defined in at least one of the headers" (!)
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*/
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extern char **environ;
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#endif
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#ifdef __linux__
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#include <sched.h>
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#endif
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#ifndef STDIN_FILENO
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#define STDIN_FILENO 0
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#endif
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#ifndef STDOUT_FILENO
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#define STDOUT_FILENO 1
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#endif
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#ifndef STDERR_FILENO
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#define STDERR_FILENO 2
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#endif
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#ifndef SA_NOCLDSTOP
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#define SA_NOCLDSTOP 0
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#endif
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#ifndef SA_RESTART
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#define SA_RESTART 0
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#endif
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#define FAIL_FILENO (STDERR_FILENO + 1)
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/* These numbers must be the same as the Enum in ProcessImpl.java
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* Must be a better way of doing this.
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*/
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#define MODE_FORK 1
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#define MODE_POSIX_SPAWN 2
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#define MODE_VFORK 3
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typedef struct _ChildStuff
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{
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int in[2];
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int out[2];
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int err[2];
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int fail[2];
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int childenv[2];
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int fds[3];
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int mode;
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const char **argv;
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int argc;
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const char **envv;
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const char *pdir;
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int redirectErrorStream;
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int sendAlivePing;
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} ChildStuff;
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/* following used in addition when mode is SPAWN */
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typedef struct _SpawnInfo {
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int nargv; /* number of argv array elements */
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int argvBytes; /* total number of bytes in argv array */
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int nenvv; /* number of envv array elements */
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int envvBytes; /* total number of bytes in envv array */
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int dirlen; /* length of home directory string */
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int nparentPathv; /* number of elements in parentPathv array */
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int parentPathvBytes; /* total number of bytes in parentPathv array */
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} SpawnInfo;
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/* If ChildStuff.sendAlivePing is true, child shall signal aliveness to
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* the parent the moment it gains consciousness, before any subsequent
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* pre-exec errors could happen.
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* This code must fit into an int and not be a valid errno value on any of
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* our platforms. */
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#define CHILD_IS_ALIVE 65535
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/**
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* The cached and split version of the JDK's effective PATH.
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* (We don't support putenv("PATH=...") in native code)
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*/
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extern const char * const *parentPathv;
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ssize_t writeFully(int fd, const void *buf, size_t count);
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int closeSafely(int fd);
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int magicNumber();
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ssize_t readFully(int fd, void *buf, size_t nbyte);
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void initVectorFromBlock(const char**vector, const char* block, int count);
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int childProcess(void *arg);
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#ifdef DEBUG
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/* This method is only used in debug builds for testing MODE_POSIX_SPAWN
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* in the light of abnormal program termination of either the parent JVM
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* or the newly created jspawnhelper child process during the execution of
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* Java_java_lang_ProcessImpl_forkAndExec().
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* See: test/jdk/java/lang/ProcessBuilder/JspawnhelperProtocol.java
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*/
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void jtregSimulateCrash(pid_t child, int stage);
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#endif
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#endif
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