From 4ba93280223ceb5de1bcedb196c38252f334521a Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Wed, 30 Oct 2013 18:58:59 +0100 Subject: nspawn: split out pty forwaring logic into ptyfwd.c --- src/nspawn/nspawn.c | 245 +--------------------------------------------------- 1 file changed, 2 insertions(+), 243 deletions(-) (limited to 'src/nspawn') diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c index c0f99482c0..cb2f05c02d 100644 --- a/src/nspawn/nspawn.c +++ b/src/nspawn/nspawn.c @@ -62,6 +62,7 @@ #include "build.h" #include "fileio.h" #include "bus-util.h" +#include "ptyfwd.h" #ifndef TTY_GID #define TTY_GID 5 @@ -923,248 +924,6 @@ static int drop_capabilities(void) { return capability_bounding_set_drop(~arg_retain, false); } -static int process_pty(int master, pid_t pid, sigset_t *mask) { - - char in_buffer[LINE_MAX], out_buffer[LINE_MAX]; - size_t in_buffer_full = 0, out_buffer_full = 0; - struct epoll_event stdin_ev, stdout_ev, master_ev, signal_ev; - bool stdin_readable = false, stdout_writable = false, master_readable = false, master_writable = false; - int ep = -1, signal_fd = -1, r; - bool tried_orderly_shutdown = false; - - assert(master >= 0); - assert(pid > 0); - assert(mask); - - fd_nonblock(STDIN_FILENO, 1); - fd_nonblock(STDOUT_FILENO, 1); - fd_nonblock(master, 1); - - signal_fd = signalfd(-1, mask, SFD_NONBLOCK|SFD_CLOEXEC); - if (signal_fd < 0) { - log_error("signalfd(): %m"); - r = -errno; - goto finish; - } - - ep = epoll_create1(EPOLL_CLOEXEC); - if (ep < 0) { - log_error("Failed to create epoll: %m"); - r = -errno; - goto finish; - } - - /* We read from STDIN only if this is actually a TTY, - * otherwise we assume non-interactivity. */ - if (isatty(STDIN_FILENO)) { - zero(stdin_ev); - stdin_ev.events = EPOLLIN|EPOLLET; - stdin_ev.data.fd = STDIN_FILENO; - - if (epoll_ctl(ep, EPOLL_CTL_ADD, STDIN_FILENO, &stdin_ev) < 0) { - log_error("Failed to register STDIN in epoll: %m"); - r = -errno; - goto finish; - } - } - - zero(stdout_ev); - stdout_ev.events = EPOLLOUT|EPOLLET; - stdout_ev.data.fd = STDOUT_FILENO; - - zero(master_ev); - master_ev.events = EPOLLIN|EPOLLOUT|EPOLLET; - master_ev.data.fd = master; - - zero(signal_ev); - signal_ev.events = EPOLLIN; - signal_ev.data.fd = signal_fd; - - if (epoll_ctl(ep, EPOLL_CTL_ADD, STDOUT_FILENO, &stdout_ev) < 0) { - if (errno != EPERM) { - log_error("Failed to register stdout in epoll: %m"); - r = -errno; - goto finish; - } - /* stdout without epoll support. Likely redirected to regular file. */ - stdout_writable = true; - } - - if (epoll_ctl(ep, EPOLL_CTL_ADD, master, &master_ev) < 0 || - epoll_ctl(ep, EPOLL_CTL_ADD, signal_fd, &signal_ev) < 0) { - log_error("Failed to register fds in epoll: %m"); - r = -errno; - goto finish; - } - - for (;;) { - struct epoll_event ev[16]; - ssize_t k; - int i, nfds; - - nfds = epoll_wait(ep, ev, ELEMENTSOF(ev), -1); - if (nfds < 0) { - - if (errno == EINTR || errno == EAGAIN) - continue; - - log_error("epoll_wait(): %m"); - r = -errno; - goto finish; - } - - assert(nfds >= 1); - - for (i = 0; i < nfds; i++) { - if (ev[i].data.fd == STDIN_FILENO) { - - if (ev[i].events & (EPOLLIN|EPOLLHUP)) - stdin_readable = true; - - } else if (ev[i].data.fd == STDOUT_FILENO) { - - if (ev[i].events & (EPOLLOUT|EPOLLHUP)) - stdout_writable = true; - - } else if (ev[i].data.fd == master) { - - if (ev[i].events & (EPOLLIN|EPOLLHUP)) - master_readable = true; - - if (ev[i].events & (EPOLLOUT|EPOLLHUP)) - master_writable = true; - - } else if (ev[i].data.fd == signal_fd) { - struct signalfd_siginfo sfsi; - ssize_t n; - - n = read(signal_fd, &sfsi, sizeof(sfsi)); - if (n != sizeof(sfsi)) { - - if (n >= 0) { - log_error("Failed to read from signalfd: invalid block size"); - r = -EIO; - goto finish; - } - - if (errno != EINTR && errno != EAGAIN) { - log_error("Failed to read from signalfd: %m"); - r = -errno; - goto finish; - } - } else { - - if (sfsi.ssi_signo == SIGWINCH) { - struct winsize ws; - - /* The window size changed, let's forward that. */ - if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0) - ioctl(master, TIOCSWINSZ, &ws); - } else if (sfsi.ssi_signo == SIGTERM && arg_boot && !tried_orderly_shutdown) { - - log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination."); - - /* This only works for systemd... */ - tried_orderly_shutdown = true; - kill(pid, SIGRTMIN+3); - - } else { - r = 0; - goto finish; - } - } - } - } - - while ((stdin_readable && in_buffer_full <= 0) || - (master_writable && in_buffer_full > 0) || - (master_readable && out_buffer_full <= 0) || - (stdout_writable && out_buffer_full > 0)) { - - if (stdin_readable && in_buffer_full < LINE_MAX) { - - k = read(STDIN_FILENO, in_buffer + in_buffer_full, LINE_MAX - in_buffer_full); - if (k < 0) { - - if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO) - stdin_readable = false; - else { - log_error("read(): %m"); - r = -errno; - goto finish; - } - } else - in_buffer_full += (size_t) k; - } - - if (master_writable && in_buffer_full > 0) { - - k = write(master, in_buffer, in_buffer_full); - if (k < 0) { - - if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO) - master_writable = false; - else { - log_error("write(): %m"); - r = -errno; - goto finish; - } - - } else { - assert(in_buffer_full >= (size_t) k); - memmove(in_buffer, in_buffer + k, in_buffer_full - k); - in_buffer_full -= k; - } - } - - if (master_readable && out_buffer_full < LINE_MAX) { - - k = read(master, out_buffer + out_buffer_full, LINE_MAX - out_buffer_full); - if (k < 0) { - - if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO) - master_readable = false; - else { - log_error("read(): %m"); - r = -errno; - goto finish; - } - } else - out_buffer_full += (size_t) k; - } - - if (stdout_writable && out_buffer_full > 0) { - - k = write(STDOUT_FILENO, out_buffer, out_buffer_full); - if (k < 0) { - - if (errno == EAGAIN || errno == EPIPE || errno == ECONNRESET || errno == EIO) - stdout_writable = false; - else { - log_error("write(): %m"); - r = -errno; - goto finish; - } - - } else { - assert(out_buffer_full >= (size_t) k); - memmove(out_buffer, out_buffer + k, out_buffer_full - k); - out_buffer_full -= k; - } - } - } - } - -finish: - if (ep >= 0) - close_nointr_nofail(ep); - - if (signal_fd >= 0) - close_nointr_nofail(signal_fd); - - return r; -} - static int register_machine(void) { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; _cleanup_bus_unref_ sd_bus *bus = NULL; @@ -1669,7 +1428,7 @@ int main(int argc, char *argv[]) { fdset_free(fds); fds = NULL; - if (process_pty(master, pid, &mask) < 0) + if (process_pty(master, &mask, arg_boot ? pid : 0, SIGRTMIN+3) < 0) goto finish; if (saved_attr_valid) -- cgit v1.2.3-54-g00ecf