Annotation of prex-old/usr/server/boot/main.c, Revision 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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