libc/bionic/logd_write.c

/*
 * Copyright (C) 2008 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#include <time.h>
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <fcntl.h>

#include <cutils/logger.h>
#include "logd.h"

#include <pthread.h>

#define LOG_BUF_SIZE	1024

typedef enum {
    LOG_ID_MAIN = 0,
    LOG_ID_RADIO,
    LOG_ID_MAX
} log_id_t;

static int __write_to_log_init(log_id_t, struct iovec *vec);
static int (*write_to_log)(log_id_t, struct iovec *vec) = __write_to_log_init;
static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;

static int log_fds[(int)LOG_ID_MAX] = { -1, -1 };

static int __write_to_log_null(log_id_t log_fd, struct iovec *vec)
{
    return -1;
}

static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec)
{
    ssize_t ret;
    int log_fd;

    if ((int)log_id >= 0 && (int)log_id < (int)LOG_ID_MAX) {
        log_fd = log_fds[(int)log_id];
    } else {
        return EBADF;
    }

    do {
        ret = writev(log_fd, vec, 3);
    } while (ret < 0 && errno == EINTR);

    return ret;
}

static int __write_to_log_init(log_id_t log_id, struct iovec *vec)
{
    pthread_mutex_lock(&log_init_lock);

    if (write_to_log == __write_to_log_init) {
        log_fds[LOG_ID_MAIN] = open("/dev/"LOGGER_LOG_MAIN, O_WRONLY);
        log_fds[LOG_ID_RADIO] = open("/dev/"LOGGER_LOG_RADIO, O_WRONLY);

        write_to_log = __write_to_log_kernel;

        if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0) {
            close(log_fds[LOG_ID_MAIN]);
            close(log_fds[LOG_ID_RADIO]);
            log_fds[LOG_ID_MAIN] = -1;
            log_fds[LOG_ID_RADIO] = -1;
            write_to_log = __write_to_log_null;
        }
    }

    pthread_mutex_unlock(&log_init_lock);

    return write_to_log(log_id, vec);
}

static int __android_log_write(int prio, const char *tag, const char *msg)
{
    struct iovec vec[3];
    log_id_t log_id = LOG_ID_MAIN;

    if (!tag)
        tag = "";

    if (!strcmp(tag, "HTC_RIL"))
        log_id = LOG_ID_RADIO;

    vec[0].iov_base   = (unsigned char *) &prio;
    vec[0].iov_len    = 1;
    vec[1].iov_base   = (void *) tag;
    vec[1].iov_len    = strlen(tag) + 1;
    vec[2].iov_base   = (void *) msg;
    vec[2].iov_len    = strlen(msg) + 1;

    return write_to_log(log_id, vec);
}


static int __android_log_vprint(int prio, const char *tag, const char *fmt,
				va_list ap)
{
    char buf[LOG_BUF_SIZE];    

    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);

    return __android_log_write(prio, tag, buf);
}

int __libc_android_log_print(int prio, const char *tag, const char *fmt, ...)
{
    va_list ap;
    char buf[LOG_BUF_SIZE];    

    va_start(ap, fmt);
    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
    va_end(ap);

    return __android_log_write(prio, tag, buf);
}

int __libc_android_log_assert(const char *cond, const char *tag,
			      const char *fmt, ...)
{
    va_list ap;
    char buf[LOG_BUF_SIZE];    

    va_start(ap, fmt);
    vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
    va_end(ap);

    __android_log_write(ANDROID_LOG_FATAL, tag, buf);

    exit(1);

    return -1;
}