init: de-indent a block of code
This commit is contained in:
Denis Vlasenko
parent
b716754199
commit
966bb43766
282
init/init.c
282
init/init.c
@ -316,7 +316,7 @@ static void open_stdio_to_tty(const char* tty_name, int fail)
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close(0);
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if ((device_open(tty_name, O_RDWR)) < 0) {
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dup2(1, 0); /* restore fd #0 - avoid nasty surprises */
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message(L_LOG | L_CONSOLE, "can't open %s: %s",
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message(L_LOG | L_CONSOLE, "Can't open %s: %s",
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tty_name, strerror(errno));
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if (fail)
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_exit(1);
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@ -342,178 +342,174 @@ static pid_t run(const struct init_action *a)
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char *cmd[INIT_BUFFS_SIZE];
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char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
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sigset_t nmask, omask;
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static const char press_enter[] =
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#ifdef CUSTOMIZED_BANNER
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#include CUSTOMIZED_BANNER
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#endif
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"\nPlease press Enter to activate this console. ";
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/* Block sigchild while forking. */
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sigemptyset(&nmask);
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sigaddset(&nmask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &nmask, &omask);
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pid = fork();
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sigprocmask(SIG_SETMASK, &omask, NULL);
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if ((pid = fork()) == 0) {
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/* Clean up */
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sigprocmask(SIG_SETMASK, &omask, NULL);
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if (pid)
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return pid;
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/* Reset signal handlers that were set by the parent process */
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signal(SIGUSR1, SIG_DFL);
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signal(SIGUSR2, SIG_DFL);
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signal(SIGINT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGCONT, SIG_DFL);
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signal(SIGSTOP, SIG_DFL);
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signal(SIGTSTP, SIG_DFL);
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/* Reset signal handlers that were set by the parent process */
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signal(SIGUSR1, SIG_DFL);
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signal(SIGUSR2, SIG_DFL);
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signal(SIGINT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGCONT, SIG_DFL);
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signal(SIGSTOP, SIG_DFL);
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signal(SIGTSTP, SIG_DFL);
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/* Create a new session and make ourself the process
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* group leader */
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setsid();
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/* Create a new session and make ourself the process
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* group leader */
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setsid();
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/* Open the new terminal device */
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open_stdio_to_tty(a->terminal, 1);
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/* Open the new terminal device */
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open_stdio_to_tty(a->terminal, 1);
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/* If the init Action requires us to wait, then force the
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* supplied terminal to be the controlling tty. */
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if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
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/* If the init Action requires us to wait, then force the
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* supplied terminal to be the controlling tty. */
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if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
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/* Now fork off another process to just hang around */
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/* Now fork off another process to just hang around */
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if ((pid = fork()) < 0) {
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message(L_LOG | L_CONSOLE, "Can't fork");
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_exit(1);
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}
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if (pid > 0) {
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/* We are the parent -- wait till the child is done */
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signal(SIGINT, SIG_IGN);
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signal(SIGTSTP, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGCHLD, SIG_DFL);
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waitfor(NULL, pid);
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/* See if stealing the controlling tty back is necessary */
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if (tcgetpgrp(0) != getpid())
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_exit(0);
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/* Use a temporary process to steal the controlling tty. */
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if ((pid = fork()) < 0) {
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message(L_LOG | L_CONSOLE, "can't fork");
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message(L_LOG | L_CONSOLE, "Can't fork");
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_exit(1);
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}
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if (pid > 0) {
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/* We are the parent -- wait till the child is done */
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signal(SIGINT, SIG_IGN);
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signal(SIGTSTP, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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signal(SIGCHLD, SIG_DFL);
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waitfor(NULL, pid);
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/* See if stealing the controlling tty back is necessary */
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if (tcgetpgrp(0) != getpid())
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_exit(0);
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/* Use a temporary process to steal the controlling tty. */
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if ((pid = fork()) < 0) {
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message(L_LOG | L_CONSOLE, "can't fork");
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_exit(1);
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}
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if (pid == 0) {
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setsid();
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ioctl(0, TIOCSCTTY, 1);
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_exit(0);
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}
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waitfor(NULL, pid);
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if (pid == 0) {
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setsid();
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ioctl(0, TIOCSCTTY, 1);
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_exit(0);
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}
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/* Now fall though to actually execute things */
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waitfor(NULL, pid);
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_exit(0);
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}
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/* See if any special /bin/sh requiring characters are present */
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if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
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cmd[0] = (char *)DEFAULT_SHELL;
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cmd[1] = (char*)"-c";
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cmd[2] = strcat(strcpy(buf, "exec "), a->command);
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cmd[3] = NULL;
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/* Now fall though to actually execute things */
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}
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/* See if any special /bin/sh requiring characters are present */
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if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
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cmd[0] = (char*)DEFAULT_SHELL;
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cmd[1] = (char*)"-c";
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cmd[2] = strcat(strcpy(buf, "exec "), a->command);
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cmd[3] = NULL;
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} else {
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/* Convert command (char*) into cmd (char**, one word per string) */
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strcpy(buf, a->command);
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s = buf;
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for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
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if (*tmpCmd != '\0') {
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cmd[i] = tmpCmd;
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i++;
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}
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}
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cmd[i] = NULL;
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}
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cmdpath = cmd[0];
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/*
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* Interactive shells want to see a dash in argv[0]. This
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* typically is handled by login, argv will be setup this
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* way if a dash appears at the front of the command path
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* (like "-/bin/sh").
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*/
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if (*cmdpath == '-') {
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/* skip over the dash */
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++cmdpath;
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/* find the last component in the command pathname */
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s = bb_get_last_path_component(cmdpath);
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/* make a new argv[0] */
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if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
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message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
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cmd[0] = cmdpath;
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} else {
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/* Convert command (char*) into cmd (char**, one word per string) */
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strcpy(buf, a->command);
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s = buf;
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for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
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if (*tmpCmd != '\0') {
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cmd[i] = tmpCmd;
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i++;
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}
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}
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cmd[i] = NULL;
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cmd[0][0] = '-';
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strcpy(cmd[0] + 1, s);
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}
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cmdpath = cmd[0];
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/*
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* Interactive shells want to see a dash in argv[0]. This
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* typically is handled by login, argv will be setup this
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* way if a dash appears at the front of the command path
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* (like "-/bin/sh").
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*/
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if (*cmdpath == '-') {
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/* skip over the dash */
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++cmdpath;
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/* find the last component in the command pathname */
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s = bb_get_last_path_component(cmdpath);
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/* make a new argv[0] */
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if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
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message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
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cmd[0] = cmdpath;
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} else {
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cmd[0][0] = '-';
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strcpy(cmd[0] + 1, s);
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}
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#if ENABLE_FEATURE_INIT_SCTTY
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/* Establish this process as session leader and
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* (attempt) to make the tty (if any) a controlling tty.
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*/
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setsid();
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ioctl(0, TIOCSCTTY, 0 /*don't steal it*/);
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/* Establish this process as session leader and
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* (attempt) to make the tty (if any) a controlling tty.
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*/
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setsid();
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ioctl(0, TIOCSCTTY, 0 /*don't steal it*/);
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#endif
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}
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}
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#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
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if (a->action & ASKFIRST) {
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char c;
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/*
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* Save memory by not exec-ing anything large (like a shell)
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* before the user wants it. This is critical if swap is not
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* enabled and the system has low memory. Generally this will
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* be run on the second virtual console, and the first will
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* be allowed to start a shell or whatever an init script
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* specifies.
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*/
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messageD(L_LOG, "Waiting for enter to start '%s'"
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"(pid %d, tty '%s')\n",
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cmdpath, getpid(), a->terminal);
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full_write(1, press_enter, sizeof(press_enter) - 1);
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while (read(0, &c, 1) == 1 && c != '\n')
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;
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}
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if (a->action & ASKFIRST) {
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static const char press_enter[] =
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#ifdef CUSTOMIZED_BANNER
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#include CUSTOMIZED_BANNER
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#endif
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/* Log the process name and args */
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message(L_LOG, "starting pid %d, tty '%s': '%s'",
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getpid(), a->terminal, cmdpath);
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"\nPlease press Enter to activate this console. ";
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char c;
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/*
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* Save memory by not exec-ing anything large (like a shell)
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* before the user wants it. This is critical if swap is not
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* enabled and the system has low memory. Generally this will
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* be run on the second virtual console, and the first will
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* be allowed to start a shell or whatever an init script
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* specifies.
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*/
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messageD(L_LOG, "waiting for enter to start '%s'"
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"(pid %d, tty '%s')\n",
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cmdpath, getpid(), a->terminal);
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full_write(1, press_enter, sizeof(press_enter) - 1);
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while (read(0, &c, 1) == 1 && c != '\n')
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;
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}
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#endif
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/* Log the process name and args */
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message(L_LOG, "starting pid %d, tty '%s': '%s'",
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getpid(), a->terminal, cmdpath);
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#if ENABLE_FEATURE_INIT_COREDUMPS
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{
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struct stat sb;
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if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
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struct rlimit limit;
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{
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struct stat sb;
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if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
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struct rlimit limit;
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limit.rlim_cur = RLIM_INFINITY;
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limit.rlim_max = RLIM_INFINITY;
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setrlimit(RLIMIT_CORE, &limit);
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}
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limit.rlim_cur = RLIM_INFINITY;
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limit.rlim_max = RLIM_INFINITY;
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setrlimit(RLIMIT_CORE, &limit);
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}
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#endif
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/* Now run it. The new program will take over this PID,
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* so nothing further in init.c should be run. */
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BB_EXECVP(cmdpath, cmd);
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/* We're still here? Some error happened. */
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message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
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cmdpath, strerror(errno));
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_exit(-1);
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}
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sigprocmask(SIG_SETMASK, &omask, NULL);
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return pid;
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#endif
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/* Now run it. The new program will take over this PID,
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* so nothing further in init.c should be run. */
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BB_EXECVP(cmdpath, cmd);
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/* We're still here? Some error happened. */
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message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
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cmdpath, strerror(errno));
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_exit(-1);
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}
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static int waitfor(const struct init_action *a, pid_t pid)
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