minecraft-pi-reborn/launcher/src/crash-report.c

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#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <signal.h>
#include <poll.h>
#include <libreborn/libreborn.h>
#include "crash-report.h"
// Show Crash Report Dialog
#ifndef MCPI_HEADLESS_MODE
#define DIALOG_TITLE "Crash Report"
#define CRASH_REPORT_DIALOG_WIDTH "640"
#define CRASH_REPORT_DIALOG_HEIGHT "480"
static void show_report(const char *log_filename) {
const char *command[] = {
"zenity",
"--title", DIALOG_TITLE,
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"--name", GUI_TITLE,
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"--width", CRASH_REPORT_DIALOG_WIDTH,
"--height", CRASH_REPORT_DIALOG_HEIGHT,
"--text-info",
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"--text", "Minecraft: Pi Edition: Reborn has crashed!\n\nNeed help? Consider asking on the <a href=\"https://discord.com/invite/aDqejQGMMy\">Discord server</a>!",
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"--filename", log_filename,
"--no-wrap",
"--font", "Monospace",
NULL
};
free(run_command(command, NULL));
}
#endif
// Exit Handler
static void exit_handler(__attribute__((unused)) int signal) {
// Murder
murder_children();
}
// Setup
void setup_crash_report() {
// Store Output
#ifndef MCPI_HEADLESS_MODE
int output_pipe[2];
safe_pipe2(output_pipe, 0);
int error_pipe[2];
safe_pipe2(error_pipe, 0);
#endif
// Fork
pid_t ret = fork();
if (ret == -1) {
ERR("Unable To Fork: %s", strerror(errno));
} else if (ret == 0) {
// Child Process
// Pipe stdio
#ifndef MCPI_HEADLESS_MODE
dup2(output_pipe[1], STDOUT_FILENO);
close(output_pipe[0]);
close(output_pipe[1]);
dup2(error_pipe[1], STDERR_FILENO);
close(error_pipe[0]);
close(error_pipe[1]);
#endif
// Create New Process Group
setpgid(0, 0);
// Continue Execution
} else {
// Parent Process
track_child(ret);
// Install Signal Handlers
struct sigaction act_sigint;
memset((void *) &act_sigint, 0, sizeof (struct sigaction));
act_sigint.sa_flags = SA_RESTART;
act_sigint.sa_handler = &exit_handler;
sigaction(SIGINT, &act_sigint, NULL);
struct sigaction act_sigterm;
memset((void *) &act_sigterm, 0, sizeof (struct sigaction));
act_sigterm.sa_flags = SA_RESTART;
act_sigterm.sa_handler = &exit_handler;
sigaction(SIGTERM, &act_sigterm, NULL);
// Capture stdio
#ifndef MCPI_HEADLESS_MODE
// Close Unneeded File Descriptors
close(output_pipe[1]);
close(error_pipe[1]);
// Create A Buffer
#define BUFFER_SIZE 1024
char buf[BUFFER_SIZE];
// Create Temporary File
char log_filename[] = "/tmp/.minecraft-pi-log-XXXXXX";
int log_file_fd = mkstemp(log_filename);
if (log_file_fd == -1) {
ERR("Unable To Create Log File: %s", strerror(errno));
}
// Setup Polling
int number_fds = 2;
struct pollfd poll_fds[number_fds];
poll_fds[0].fd = output_pipe[0];
poll_fds[1].fd = error_pipe[0];
for (int i = 0; i < number_fds; i++) {
poll_fds[i].events = POLLIN;
}
// Poll Data
int number_open_fds = number_fds;
while (number_open_fds > 0) {
int poll_ret = poll(poll_fds, number_fds, -1);
if (poll_ret == -1) {
if (errno == EINTR) {
continue;
} else {
ERR("Unable To Poll Data: %s", strerror(errno));
}
}
// Handle Data
for (int i = 0; i < number_fds; i++) {
if (poll_fds[i].revents != 0) {
if (poll_fds[i].revents & POLLIN) {
// Data Available
ssize_t bytes_read = read(poll_fds[i].fd, (void *) buf, BUFFER_SIZE - 1 /* Account For NULL-Terminator */);
if (bytes_read == -1) {
ERR("Unable To Read Log Data: %s", strerror(errno));
}
// Print To Terminal
buf[bytes_read] = '\0';
fprintf(i == 0 ? stdout : stderr, "%s", buf);
// Write To log
if (write(log_file_fd, (void *) buf, bytes_read) == -1) {
ERR("Unable To Write Log Data: %s", strerror(errno));
}
} else {
// File Descriptor No Longer Accessible
if (close(poll_fds[i].fd) == -1) {
ERR("Unable To Close File Descriptor: %s", strerror(errno));
}
number_open_fds--;
}
}
}
}
#endif
// Get Return Code
int status;
waitpid(ret, &status, 0);
untrack_child(ret);
// Check If Is Crash
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int is_crash = !is_exit_status_success(status);
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// Log Exit Code To log If Crash
if (is_crash) {
// Create Exit Code Log Line
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char *exit_status = NULL;
get_exit_status_string(status, &exit_status);
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char *exit_code_line = NULL;
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safe_asprintf(&exit_code_line, "[CRASH]: Terminated%s\n", exit_status);
free(exit_status);
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// Print Exit Code Log Line
fprintf(stderr, "%s", exit_code_line);
// Write Exit Code Log Line
#ifndef MCPI_HEADLESS_MODE
if (write(log_file_fd, (void *) exit_code_line, strlen(exit_code_line)) == -1) {
ERR("Unable To Write Exit Code To Log: %s", strerror(errno));
}
#endif
// Free Exit Code Log Line
free(exit_code_line);
}
// Show Crash Log
#ifndef MCPI_HEADLESS_MODE
// Close Log File FD
if (close(log_file_fd) == -1) {
ERR("Unable To Close Log File Descriptor: %s", strerror(errno));
}
// Show Report
if (is_crash) {
show_report(log_filename);
}
// Delete Log File
if (unlink(log_filename) == -1) {
ERR("Unable To Delete Log File: %s", strerror(errno));
}
#endif
// Exit
exit(WIFEXITED(status) ? WEXITSTATUS(status) : EXIT_FAILURE);
}
}