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Diffstat (limited to 'init')
-rw-r--r--init/init.c186
1 files changed, 97 insertions, 89 deletions
diff --git a/init/init.c b/init/init.c
index 0850cf810..34eca8b77 100644
--- a/init/init.c
+++ b/init/init.c
@@ -45,17 +45,17 @@
//#define DEBUG_INIT
#define CONSOLE "/dev/console" /* Logical system console */
-#define VT_PRIMARY "/dev/tty0" /* Virtual console master */
-#define VT_SECONDARY "/dev/tty1" /* Virtual console master */
-#define VT_LOG "/dev/tty2" /* Virtual console master */
+#define VT_PRIMARY "/dev/tty0" /* Primary virtual console */
+#define VT_SECONDARY "/dev/tty1" /* Virtual console */
+#define VT_LOG "/dev/tty2" /* Virtual console */
+#define SERIAL_CON0 "/dev/ttyS0" /* Primary serial console */
+#define SERIAL_CON1 "/dev/ttyS1" /* Serial console */
#define SHELL "/bin/sh" /* Default shell */
-//#define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
-#define INITSCRIPT "/tmp/foo.sh"
+#define INITSCRIPT "/etc/init.d/rcS" /* Initscript. */
#define PATH_DEFAULT "PATH=/usr/local/sbin:/sbin:/bin:/usr/sbin:/usr/bin"
-static char *console = CONSOLE;
-//static char *first_terminal = "/dev/tty1";
-static char *second_terminal = "/dev/tty2";
+static char *console = VT_PRIMARY;
+static char *second_terminal = VT_SECONDARY;
static char *log = "/dev/tty3";
@@ -114,7 +114,7 @@ void set_term( int fd)
/* input modes */
tty.c_iflag = IGNPAR|ICRNL|IXON|IXOFF|IXANY;
- /* use lineo dicipline 0 */
+ /* use line dicipline 0 */
tty.c_line = 0;
/* output modes */
@@ -129,14 +129,18 @@ void set_term( int fd)
tcsetattr(fd, TCSANOW, &tty);
}
+/* How much memory does this machine have? */
static int mem_total()
{
char s[80];
- char *p;
+ char *p = "/proc/meminfo";
FILE *f;
const char pattern[] = "MemTotal:";
- f = fopen("/proc/meminfo", "r");
+ if ((f = fopen(p, "r")) < 0) {
+ message(log, "Error opening %s: %s\n", p, strerror( errno));
+ return -1;
+ }
while (NULL != fgets(s, 79, f)) {
p = strstr(s, pattern);
if (NULL != p) {
@@ -147,60 +151,53 @@ static int mem_total()
return -1;
}
-static void set_free_pages()
-{
- char s[80];
- FILE *f;
-
- f = fopen("/proc/sys/vm/freepages", "r");
- fgets(s, 79, f);
- if (atoi(s) < 32) {
- fclose(f);
- f = fopen("/proc/sys/vm/freepages", "w");
- fprintf(f, "30\t40\t50\n");
- message(log, "\nIncreased /proc/sys/vm/freepages values to 30/40/50\n");
- }
- fclose(f);
-}
-
-
static void console_init()
{
int fd;
- struct stat statbuf;
int tried_devcons = 0;
- int tried_vtmaster = 0;
+ int tried_vtprimary = 0;
char *s;
- if ((s = getenv("CONSOLE")) != NULL)
+ if ((s = getenv("CONSOLE")) != NULL) {
console = s;
- else {
- console = CONSOLE;
- tried_devcons++;
+/* Apparently the sparc does wierd things... */
+#if defined (__sparc__)
+ if (strncmp( s, "/dev/tty", 8 )==0) {
+ switch( s[8]) {
+ case 'a':
+ s=SERIAL_CON0;
+ break;
+ case 'b':
+ s=SERIAL_CON1;
+ }
+ }
+#endif
+ } else {
+ console = VT_PRIMARY;
+ tried_vtprimary++;
}
- if ( stat(CONSOLE, &statbuf) && S_ISLNK(statbuf.st_mode)) {
- fprintf(stderr, "Yikes! /dev/console does not exist or is a symlink.\n");
- message(log, "Yikes! /dev/console does not exist or is a symlink.\n");
- }
while ((fd = open(console, O_RDONLY | O_NONBLOCK)) < 0) {
+ /* Can't open selected console -- try vt1 */
+ if (!tried_vtprimary) {
+ tried_vtprimary++;
+ console = VT_PRIMARY;
+ continue;
+ }
+ /* Can't open selected console -- try /dev/console */
if (!tried_devcons) {
tried_devcons++;
console = CONSOLE;
continue;
}
- if (!tried_vtmaster) {
- tried_vtmaster++;
- console = VT_PRIMARY;
- continue;
- }
break;
}
if (fd < 0)
+ /* Perhaps we should panic here? */
console = "/dev/null";
else
close(fd);
- message(log, "console=%s\n", console);
+ message(log, "console=%s\n", console );
}
static int waitfor(int pid)
@@ -221,7 +218,7 @@ static pid_t run(const char * const* command,
{
int fd;
pid_t pid;
- const char * const* cmd = command;
+ const char * const* cmd = command+1;
static const char press_enter[] =
"\nPlease press Enter to activate this console. ";
@@ -262,7 +259,7 @@ static pid_t run(const char * const* command,
}
/* Log the process name and args */
- message(log, "Executing pid(%d): '", getpid());
+ message(log, "Starting pid(%d): '", getpid());
while ( *cmd) message(log, "%s ", *cmd++);
message(log, "'\r\n");
@@ -270,12 +267,39 @@ static pid_t run(const char * const* command,
* so nothing further in init.c should be run. */
execvp(*command, (char**)command+1);
- message(log, "Bummer, could not execute '%s'\n", command);
+ message(log, "Bummer, could not run '%s'\n", command);
exit(-1);
}
return pid;
}
+/* Make sure there is enough memory to do something useful. *
+ * Calls swapon if needed so be sure /proc is mounted. */
+static void check_memory()
+{
+ struct stat statbuf;
+ const char* const swap_on_cmd[] =
+ { "/bin/swapon", "swapon", "-a", 0};
+ const char *no_memory =
+ "Sorry, your computer does not have enough memory.\r\n";
+
+ if (mem_total() > 3500)
+ return;
+
+ if (stat("/etc/fstab", &statbuf) == 0) {
+ /* Try to turn on swap */
+ waitfor(run(swap_on_cmd, log, FALSE));
+ if (mem_total() < 3500)
+ goto goodnight;
+ } else
+ goto goodnight;
+ return;
+
+goodnight:
+ message(console, "%s", no_memory);
+ while (1) sleep(1);
+}
+
static void shutdown_system(void)
{
const char* const swap_off_cmd[] = { "swapoff", "swapoff", "-a", 0};
@@ -333,14 +357,13 @@ static void reboot_signal(int sig)
extern int init_main(int argc, char **argv)
{
int run_rc = TRUE;
- int wait_for_enter = FALSE;
+ int wait_for_enter = TRUE;
pid_t pid1 = 0;
pid_t pid2 = 0;
struct stat statbuf;
- const char* const swap_on_cmd[] = { "/bin/swapon", "swapon", "-a", 0};
const char* const init_commands[] = { INITSCRIPT, INITSCRIPT, 0};
const char* const shell_commands[] = { SHELL, "-" SHELL, 0};
- const char* const* tty0_commands = init_commands;
+ const char* const* tty0_commands = shell_commands;
const char* const* tty1_commands = shell_commands;
#ifdef DEBUG_INIT
char *hello_msg_format =
@@ -349,9 +372,15 @@ extern int init_main(int argc, char **argv)
char *hello_msg_format =
"init started: BusyBox v%s (%s) multi-call binary\r\n";
#endif
- const char *no_memory =
- "Sorry, your computer does not have enough memory.\r\n";
+
+ /* Check if we are supposed to be in single user mode */
+ if ( argc > 1 && (!strcmp(argv[1], "single") ||
+ !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
+ run_rc = FALSE;
+ }
+
+
/* Set up sig handlers -- be sure to
* clear all of these in run() */
signal(SIGUSR1, halt_signal);
@@ -364,6 +393,7 @@ extern int init_main(int argc, char **argv)
#ifndef DEBUG_INIT
reboot(RB_DISABLE_CAD);
#endif
+
/* Figure out where the default console should be */
console_init();
@@ -375,9 +405,9 @@ extern int init_main(int argc, char **argv)
setsid();
/* Make sure PATH is set to something sane */
- if (getenv("PATH") == NULL)
- putenv(PATH_DEFAULT);
+ putenv(PATH_DEFAULT);
+
/* Hello world */
#ifndef DEBUG_INIT
message(log, hello_msg_format, BB_VER, BB_BT);
@@ -397,44 +427,17 @@ extern int init_main(int argc, char **argv)
message(console, "Mounting /proc: failed!\n");
}
- /* Make sure there is enough memory to do something useful */
- set_free_pages();
- if (mem_total() < 3500) {
- int retval;
- retval = stat("/etc/fstab", &statbuf);
- if (retval) {
- message(console, "%s", no_memory);
- while (1) {
- sleep(1);
- }
- } else {
- /* Try to turn on swap */
- waitfor(run(swap_on_cmd, log, FALSE));
- if (mem_total() < 2000) {
- message(console, "%s", no_memory);
- while (1) {
- sleep(1);
- }
- }
- }
- }
+ /* Make sure there is enough memory to do something useful. */
+ check_memory();
- /* Check if we are supposed to be in single user mode */
- if ( argc > 1 && (!strcmp(argv[1], "single") ||
- !strcmp(argv[1], "-s") || !strcmp(argv[1], "1"))) {
- run_rc = FALSE;
- wait_for_enter = TRUE;
- tty0_commands = shell_commands;
- tty1_commands = shell_commands;
- }
/* Make sure an init script exists before trying to run it */
- if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)) {
- wait_for_enter = TRUE;
- tty0_commands = shell_commands;
- tty1_commands = shell_commands;
+ if (run_rc == TRUE && stat(INITSCRIPT, &statbuf)==0) {
+ wait_for_enter = FALSE;
+ tty0_commands = init_commands;
}
+
/* Ok, now launch the rc script and/or prepare to
* start up some VTs if somebody hits enter...
*/
@@ -452,9 +455,14 @@ extern int init_main(int argc, char **argv)
if (wpid > 0 ) {
message(log, "pid %d exited, status=%x.\n", wpid, status);
}
- /* Don't respawn an init script if it exits */
- if (run_rc == FALSE && wpid == pid1) {
+ if (wpid == pid1) {
pid1 = 0;
+ if (run_rc == TRUE) {
+ /* Don't respawn init script if it exits. */
+ run_rc=FALSE;
+ wait_for_enter=TRUE;
+ tty0_commands=shell_commands;
+ }
}
if (wpid == pid2) {
pid2 = 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 17:55:10 +0000