1 /* 2 * Copyright (c) 2013, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #ifndef CHILDPROC_MD_H 27 #define CHILDPROC_MD_H 28 29 #include <sys/types.h> 30 31 #ifdef __APPLE__ 32 #include <crt_externs.h> 33 #define environ (*_NSGetEnviron()) 34 #else 35 /* This is one of the rare times it's more portable to declare an 36 * external symbol explicitly, rather than via a system header. 37 * The declaration is standardized as part of UNIX98, but there is 38 * no standard (not even de-facto) header file where the 39 * declaration is to be found. See: 40 * http://www.opengroup.org/onlinepubs/009695399/functions/environ.html 41 * http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_02.html 42 * 43 * "All identifiers in this volume of IEEE Std 1003.1-2001, except 44 * environ, are defined in at least one of the headers" (!) 45 */ 46 extern char **environ; 47 #endif 48 49 #ifdef __linux__ 50 #include <sched.h> 51 #endif 52 53 #ifndef STDIN_FILENO 54 #define STDIN_FILENO 0 55 #endif 56 57 #ifndef STDOUT_FILENO 58 #define STDOUT_FILENO 1 59 #endif 60 61 #ifndef STDERR_FILENO 62 #define STDERR_FILENO 2 63 #endif 64 65 #ifndef SA_NOCLDSTOP 66 #define SA_NOCLDSTOP 0 67 #endif 68 69 #ifndef SA_RESTART 70 #define SA_RESTART 0 71 #endif 72 73 #define FAIL_FILENO (STDERR_FILENO + 1) 74 75 /* TODO: Refactor. */ 76 #define RESTARTABLE(_cmd, _result) do { \ 77 do { \ 78 _result = _cmd; \ 79 } while((_result == -1) && (errno == EINTR)); \ 80 } while(0) 81 82 /* These numbers must be the same as the Enum in ProcessImpl.java 83 * Must be a better way of doing this. 84 */ 85 #define MODE_FORK 1 86 #define MODE_POSIX_SPAWN 2 87 #define MODE_VFORK 3 88 #define MODE_CLONE 4 89 90 typedef struct _ChildStuff 91 { 92 int in[2]; 93 int out[2]; 94 int err[2]; 95 int fail[2]; 96 int childenv[2]; 97 int fds[3]; 98 int mode; 99 const char **argv; 100 int argc; 101 const char **envv; 102 const char *pdir; 103 int redirectErrorStream; 104 int sendAlivePing; 105 } ChildStuff; 106 107 /* following used in addition when mode is SPAWN */ 108 typedef struct _SpawnInfo { 109 int nargv; /* number of argv array elements */ 110 int argvBytes; /* total number of bytes in argv array */ 111 int nenvv; /* number of envv array elements */ 112 int envvBytes; /* total number of bytes in envv array */ 113 int dirlen; /* length of home directory string */ 114 int nparentPathv; /* number of elements in parentPathv array */ 115 int parentPathvBytes; /* total number of bytes in parentPathv array */ 116 } SpawnInfo; 117 118 /* If ChildStuff.sendAlivePing is true, child shall signal aliveness to 119 * the parent the moment it gains consciousness, before any subsequent 120 * pre-exec errors could happen. 121 * This code must fit into an int and not be a valid errno value on any of 122 * our platforms. */ 123 #define CHILD_IS_ALIVE 65535 124 125 /** 126 * The cached and split version of the JDK's effective PATH. 127 * (We don't support putenv("PATH=...") in native code) 128 */ 129 extern const char * const *parentPathv; 130 131 ssize_t restartableWrite(int fd, const void *buf, size_t count); 132 int restartableDup2(int fd_from, int fd_to); 133 int closeSafely(int fd); 134 int isAsciiDigit(char c); 135 int closeDescriptors(void); 136 int moveDescriptor(int fd_from, int fd_to); 137 138 int magicNumber(); 139 ssize_t readFully(int fd, void *buf, size_t nbyte); 140 void initVectorFromBlock(const char**vector, const char* block, int count); 141 void execve_as_traditional_shell_script(const char *file, 142 const char *argv[], 143 const char *const envp[]); 144 void execve_with_shell_fallback(int mode, const char *file, 145 const char *argv[], 146 const char *const envp[]); 147 void JDK_execvpe(int mode, const char *file, 148 const char *argv[], 149 const char *const envp[]); 150 int childProcess(void *arg); 151 152 #endif 153