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1 /*
2  * Copyright (c) 1998, 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.  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 #include <stdlib.h>
27 #include <unistd.h>
28 #include <string.h>
29 #include <ctype.h>
30 #include "sys.h"
31 #include "util.h"
32 
33 #if defined(LINUX) || defined(_ALLBSD_SOURCE) || defined(AIX)
34   /* Linux, BSD, AIX */
35   #define FORK() fork()
36 #else
37   /* Solaris (make sure we always get the POSIX-specified behavior) */
38   #define FORK() fork1()
39 #endif
40 
skipWhitespace(char * p)41 static char *skipWhitespace(char *p) {
42     while ((*p != '\0') && isspace(*p)) {
43         p++;
44     }
45     return p;
46 }
47 
skipNonWhitespace(char * p)48 static char *skipNonWhitespace(char *p) {
49     while ((*p != '\0') && !isspace(*p)) {
50         p++;
51     }
52     return p;
53 }
54 
55 int
dbgsysExec(char * cmdLine)56 dbgsysExec(char *cmdLine)
57 {
58     int i;
59     int argc;
60     pid_t pid_err = (pid_t)(-1); /* this is the error return value */
61     pid_t pid;
62     char **argv = NULL;
63     char *p;
64     char *args;
65 
66     /* Skip leading whitespace */
67     cmdLine = skipWhitespace(cmdLine);
68 
69     /*LINTED*/
70     args = jvmtiAllocate((jint)strlen(cmdLine)+1);
71     if (args == NULL) {
72         return SYS_NOMEM;
73     }
74     (void)strcpy(args, cmdLine);
75 
76     p = args;
77 
78     argc = 0;
79     while (*p != '\0') {
80         p = skipNonWhitespace(p);
81         argc++;
82         if (*p == '\0') {
83             break;
84         }
85         p = skipWhitespace(p);
86     }
87 
88     /*LINTED*/
89     argv = jvmtiAllocate((argc + 1) * (jint)sizeof(char *));
90     if (argv == 0) {
91         jvmtiDeallocate(args);
92         return SYS_NOMEM;
93     }
94 
95     for (i = 0, p = args; i < argc; i++) {
96         argv[i] = p;
97         p = skipNonWhitespace(p);
98         *p++ = '\0';
99         p = skipWhitespace(p);
100     }
101     argv[i] = NULL;  /* NULL terminate */
102 
103     if ((pid = FORK()) == 0) {
104         /* Child process */
105         int i;
106         long max_fd;
107 
108         /* close everything */
109         max_fd = sysconf(_SC_OPEN_MAX);
110         /*LINTED*/
111         for (i = 3; i < (int)max_fd; i++) {
112             (void)close(i);
113         }
114 
115         (void)execvp(argv[0], argv);
116 
117         exit(-1);
118     }
119     jvmtiDeallocate(args);
120     jvmtiDeallocate(argv);
121     if (pid == pid_err) {
122         return SYS_ERR;
123     } else {
124         return SYS_OK;
125     }
126 }
127