Annotation of prex/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
! 36: * 'init' process. It sends a setup message to other servers in
! 37: * order to let them know that this task becomes 'init' process.
! 38: * The bootstrap server is gone after it launches (exec) the
! 39: * 'init' 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: #ifdef DEBUG
! 59: #define DPRINTF(a) sys_log a
! 60: #else
! 61: #define DPRINTF(a)
! 62: #endif
! 63:
! 64: extern const struct fstab fstab[];
! 65: extern const int fstab_size;
! 66:
! 67: #define PRIO_BOOT 131 /* priority of boot server */
! 68:
! 69: /* forward declarations */
! 70: static void wait_server(const char *);
! 71: static void process_init(void);
! 72: static int run_init(char *);
! 73: static void mount_fs(void);
! 74:
! 75: static object_t proc_obj;
! 76:
! 77: static char *init_argv[] = { "arg", NULL };
! 78: static char *init_envp[] = { "HOME=/", NULL };
! 79:
! 80: /*
! 81: * Base directories
! 82: */
! 83: static char *base_dir[] = {
! 84: "/bin", /* essential user commands */
! 85: "/boot", /* static files for boot */
! 86: "/dev", /* device files */
! 87: "/etc", /* system conifguration */
! 88: "/mnt", /* mount point for file systems */
! 89: "/mnt/floppy", /* mount point for floppy */
! 90: "/mnt/cdrom", /* mount point for cdrom */
! 91: "/fifo", /* mount point for fifo */
! 92: "/tmp", /* temporary files */
! 93: "/usr", /* shareable read-only data */
! 94: "/var", /* log files, spool data */
! 95: NULL
! 96: };
! 97:
! 98: /*
! 99: * Main routine for boot strap.
! 100: */
! 101: int
! 102: main(int argc, char *argv[])
! 103: {
! 104:
! 105: sys_log("Starting Bootstrap Server\n");
! 106:
! 107: /*
! 108: * Boost current priority.
! 109: */
! 110: thread_setprio(thread_self(), PRIO_BOOT);
! 111:
! 112: /*
! 113: * Wait until required system servers
! 114: * become available.
! 115: */
! 116: wait_server(OBJNAME_PROC);
! 117: wait_server(OBJNAME_FS);
! 118: wait_server(OBJNAME_EXEC);
! 119:
! 120: /*
! 121: * Register this task to other servers.
! 122: */
! 123: process_init();
! 124: fslib_init();
! 125:
! 126: /*
! 127: * Mount file systems
! 128: */
! 129: mount_fs();
! 130:
! 131: /*
! 132: * Run init process
! 133: */
! 134: run_init("/boot/init");
! 135:
! 136: sys_panic("boot: failed to run init");
! 137: /* NOTREACHED */
! 138: return 0;
! 139: }
! 140:
! 141: /*
! 142: * Wait until specified server starts.
! 143: */
! 144: static void
! 145: wait_server(const char *name)
! 146: {
! 147: int i, err = 0;
! 148: object_t obj = 0;
! 149:
! 150: thread_yield();
! 151:
! 152: /*
! 153: * Wait for server loading. timeout is 2 sec.
! 154: */
! 155: for (i = 0; i < 200; i++) {
! 156: err = object_lookup((char *)name, &obj);
! 157: if (err == 0)
! 158: break;
! 159:
! 160: /* Wait 10msec */
! 161: timer_sleep(10, 0);
! 162: thread_yield();
! 163: }
! 164: if (err)
! 165: sys_panic("boot: server not found");
! 166: }
! 167:
! 168: /*
! 169: * Notify the process server.
! 170: */
! 171: static void
! 172: process_init(void)
! 173: {
! 174: struct msg m;
! 175:
! 176: /*
! 177: * We will become an init process later.
! 178: */
! 179: object_lookup(OBJNAME_PROC, &proc_obj);
! 180: m.hdr.code = PS_SETINIT;
! 181: msg_send(proc_obj, &m, sizeof(m));
! 182: }
! 183:
! 184: /*
! 185: * Run init process
! 186: */
! 187: static int
! 188: run_init(char *path)
! 189: {
! 190: struct exec_msg *msg;
! 191: int err, i, argc, envc;
! 192: size_t bufsz;
! 193: char *dest, *src;
! 194: object_t obj;
! 195:
! 196: DPRINTF(("boot: Run init process\n"));
! 197:
! 198: /*
! 199: * Allocate a message buffer with arg/env data.
! 200: */
! 201: bufsz = 0;
! 202: argc = 0;
! 203: while (init_argv[argc] != NULL) {
! 204: bufsz += (strlen(init_argv[argc]) + 1);
! 205: argc++;
! 206: }
! 207: envc = 0;
! 208: while (init_envp[envc] != NULL) {
! 209: bufsz += (strlen(init_envp[envc]) + 1);
! 210: envc++;
! 211: }
! 212: msg = malloc(sizeof(struct exec_msg) + bufsz);
! 213: if (msg == NULL)
! 214: return -1;
! 215:
! 216: /*
! 217: * Build exec message.
! 218: */
! 219: dest = (char *)&msg->buf;
! 220: for (i = 0; i < argc; i++) {
! 221: src = init_argv[i];
! 222: while ((*dest++ = *src++) != 0);
! 223: }
! 224: for (i = 0; i < envc; i++) {
! 225: src = init_envp[i];
! 226: while ((*dest++ = *src++) != 0);
! 227: }
! 228: msg->argc = argc;
! 229: msg->envc = envc;
! 230: msg->bufsz = bufsz;
! 231: strcpy((char *)&msg->path, path);
! 232:
! 233: /*
! 234: * Request exec() to exec server
! 235: */
! 236: object_lookup(OBJNAME_EXEC, &obj);
! 237: do {
! 238: msg->hdr.code = EX_EXEC;
! 239: err = msg_send(obj, msg,
! 240: sizeof(struct exec_msg) + bufsz);
! 241: /*
! 242: * If exec server can execute new process
! 243: * properly, it will terminate the caller task
! 244: * automatically. So, the control never comes
! 245: * here in that case.
! 246: */
! 247: } while (err == EINTR);
! 248: return -1;
! 249: }
! 250:
! 251: static void
! 252: mount_fs(void)
! 253: {
! 254: int i;
! 255:
! 256: DPRINTF(("boot: Mounting file systems\n"));
! 257:
! 258: /*
! 259: * Mount RAMFS as root file system.
! 260: */
! 261: if (mount("", "/", "ramfs", 0, NULL) < 0)
! 262: sys_panic("boot: mount failed");
! 263:
! 264: /*
! 265: * Create some default directories on RAMFS.
! 266: */
! 267: i = 0;
! 268: while (base_dir[i] != NULL) {
! 269: mkdir(base_dir[i], 0);
! 270: i++;
! 271: }
! 272:
! 273: /*
! 274: * Mount other file systems.
! 275: */
! 276: for (i = 0; i < fstab_size; i++) {
! 277: mount(fstab[i].fs_spec, fstab[i].fs_file,
! 278: fstab[i].fs_vfstype, 0, (void *)fstab[i].fs_mntops);
! 279: }
! 280: }
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