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DEFINITIONS
This source file includes following definitions.
- runprogram
1 /*
2 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
3 * The President and Fellows of Harvard College.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * Sample/test code for running a user program. You can use this for
32 * reference when implementing the execv() system call. Remember though
33 * that execv() needs to do more than this function does.
34 */
35
36 #include <types.h>
37 #include <kern/errno.h>
38 #include <kern/fcntl.h>
39 #include <lib.h>
40 #include <proc.h>
41 #include <current.h>
42 #include <addrspace.h>
43 #include <vm.h>
44 #include <vfs.h>
45 #include <syscall.h>
46 #include <test.h>
47
48 /*
49 * Load program "progname" and start running it in usermode.
50 * Does not return except on error.
51 *
52 * Calls vfs_open on progname and thus may destroy it.
53 */
54 int
55 runprogram(char *progname)
56 {
57 struct addrspace *as;
58 struct vnode *v;
59 vaddr_t entrypoint, stackptr;
60 int result;
61
62 /* Open the file. */
63 result = vfs_open(progname, O_RDONLY, 0, &v);
64 if (result) {
65 return result;
66 }
67
68 /* We should be a new process. */
69 KASSERT(curproc_getas() == NULL);
70
71 /* Create a new address space. */
72 as = as_create();
73 if (as ==NULL) {
74 vfs_close(v);
75 return ENOMEM;
76 }
77
78 /* Switch to it and activate it. */
79 curproc_setas(as);
80 as_activate();
81
82 /* Load the executable. */
83 result = load_elf(v, &entrypoint);
84 if (result) {
85 /* p_addrspace will go away when curproc is destroyed */
86 vfs_close(v);
87 return result;
88 }
89
90 /* Done with the file now. */
91 vfs_close(v);
92
93 /* Define the user stack in the address space */
94 result = as_define_stack(as, &stackptr);
95 if (result) {
96 /* p_addrspace will go away when curproc is destroyed */
97 return result;
98 }
99
100 /* Warp to user mode. */
101 enter_new_process(0 /*argc*/, NULL /*userspace addr of argv*/,
102 stackptr, entrypoint);
103
104 /* enter_new_process does not return. */
105 panic("enter_new_process returned\n");
106 return EINVAL;
107 }
108