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// Copyright (C) 2011 The Android Open Source Project
//
// This software is licensed under the terms of the GNU General Public
// License version 2, as published by the Free Software Foundation, and
// may be copied, distributed, and modified under those terms.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
#include "android/log-rotate.h"
#include "net/net.h"
#include "slirp-android/libslirp.h"
#include "sysemu/sysemu.h"
#include <stdio.h>
#ifdef _WIN32
void qemu_log_rotation_init(void) {
// Nothing to do on Win32 for now.
}
void qemu_log_rotation_poll(void) {
// Nothing to do on Win32 for now.
}
#else // !_WIN32
#include <sys/signal.h>
static int rotate_logs_requested = 0;
static void rotate_qemu_logs_handler(int signum) {
rotate_logs_requested = 1;
}
void qemu_log_rotation_init(void) {
// Install SIGUSR1 signal handler.
struct sigaction act;
sigfillset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = rotate_qemu_logs_handler;
if (sigaction(SIGUSR1, &act, NULL) == -1) {
fprintf(stderr, "Failed to setup SIGUSR1 handler to clear Qemu logs\n");
exit(-1);
}
}
// Clears the passed qemu log when the rotate_logs_requested
// is set. We need to clear the logs between the tasks that do not
// require restarting Qemu.
static FILE* rotate_log(FILE* old_log_fd, const char* filename) {
FILE* new_log_fd = NULL;
if (old_log_fd) {
if (fclose(old_log_fd) == -1) {
fprintf(stderr, "Cannot close old_log fd\n");
exit(errno);
}
}
if (!filename) {
fprintf(stderr, "The log filename to be rotated is not provided");
exit(-1);
}
new_log_fd = fopen(filename , "wb+");
if (new_log_fd == NULL) {
fprintf(stderr, "Cannot open the log file: %s for write.\n",
filename);
exit(1);
}
return new_log_fd;
}
void qemu_log_rotation_poll(void) {
if (!rotate_logs_requested)
return;
FILE* new_dns_log_fd = rotate_log(get_slirp_dns_log_fd(),
dns_log_filename);
FILE* new_drop_log_fd = rotate_log(get_slirp_drop_log_fd(),
drop_log_filename);
slirp_dns_log_fd(new_dns_log_fd);
slirp_drop_log_fd(new_drop_log_fd);
rotate_logs_requested = 0;
}
#endif // !_WIN32
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