587 lines
14 KiB
C
587 lines
14 KiB
C
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/*
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* This is pseudo-terminal container for child process where parent creates a
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* proxy between the current std{in,out,etrr} and the child's pty. Advantages:
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*
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* - child has no access to parent's terminal (e.g. su --pty)
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* - parent can log all traffic between user and child's terminall (e.g. script(1))
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* - it's possible to start commands on terminal although parent has no terminal
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*
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* This code is in the public domain; do with it what you wish.
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*
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* Written by Karel Zak <kzak@redhat.com> in Jul 2019
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <pty.h>
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#include <poll.h>
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#include <sys/signalfd.h>
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#include <paths.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "c.h"
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#include "all-io.h"
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#include "ttyutils.h"
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#include "pty-session.h"
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#include "debug.h"
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static UL_DEBUG_DEFINE_MASK(ulpty);
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UL_DEBUG_DEFINE_MASKNAMES(ulpty) = UL_DEBUG_EMPTY_MASKNAMES;
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#define ULPTY_DEBUG_INIT (1 << 1)
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#define ULPTY_DEBUG_SETUP (1 << 2)
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#define ULPTY_DEBUG_SIG (1 << 3)
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#define ULPTY_DEBUG_IO (1 << 4)
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#define ULPTY_DEBUG_DONE (1 << 5)
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#define ULPTY_DEBUG_ALL 0xFFFF
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#define DBG(m, x) __UL_DBG(ulpty, ULPTY_DEBUG_, m, x)
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#define ON_DBG(m, x) __UL_DBG_CALL(ulpty, ULPTY_DEBUG_, m, x)
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#define UL_DEBUG_CURRENT_MASK UL_DEBUG_MASK(ulpty)
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#include "debugobj.h"
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void ul_pty_init_debug(int mask)
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{
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if (ulpty_debug_mask)
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return;
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__UL_INIT_DEBUG_FROM_ENV(ulpty, ULPTY_DEBUG_, mask, ULPTY_DEBUG);
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}
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struct ul_pty *ul_new_pty(int is_stdin_tty)
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{
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struct ul_pty *pty = calloc(1, sizeof(*pty));
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if (!pty)
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return NULL;
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DBG(SETUP, ul_debugobj(pty, "alloc handler"));
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pty->isterm = is_stdin_tty;
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pty->master = -1;
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pty->slave = -1;
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pty->sigfd = -1;
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pty->child = (pid_t) -1;
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return pty;
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}
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sigset_t *ul_pty_get_orig_sigset(struct ul_pty *pty)
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{
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assert(pty);
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return &pty->orgsig;
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}
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int ul_pty_get_delivered_signal(struct ul_pty *pty)
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{
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assert(pty);
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return pty->delivered_signal;
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}
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struct ul_pty_callbacks *ul_pty_get_callbacks(struct ul_pty *pty)
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{
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assert(pty);
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return &pty->callbacks;
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}
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void ul_pty_set_callback_data(struct ul_pty *pty, void *data)
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{
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assert(pty);
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pty->callback_data = data;
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}
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void ul_pty_set_child(struct ul_pty *pty, pid_t child)
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{
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assert(pty);
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pty->child = child;
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}
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/* it's active when signals are redurected to sigfd */
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int ul_pty_is_running(struct ul_pty *pty)
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{
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assert(pty);
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return pty->sigfd >= 0;
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}
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/* call me before fork() */
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int ul_pty_setup(struct ul_pty *pty)
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{
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struct termios slave_attrs;
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int rc;
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if (pty->isterm) {
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DBG(SETUP, ul_debugobj(pty, "create for terminal"));
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/* original setting of the current terminal */
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if (tcgetattr(STDIN_FILENO, &pty->stdin_attrs) != 0)
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return -errno;
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ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&pty->win);
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/* create master+slave */
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rc = openpty(&pty->master, &pty->slave, NULL, &pty->stdin_attrs, &pty->win);
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/* set the current terminal to raw mode; pty_cleanup() reverses this change on exit */
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slave_attrs = pty->stdin_attrs;
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cfmakeraw(&slave_attrs);
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slave_attrs.c_lflag &= ~ECHO;
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tcsetattr(STDIN_FILENO, TCSANOW, &slave_attrs);
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} else {
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DBG(SETUP, ul_debugobj(pty, "create for non-terminal"));
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rc = openpty(&pty->master, &pty->slave, NULL, NULL, NULL);
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if (!rc) {
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tcgetattr(pty->slave, &slave_attrs);
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slave_attrs.c_lflag &= ~ECHO;
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tcsetattr(pty->slave, TCSANOW, &slave_attrs);
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}
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}
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DBG(SETUP, ul_debugobj(pty, "pty setup done [master=%d, slave=%d, rc=%d]",
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pty->master, pty->slave, rc));
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return rc;
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}
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/* cleanup in parent process */
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void ul_pty_cleanup(struct ul_pty *pty)
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{
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struct termios rtt;
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if (pty->master == -1 || !pty->isterm)
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return;
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DBG(DONE, ul_debugobj(pty, "cleanup"));
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rtt = pty->stdin_attrs;
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tcsetattr(STDIN_FILENO, TCSADRAIN, &rtt);
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}
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/* call me in child process */
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void ul_pty_init_slave(struct ul_pty *pty)
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{
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DBG(SETUP, ul_debugobj(pty, "initialize slave"));
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setsid();
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ioctl(pty->slave, TIOCSCTTY, 1);
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close(pty->master);
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dup2(pty->slave, STDIN_FILENO);
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dup2(pty->slave, STDOUT_FILENO);
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dup2(pty->slave, STDERR_FILENO);
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close(pty->slave);
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if (pty->sigfd >= 0)
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close(pty->sigfd);
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pty->slave = -1;
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pty->master = -1;
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pty->sigfd = -1;
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sigprocmask(SIG_SETMASK, &pty->orgsig, NULL);
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DBG(SETUP, ul_debugobj(pty, "... initialize slave done"));
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}
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static int write_output(char *obuf, ssize_t bytes)
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{
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DBG(IO, ul_debug(" writing output"));
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if (write_all(STDOUT_FILENO, obuf, bytes)) {
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DBG(IO, ul_debug(" writing output *failed*"));
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return -errno;
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}
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return 0;
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}
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static int write_to_child(struct ul_pty *pty,
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char *buf, size_t bufsz)
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{
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return write_all(pty->master, buf, bufsz);
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}
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/*
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* The pty is usually faster than shell, so it's a good idea to wait until
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* the previous message has been already read by shell from slave before we
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* write to master. This is necessary especially for EOF situation when we can
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* send EOF to master before shell is fully initialized, to workaround this
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* problem we wait until slave is empty. For example:
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*
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* echo "date" | su --pty
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*
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* Unfortunately, the child (usually shell) can ignore stdin at all, so we
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* don't wait forever to avoid dead locks...
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*
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* Note that su --pty is primarily designed for interactive sessions as it
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* maintains master+slave tty stuff within the session. Use pipe to write to
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* pty and assume non-interactive (tee-like) behavior is NOT well supported.
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*/
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static void write_eof_to_child(struct ul_pty *pty)
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{
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unsigned int tries = 0;
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struct pollfd fds[] = {
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{ .fd = pty->slave, .events = POLLIN }
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};
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char c = DEF_EOF;
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DBG(IO, ul_debugobj(pty, " waiting for empty slave"));
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while (poll(fds, 1, 10) == 1 && tries < 8) {
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DBG(IO, ul_debugobj(pty, " slave is not empty"));
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xusleep(250000);
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tries++;
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}
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if (tries < 8)
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DBG(IO, ul_debugobj(pty, " slave is empty now"));
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DBG(IO, ul_debugobj(pty, " sending EOF to master"));
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write_to_child(pty, &c, sizeof(char));
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}
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static int handle_io(struct ul_pty *pty, int fd, int *eof)
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{
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char buf[BUFSIZ];
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ssize_t bytes;
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DBG(IO, ul_debugobj(pty, "%d FD active", fd));
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*eof = 0;
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/* read from active FD */
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bytes = read(fd, buf, sizeof(buf));
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if (bytes < 0) {
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if (errno == EAGAIN || errno == EINTR)
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return 0;
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return -errno;
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}
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if (bytes == 0) {
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*eof = 1;
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return 0;
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}
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/* from stdin (user) to command */
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if (fd == STDIN_FILENO) {
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DBG(IO, ul_debugobj(pty, " stdin --> master %zd bytes", bytes));
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if (write_to_child(pty, buf, bytes))
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return -errno;
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/* without sync write_output() will write both input &
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* shell output that looks like double echoing */
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fdatasync(pty->master);
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/* from command (master) to stdout */
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} else if (fd == pty->master) {
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DBG(IO, ul_debugobj(pty, " master --> stdout %zd bytes", bytes));
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write_output(buf, bytes);
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}
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return 0;
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}
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static int handle_signal(struct ul_pty *pty, int fd)
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{
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struct signalfd_siginfo info;
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ssize_t bytes;
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DBG(SIG, ul_debugobj(pty, "signal FD %d active", fd));
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bytes = read(fd, &info, sizeof(info));
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if (bytes != sizeof(info)) {
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if (bytes < 0 && (errno == EAGAIN || errno == EINTR))
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return 0;
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return -errno;
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}
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switch (info.ssi_signo) {
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case SIGCHLD:
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DBG(SIG, ul_debugobj(pty, " get signal SIGCHLD"));
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if (info.ssi_code == CLD_EXITED
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|| info.ssi_code == CLD_KILLED
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|| info.ssi_code == CLD_DUMPED)
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pty->callbacks.child_wait(pty->callback_data);
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else if (info.ssi_status == SIGSTOP && pty->child > 0)
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pty->callbacks.child_sigstop(pty->callback_data);
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if (pty->child <= 0)
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pty->poll_timeout = 10;
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return 0;
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case SIGWINCH:
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DBG(SIG, ul_debugobj(pty, " get signal SIGWINCH"));
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if (pty->isterm) {
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ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&pty->win);
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ioctl(pty->slave, TIOCSWINSZ, (char *)&pty->win);
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}
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break;
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case SIGTERM:
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/* fallthrough */
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case SIGINT:
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/* fallthrough */
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case SIGQUIT:
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DBG(SIG, ul_debugobj(pty, " get signal SIG{TERM,INT,QUIT}"));
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pty->delivered_signal = info.ssi_signo;
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/* Child termination is going to generate SIGCHILD (see above) */
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if (pty->child > 0)
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kill(pty->child, SIGTERM);
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break;
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default:
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abort();
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}
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return 0;
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}
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/* loop in parent */
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int ul_pty_proxy_master(struct ul_pty *pty)
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{
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sigset_t ourset;
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int rc = 0, ret, eof = 0;
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enum {
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POLLFD_SIGNAL = 0,
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POLLFD_MASTER,
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POLLFD_STDIN
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};
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struct pollfd pfd[] = {
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[POLLFD_SIGNAL] = { .fd = -1, .events = POLLIN | POLLERR | POLLHUP },
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[POLLFD_MASTER] = { .fd = pty->master, .events = POLLIN | POLLERR | POLLHUP },
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[POLLFD_STDIN] = { .fd = STDIN_FILENO, .events = POLLIN | POLLERR | POLLHUP }
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};
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/* We use signalfd and standard signals by handlers are blocked
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* at all
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*/
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sigfillset(&ourset);
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if (sigprocmask(SIG_BLOCK, &ourset, NULL))
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return -errno;
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sigemptyset(&ourset);
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sigaddset(&ourset, SIGCHLD);
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sigaddset(&ourset, SIGWINCH);
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sigaddset(&ourset, SIGALRM);
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sigaddset(&ourset, SIGTERM);
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sigaddset(&ourset, SIGINT);
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sigaddset(&ourset, SIGQUIT);
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if ((pty->sigfd = signalfd(-1, &ourset, SFD_CLOEXEC)) < 0) {
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rc = -errno;
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goto done;
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}
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pfd[POLLFD_SIGNAL].fd = pty->sigfd;
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pty->poll_timeout = -1;
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while (!pty->delivered_signal) {
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size_t i;
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int errsv;
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DBG(IO, ul_debugobj(pty, "calling poll()"));
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/* wait for input or signal */
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ret = poll(pfd, ARRAY_SIZE(pfd), pty->poll_timeout);
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errsv = errno;
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DBG(IO, ul_debugobj(pty, "poll() rc=%d", ret));
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if (ret < 0) {
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if (errsv == EAGAIN)
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continue;
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rc = -errno;
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break;
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}
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if (ret == 0) {
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DBG(IO, ul_debugobj(pty, "leaving poll() loop [timeout=%d]", pty->poll_timeout));
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rc = 0;
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break;
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}
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for (i = 0; i < ARRAY_SIZE(pfd); i++) {
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rc = 0;
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if (pfd[i].revents == 0)
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continue;
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DBG(IO, ul_debugobj(pty, " active pfd[%s].fd=%d %s %s %s",
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i == POLLFD_STDIN ? "stdin" :
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i == POLLFD_MASTER ? "master" :
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i == POLLFD_SIGNAL ? "signal" : "???",
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pfd[i].fd,
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pfd[i].revents & POLLIN ? "POLLIN" : "",
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pfd[i].revents & POLLHUP ? "POLLHUP" : "",
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pfd[i].revents & POLLERR ? "POLLERR" : ""));
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switch (i) {
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case POLLFD_STDIN:
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case POLLFD_MASTER:
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/* data */
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if (pfd[i].revents & POLLIN)
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rc = handle_io(pty, pfd[i].fd, &eof);
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/* EOF maybe detected by two ways:
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* A) poll() return POLLHUP event after close()
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* B) read() returns 0 (no data) */
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if ((pfd[i].revents & POLLHUP) || eof) {
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DBG(IO, ul_debugobj(pty, " ignore FD"));
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pfd[i].fd = -1;
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if (i == POLLFD_STDIN) {
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write_eof_to_child(pty);
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DBG(IO, ul_debugobj(pty, " ignore STDIN"));
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}
|
||
|
}
|
||
|
continue;
|
||
|
case POLLFD_SIGNAL:
|
||
|
rc = handle_signal(pty, pfd[i].fd);
|
||
|
break;
|
||
|
}
|
||
|
if (rc)
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
done:
|
||
|
if (pty->sigfd != -1)
|
||
|
close(pty->sigfd);
|
||
|
pty->sigfd = -1;
|
||
|
|
||
|
/* restore original setting */
|
||
|
sigprocmask(SIG_SETMASK, &pty->orgsig, NULL);
|
||
|
|
||
|
DBG(IO, ul_debug("poll() done [signal=%d, rc=%d]", pty->delivered_signal, rc));
|
||
|
return rc;
|
||
|
}
|
||
|
|
||
|
#ifdef TEST_PROGRAM_PTY
|
||
|
/*
|
||
|
* $ make test_pty
|
||
|
* $ ./test_pty
|
||
|
*
|
||
|
* ... and see for example tty(1) or "ps afu"
|
||
|
*/
|
||
|
struct ptytest {
|
||
|
pid_t child;
|
||
|
int childstatus;
|
||
|
|
||
|
struct ul_pty *pty;
|
||
|
};
|
||
|
|
||
|
/* on child exit/dump/... */
|
||
|
static void wait_for_child(void *data)
|
||
|
{
|
||
|
struct ptytest *ss = (struct ptytest *) data;
|
||
|
int status;
|
||
|
pid_t pid;
|
||
|
int options = 0;
|
||
|
|
||
|
if (ss->child == (pid_t) -1)
|
||
|
return;
|
||
|
|
||
|
if (ul_pty_is_running(ss->pty)) {
|
||
|
/* wait for specific child */
|
||
|
options = WNOHANG;
|
||
|
for (;;) {
|
||
|
pid = waitpid(ss->child, &status, options);
|
||
|
if (pid != (pid_t) - 1) {
|
||
|
ss->childstatus = status;
|
||
|
ss->child = (pid_t) -1;
|
||
|
ul_pty_set_child(ss->pty, (pid_t) -1);
|
||
|
} else
|
||
|
break;
|
||
|
}
|
||
|
} else {
|
||
|
/* final wait */
|
||
|
while ((pid = wait3(&status, options, NULL)) > 0) {
|
||
|
if (pid == ss->child) {
|
||
|
ss->childstatus = status;
|
||
|
ss->child = (pid_t) -1;
|
||
|
ul_pty_set_child(ss->pty, (pid_t) -1);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void child_sigstop(void *data)
|
||
|
{
|
||
|
struct ptytest *ss = (struct ptytest *) data;
|
||
|
kill(getpid(), SIGSTOP);
|
||
|
kill(ss->child, SIGCONT);
|
||
|
}
|
||
|
|
||
|
int main(int argc, char *argv[])
|
||
|
{
|
||
|
struct ptytest ss = { .child = (pid_t) -1 };
|
||
|
struct ul_pty_callbacks *cb;
|
||
|
const char *shell, *command = NULL, *shname = NULL;
|
||
|
int caught_signal = 0;
|
||
|
|
||
|
shell = getenv("SHELL");
|
||
|
if (shell == NULL)
|
||
|
shell = _PATH_BSHELL;
|
||
|
if (argc == 2)
|
||
|
command = argv[1];
|
||
|
|
||
|
ul_pty_init_debug(0);
|
||
|
|
||
|
ss.pty = ul_new_pty(isatty(STDIN_FILENO));
|
||
|
if (!ss.pty)
|
||
|
err(EXIT_FAILURE, "failed to allocate PTY handler");
|
||
|
|
||
|
ul_pty_set_callback_data(ss.pty, (void *) &ss);
|
||
|
cb = ul_pty_get_callbacks(ss.pty);
|
||
|
cb->child_wait = wait_for_child;
|
||
|
cb->child_sigstop = child_sigstop;
|
||
|
|
||
|
sigprocmask(SIG_BLOCK, NULL, ul_pty_get_orig_sigset(ss.pty));
|
||
|
|
||
|
if (ul_pty_setup(ss.pty))
|
||
|
err(EXIT_FAILURE, "failed to create pseudo-terminal");
|
||
|
|
||
|
fflush(stdout); /* ??? */
|
||
|
|
||
|
switch ((int) (ss.child = fork())) {
|
||
|
case -1: /* error */
|
||
|
ul_pty_cleanup(ss.pty);
|
||
|
err(EXIT_FAILURE, "cannot create child process");
|
||
|
break;
|
||
|
|
||
|
case 0: /* child */
|
||
|
ul_pty_init_slave(ss.pty);
|
||
|
|
||
|
signal(SIGTERM, SIG_DFL); /* because /etc/csh.login */
|
||
|
|
||
|
shname = strrchr(shell, '/');
|
||
|
shname = shname ? shname + 1 : shell;
|
||
|
|
||
|
if (command)
|
||
|
execl(shell, shname, "-c", command, NULL);
|
||
|
else
|
||
|
execl(shell, shname, "-i", NULL);
|
||
|
err(EXIT_FAILURE, "failed to execute %s", shell);
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* parent */
|
||
|
ul_pty_set_child(ss.pty, ss.child);
|
||
|
|
||
|
/* this is the main loop */
|
||
|
ul_pty_proxy_master(ss.pty);
|
||
|
|
||
|
/* all done; cleanup and kill */
|
||
|
caught_signal = ul_pty_get_delivered_signal(ss.pty);
|
||
|
|
||
|
if (!caught_signal && ss.child != (pid_t)-1)
|
||
|
wait_for_child(&ss); /* final wait */
|
||
|
|
||
|
if (caught_signal && ss.child != (pid_t)-1) {
|
||
|
fprintf(stderr, "\nSession terminated, killing shell...");
|
||
|
kill(ss.child, SIGTERM);
|
||
|
sleep(2);
|
||
|
kill(ss.child, SIGKILL);
|
||
|
fprintf(stderr, " ...killed.\n");
|
||
|
}
|
||
|
|
||
|
ul_pty_cleanup(ss.pty);
|
||
|
return EXIT_SUCCESS;
|
||
|
}
|
||
|
|
||
|
#endif /* TEST_PROGRAM */
|
||
|
|