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