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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2024 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include "log.h"
#include "hostcmd_unix.h"
#include "hostcmd_internal.h"
static int *
getPipeDescriptor (HostCommandStream *hcs, unsigned int index) {
return &hcs->package.pipe[index];
}
static int *
getInputDescriptor (HostCommandStream *hcs) {
return getPipeDescriptor(hcs, 0);
}
static int *
getOutputDescriptor (HostCommandStream *hcs) {
return getPipeDescriptor(hcs, 1);
}
static int *
getParentDescriptor (HostCommandStream *hcs) {
return hcs->isInput? getOutputDescriptor(hcs): getInputDescriptor(hcs);
}
static int *
getChildDescriptor (HostCommandStream *hcs) {
return hcs->isInput? getInputDescriptor(hcs): getOutputDescriptor(hcs);
}
int
constructHostCommandPackageData (HostCommandPackageData *pkg) {
pkg->pipe[0] = pkg->pipe[1] = -1;
return 1;
}
void
destructHostCommandPackageData (HostCommandPackageData *pkg) {
{
int *fileDescriptor = pkg->pipe;
const int *end = fileDescriptor + 2;
while (fileDescriptor < end) {
if (*fileDescriptor != -1) {
close(*fileDescriptor);
*fileDescriptor = -1;
}
fileDescriptor += 1;
}
}
}
int
prepareHostCommandStream (HostCommandStream *hcs, void *data) {
if (pipe(hcs->package.pipe) == -1) {
logSystemError("pipe");
return 0;
}
return 1;
}
static int
finishParentHostCommandStream (HostCommandStream *hcs, void *data) {
int *local = getParentDescriptor(hcs);
int *remote = getChildDescriptor(hcs);
close(*remote);
*remote = -1;
if (!finishHostCommandStream(hcs, *local)) return 0;
*local = -1;
return 1;
}
static int
finishChildHostCommandStream (HostCommandStream *hcs, void *data) {
int *local = getChildDescriptor(hcs);
int *remote = getParentDescriptor(hcs);
close(*remote);
*remote = -1;
if (close(hcs->fileDescriptor) == -1) {
logSystemError("close");
return 0;
}
if (fcntl(*local, F_DUPFD, hcs->fileDescriptor) == -1) {
logSystemError("fcntl[F_DUPFD]");
return 0;
}
close(*local);
*local = -1;
return 1;
}
int
runCommand (
int *result,
const char *const *command,
HostCommandStream *streams,
int asynchronous
) {
int ok = 0;
sigset_t newMask, oldMask;
pid_t pid;
sigemptyset(&newMask);
sigaddset(&newMask, SIGCHLD);
sigprocmask(SIG_BLOCK, &newMask, &oldMask);
switch ((pid = fork())) {
case -1: /* error */
logSystemError("fork");
break;
case 0: /* child */
sigprocmask(SIG_SETMASK, &oldMask, NULL);
if (processHostCommandStreams(streams, finishChildHostCommandStream, NULL)) {
execvp(command[0], (char *const*)command);
switch (errno) {
case ENOENT:
logMessage(LOG_ERR, "command not found: %s", command[0]);
break;
default:
logSystemError("execvp");
break;
}
}
_exit(1);
default: /* parent */
if (processHostCommandStreams(streams, finishParentHostCommandStream, NULL)) {
ok = 1;
if (asynchronous) {
*result = 0;
} else {
int status;
if (waitpid(pid, &status, 0) == -1) {
logSystemError("waitpid");
} else if (WIFEXITED(status)) {
*result = WEXITSTATUS(status);
logMessage(LOG_DEBUG, "host command exit status: %d: %s",
*result, command[0]);
} else if (WIFSIGNALED(status)) {
*result = WTERMSIG(status);
logMessage(LOG_DEBUG, "host command termination signal: %d: %s",
*result, command[0]);
*result += 0X80;
} else if (WIFSTOPPED(status)) {
*result = WSTOPSIG(status);
logMessage(LOG_DEBUG, "host command stop signal: %d: %s",
*result, command[0]);
*result += 0X80;
} else {
logMessage(LOG_DEBUG, "unknown host command status: 0X%X: %s",
status, command[0]);
}
}
}
break;
}
sigprocmask(SIG_SETMASK, &oldMask, NULL);
return ok;
}
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