Annotation of prex-old/usr/server/boot/main.c, Revision 1.1.1.1
1.1 nbrk 1: /*-
2: * Copyright (c) 2005-2007, Kohsuke Ohtani
3: * All rights reserved.
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 author nor the names of any co-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 AUTHOR 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 AUTHOR 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: * main.c - bootstrap server
32: */
33:
34: /*
35: * A bootstrap server works to setup the POSIX environment for 'init'
36: * process. It sends a setup message to other servers in order to let
37: * them know that this task becomes 'init' process.
38: * The bootstrap server is gone after it launches (exec) the 'init'
39: * process.
40: */
41:
42: #include <prex/prex.h>
43: #include <sys/mount.h>
44: #include <server/fs.h>
45: #include <server/object.h>
46: #include <server/exec.h>
47: #include <server/proc.h>
48: #include <server/stdmsg.h>
49:
50: #include <unistd.h>
51: #include <string.h>
52: #include <stdlib.h>
53: #include <stdio.h>
54: #include <signal.h>
55: #include <errno.h>
56: #include <fstab.h>
57:
58: extern const struct fstab fstab[];
59: extern const int fstab_size;
60:
61: #define PRIO_BOOT 131 /* priority of boot server */
62:
63: /* forward declarations */
64: static void wait_server(const char *);
65: static void process_init(void);
66: static int run_init(char *);
67: static void mount_fs(void);
68:
69: static object_t proc_obj;
70:
71: static char *init_argv[] = { "arg", NULL };
72: static char *init_envp[] = { "HOME=/", NULL };
73:
74: static char *base_dir[] = {
75: "/bin", /* essential user commands */
76: "/boot", /* static files for boot */
77: "/dev", /* device files */
78: "/etc", /* system conifguration */
79: "/mnt", /* mount point for file systems */
80: "/mnt/floppy", /* mount point for floppy */
81: "/mnt/cdrom", /* mount point for cdrom */
82: "/tmp", /* temporary files */
83: "/usr", /* shareable read-only data */
84: "/var", /* log files, spool data */
85: NULL
86: };
87:
88: /*
89: * Main routine for boot strap
90: */
91: int
92: main(int argc, char *argv[])
93: {
94:
95: sys_log("Starting Bootstrap Server\n");
96:
97: /*
98: * Boost current priority.
99: */
100: thread_setprio(thread_self(), PRIO_BOOT);
101:
102: /*
103: * Wait until required system servers become available.
104: */
105: wait_server(OBJNAME_PROC);
106: wait_server(OBJNAME_FS);
107: wait_server(OBJNAME_EXEC);
108:
109: /*
110: * Register this task to other servers.
111: */
112: process_init();
113: fslib_init();
114:
115: /*
116: * Mount file systems
117: */
118: mount_fs();
119:
120: /*
121: * Run init process
122: */
123: run_init("/boot/init");
124:
125: sys_log("boot: failed to run init\n");
126: return 0;
127: }
128:
129: /*
130: * Wait until specified server starts.
131: */
132: static void
133: wait_server(const char *name)
134: {
135: int i, err = 0;
136: object_t obj = 0;
137:
138: thread_yield();
139:
140: /*
141: * Wait for server loading. timeout is 2 sec.
142: */
143: for (i = 0; i < 200; i++) {
144: err = object_lookup((char *)name, &obj);
145: if (err == 0)
146: break;
147:
148: /* Wait 10msec */
149: timer_sleep(10, 0);
150: thread_yield();
151: }
152: if (err)
153: sys_panic("boot: server not found");
154: }
155:
156: static void
157: process_init(void)
158: {
159: struct msg m;
160:
161: /*
162: * This task will become an init process.
163: */
164: object_lookup(OBJNAME_PROC, &proc_obj);
165: m.hdr.code = PS_SETINIT;
166: msg_send(proc_obj, &m, sizeof(m));
167: }
168:
169: /*
170: * Run init process
171: */
172: static int
173: run_init(char *path)
174: {
175: struct exec_msg *msg;
176: int err, i, argc, envc;
177: size_t bufsz;
178: char *dest, *src;
179: object_t obj;
180:
181: sys_log("boot: Run init process\n");
182:
183: /*
184: * Allocate a message buffer with arg/env data.
185: */
186: bufsz = 0;
187: argc = 0;
188: while (init_argv[argc]) {
189: bufsz += (strlen(init_argv[argc]) + 1);
190: argc++;
191: }
192: envc = 0;
193: while (init_envp[envc]) {
194: bufsz += (strlen(init_envp[envc]) + 1);
195: envc++;
196: }
197: msg = (struct exec_msg *)malloc(sizeof(struct exec_msg) + bufsz);
198: if (msg == NULL)
199: return -1;
200:
201: /*
202: * Build exec message.
203: */
204: dest = (char *)&msg->buf;
205: for (i = 0; i < argc; i++) {
206: src = init_argv[i];
207: while ((*dest++ = *src++) != 0);
208: }
209: for (i = 0; i < envc; i++) {
210: src = init_envp[i];
211: while ((*dest++ = *src++) != 0);
212: }
213: msg->argc = argc;
214: msg->envc = envc;
215: msg->bufsz = bufsz;
216: strcpy((char *)&msg->path, path);
217:
218: /*
219: * Request exec() to exec server
220: */
221: object_lookup(OBJNAME_EXEC, &obj);
222: do {
223: msg->hdr.code = EX_EXEC;
224: err = msg_send(obj, msg,
225: sizeof(struct exec_msg) + bufsz);
226: /*
227: * If exec server can execute new process properly, it
228: * will terminate the caller task automatically. So,
229: * the control never comes here in that case.
230: */
231: } while (err == EINTR);
232: return -1;
233: }
234:
235: static void
236: mount_fs(void)
237: {
238: int i;
239:
240: sys_log("boot: Mounting file systems\n");
241:
242: /*
243: * Mount RAMFS as root file system.
244: */
245: if (mount("", "/", "ramfs", 0, NULL) < 0)
246: sys_panic("boot: mount failed");
247:
248: /*
249: * Create some default directories on RAMFS.
250: */
251: for (i = 0;; i++) {
252: if (base_dir[i] == NULL)
253: break;
254: mkdir(base_dir[i], 0);
255: }
256:
257: /*
258: * Mount other file systems.
259: */
260: for (i = 0; i < fstab_size; i++) {
261: mount(fstab[i].fs_spec, fstab[i].fs_file,
262: fstab[i].fs_vfstype, 0, (void *)fstab[i].fs_mntops);
263: }
264: }
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