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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <dirent.h>
#include <limits.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <cutils/properties.h>
#include <sys/system_properties.h>
#include "dumpstate.h"
/* prints the contents of a file */
int dump_file(const char* path) {
char buffer[32768];
int fd, amount_read;
int ret = 0;
fd = open(path, O_RDONLY);
if (fd < 0)
return fd;
do {
ret = read(fd, buffer, sizeof(buffer));
if (ret > 0)
ret = write(STDOUT_FILENO, buffer, ret);
} while (ret > 0);
buffer[0] = '\n';
write(STDOUT_FILENO, buffer, 1);
close(fd);
return ret;
}
/* prints the contents of all files in a directory */
void dump_files(const char* path) {
DIR* dir;
struct dirent* entry;
char buffer[PATH_MAX];
dir = opendir(path);
if (!dir) {
fprintf(stderr, "could not open directory %s\n", path);
return;
}
while ((entry = readdir(dir))) {
if (entry->d_type == DT_REG) {
snprintf(buffer, sizeof(buffer), "%s/%s", path, entry->d_name);
dump_file(path);
printf("\n");
}
}
closedir(dir);
}
/* prints the name and value of a system property */
int print_property(const char* name) {
char value[PROP_VALUE_MAX];
__system_property_get(name, value);
printf("%s=%s\n", name, value);
return 0;
}
static pid_t alarm_pid = 0;
static int timed_out = 0;
static void sig_alarm(int sig)
{
if (alarm_pid) {
kill(alarm_pid, SIGKILL);
timed_out = 1;
alarm_pid = 0;
}
}
/* forks a command and waits for it to finish */
int run_command(struct Command* cmd, int timeout) {
struct sigaction sa;
pid_t pid;
int status;
pid = fork();
/* handle error case */
if (pid < 0)
return pid;
/* handle child case */
if (pid == 0) {
int ret = execv(cmd->path, cmd->args);
if (ret)
fprintf(stderr, "execv %s returned %d\n", cmd->path, ret);
exit(ret);
}
/* handle parent case */
timed_out = 0;
if (timeout) {
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_RESETHAND;
sa.sa_handler = sig_alarm;
sigaction(SIGALRM, &sa, NULL);
/* set an alarm so we don't hang forever */
alarm_pid = pid;
alarm(timeout);
}
waitpid(pid, &status, 0);
if (timed_out)
printf("ERROR: command %s timed out\n", cmd->path);
return status;
}
/* reads the current time into tm */
void get_time(struct tm *tm) {
time_t t;
tzset();
time(&t);
localtime_r(&t, tm);
}
/* prints the date in tm */
void print_date(const char* prompt, struct tm *tm) {
char strbuf[260];
strftime(strbuf, sizeof(strbuf),
"%a %b %e %H:%M:%S %Z %Y",
tm);
printf("%s%s\n", prompt, strbuf);
}
static void print_prop(const char *key, const char *name,
void *user __attribute__((unused)))
{
printf("[%s]: [%s]\n", key, name);
}
/* prints all the system properties */
void print_properties() {
property_list(print_prop, NULL);
}
/* creates directories as needed for the given path */
void create_directories(char *path)
{
char *chp = path;
/* skip initial slash */
if (chp[0] == '/')
chp++;
while (chp && chp[0]) {
chp = strchr(chp, '/');
if (chp) {
*chp = 0;
mkdir(path, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
*chp = '/';
chp++;
}
}
}
/* runs the vibrator using the given pattern */
void vibrate_pattern(int fd, int* pattern)
{
struct timespec tm;
char buffer[10];
while (*pattern) {
/* read vibrate on time */
int on_time = *pattern++;
snprintf(buffer, sizeof(buffer), "%d", on_time);
write(fd, buffer, strlen(buffer));
/* read vibrate off time */
int delay = *pattern++;
if (delay) {
delay += on_time;
tm.tv_sec = delay / 1000;
tm.tv_nsec = (delay % 1000) * 1000000;
nanosleep(&tm, NULL);
} else
break;
}
}
/* prevents the OOM killer from killing us */
void protect_from_oom_killer()
{
int fd;
fd = open("/proc/self/oom_adj", O_WRONLY);
if (fd >= 0) {
// -17 should make us immune to OOM
const char* text = "-17";
write(fd, text, strlen(text));
close(fd);
}
}
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