diff options
Diffstat (limited to 'src/handler.cc')
| -rw-r--r-- | src/handler.cc | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/src/handler.cc b/src/handler.cc deleted file mode 100644 index 7dc96a8..0000000 --- a/src/handler.cc +++ /dev/null @@ -1,214 +0,0 @@ -#include "handler.h" - -#include <termios.h> -#include <sys/ioctl.h> - -namespace ov4 -{ - -sigset_t - block_sig_TTOU, - block_job, - block_io; - -void signal_init() -{ - /* Install the signal handlers */ - - sigemptyset(&block_job); - sigemptyset(&block_sig_TTOU); - sigemptyset(&block_io); - - sigaddset(&block_job, SIGINT); - sigaddset(&block_job, SIGTSTP); - sigaddset(&block_job, SIGCHLD); - - sigaddset(&block_sig_TTOU, SIGTTOU); - - sigaddset(&block_io, SIGTTOU); - sigaddset(&block_io, SIGTTIN); - - Signal(SIGINT, sigint_handler); /* ctrl-c */ - Signal(SIGTSTP, sigtstp_handler); /* ctrl-z */ - Signal(SIGCHLD, sigchld_handler); /* Terminated or stopped child */ -} - -/* - * Signal - wrapper for the sigaction function - */ - -handler_t *Signal([[maybe_unused]] int signum, handler_t *handler) -{ - struct sigaction action, old_action; - - action.sa_handler = handler; - sigemptyset(&action.sa_mask); /* block sigs of type being handled */ - action.sa_flags = SA_RESTART; /* restart syscalls if possible */ - - if (sigaction(signum, &action, &old_action) < 0) - unix_error("Signal error"); - return (old_action.sa_handler); -} - -/* - * sigchld_handler - The kernel sends a SIGCHLD to the shell whenever - * a child job terminates (becomes a zombie), or stops because it - * received a SIGSTOP or SIGTSTP signal. The handler reaps all - * available zombie children, but doesn't wait for any other - * currently running children to terminate. - */ -void sigchld_handler([[maybe_unused]] int sig) -{ - int errno_backup = errno; - - sigset_t prev; - block_handler(&prev); - - int status, pid; - safe_debug("SIGCHLD\n"); - - while ((pid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) - { - // signal'd or stopped or normally quit - // print terminated/stopped message - if (WIFSIGNALED(status) || WIFSTOPPED(status)) - { - int jid = pid2jid(pid); - safe_output("Job [", jid, "] (", pid, ") "); - if (!WIFSTOPPED(status) && WTERMSIG(status) == SIGINT) - safe_print("terminated"); - else if (WIFSTOPPED(status)) - safe_print("stopped"); - else - safe_print("idk"); - safe_print(" by signal "); - if (WIFSTOPPED(status)) - safe_print(WSTOPSIG(status)); - else - safe_print(WTERMSIG(status)); - safe_print("\n"); - } - - // handle job table - // and save exit/signal code - - // stopped - if (WIFSTOPPED(status)) - { - safe_output("Process suspended PID: ", pid, "\n"); - sigset_t prev_inner; - block_all(&prev_inner); - job_suspend(pid); - sigprocmask(SIG_SETMASK, &prev_inner, nullptr); - } - // other type of signal'd - // or normally quit - else { - safe_output("Process terminated PID: ", pid, "\n"); - sigset_t prev_inner; - block_all(&prev_inner); - deletejob(pid); - sigprocmask(SIG_SETMASK, &prev_inner, nullptr); - - // terminated normally - // so that exit code should be available - if (WIFEXITED(status)) - { - safe_output("Exit code: ", WEXITSTATUS(status), "\n"); - if (pid == exit_required_pid) - { - exit_code = WEXITSTATUS(status); - safe_logger("sigchld_handler: required PID detected: ", pid, "\n"); - } - } - // if signal'd - else if (WIFSIGNALED(status)) - { - safe_output("Signal code: ", WTERMSIG(status), "\n"); - if (pid == exit_required_pid) - { - exit_code = SIGNAL_EXIT_CODE_BASE + WTERMSIG(status); - safe_logger("sigchld_handler: required PID detected: ", pid, "\n"); - } - } - - } - } - - sigprocmask(SIG_SETMASK, &prev, nullptr); - - errno = errno_backup; - return; -} - -/* - * sigint_handler - The kernel sends a SIGINT to the shell whenver the - * user types ctrl-c at the keyboard. Catch it and send it along - * to the foreground job. - */ -void sigint_handler([[maybe_unused]] int sig) -{ - int errno_backup = errno; - - sigset_t prev; - block_handler(&prev); - - int pid = fgpid(); - if (pid != 0) - { - kill(-pid, SIGINT); - } else { - tcflush(STDIN_FILENO, TCIFLUSH); - ioctl(STDIN_FILENO, TIOCSTI, "\n"); - } - - sigprocmask(SIG_SETMASK, &prev, nullptr); - - errno = errno_backup; - return; -} - -/* - * sigtstp_handler - The kernel sends a SIGTSTP to the shell whenever - * the user types ctrl-z at the keyboard. Catch it and suspend the - * foreground job by sending it a SIGTSTP. - */ -void sigtstp_handler([[maybe_unused]] int sig) -{ - int errno_backup = errno; - - sigset_t prev; - block_handler(&prev); - - int pid = fgpid(); - if (pid != 0) - { - kill(-pid, SIGTSTP); - } - - sigprocmask(SIG_SETMASK, &prev, nullptr); - - errno = errno_backup; - return; -} - -int block_all(sigset_t *prev) -{ - sigset_t set; - sigfillset(&set); - return sigprocmask(SIG_SETMASK, &set, prev); -} - -int block_handler(sigset_t *prev) -{ - return sigprocmask(SIG_BLOCK, &block_job, prev); -} - -void sigquit_handler([[maybe_unused]] int sig) -{ - //printf("Terminating after receipt of SIGQUIT signal\n"); - safe_output("Terminating after receipt of SIGQUIT signal\n"); - exit(1); -} - -} |