152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
/*
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* Copyright (c) Huawei Technologies Co., Ltd. 2012-2018. All rights reserved.
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*
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* Description: drivers to write messages to exception node
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* Author: wangtanyun <wangtanyun@huawei.com>
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*/
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#include <linux/version.h>
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#include <linux/uio.h>
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#include <log/hw_log.h>
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#include <log/log_exception.h>
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#define HWLOG_TAG log_exception
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HWLOG_REGIST();
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static int CHECK_CODE = 0x7BCDABCD;
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/*
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* log_to_exception - write command to /dev/log/exception
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* @tag: tag of the command
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* @msg: command string to write
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* Returns number of bytes written or error code
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*/
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int log_to_exception(char *tag, char *msg)
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{
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0))
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struct iov_iter iter;
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#else
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mm_segment_t oldfs;
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#endif
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struct file *filp;
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unsigned char prio_err = 6; //ANDROID_ERROR
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int ret = 0;
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struct iovec vec[5];
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unsigned long vcount = 0;
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if (tag == NULL || msg == NULL) {
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hwlog_err("%s: invalid arguments\n", __func__);
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return -EINVAL;
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}
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hwlog_info("%s: exception tag '%s' msg '%s'", __func__, tag, msg);
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filp = filp_open(LOG_EXCEPTION_FS, O_RDWR, 0);
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if (filp == NULL || IS_ERR(filp)) {
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hwlog_err("%s: access '%s' failed.\n",
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__func__, LOG_EXCEPTION_FS);
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return -ENODEV;
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}
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vcount = 0;
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vec[vcount].iov_base = &CHECK_CODE;
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vec[vcount++].iov_len = sizeof(CHECK_CODE);
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vec[vcount].iov_base = &prio_err;
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vec[vcount++].iov_len = 1;
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vec[vcount].iov_base = tag;
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vec[vcount++].iov_len = strlen(tag) + 1;
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vec[vcount].iov_base = msg;
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vec[vcount++].iov_len = strlen(msg) + 1;
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0))
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iov_iter_init(&iter, WRITE, vec, vcount, iov_length(vec, vcount));
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ret = vfs_iter_write(filp, &iter, &filp->f_pos, 0);
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#else
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oldfs = get_fs();
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set_fs(KERNEL_DS);
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
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ret = vfs_writev(filp, vec, vcount, &filp->f_pos, 0);
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#else
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ret = vfs_writev(filp, vec, vcount, &filp->f_pos);
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#endif
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set_fs(oldfs);
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#endif
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if (ret < 0) {
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hwlog_err("%s: write '%s' failed: %d\n",
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__func__, LOG_EXCEPTION_FS, ret);
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filp_close(filp, NULL);
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return -EIO;
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}
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filp_close(filp, NULL);
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return ret;
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}
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EXPORT_SYMBOL(log_to_exception);
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int logbuf_to_exception(char category, int level, char log_type,
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char sn, void *msg, int msglen)
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{
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0))
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struct iov_iter iter;
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#else
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mm_segment_t oldfs;
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#endif
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struct file *filp = NULL;
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int ret = 0;
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struct idapheader idaphdr;
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struct iovec vec[5];
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unsigned long vcount = 0;
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if (msg == NULL || msglen < 0) {
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hwlog_err("%s: invalid arguments\n", __func__);
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return -EINVAL;
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}
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hwlog_info("%s: exception msg '%s'", __func__, (char *)msg);
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filp = filp_open(LOG_EXCEPTION_FS, O_RDWR, 0);
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if (filp == NULL || IS_ERR(filp)) {
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hwlog_err("%s: access '%s' failed.\n",
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__func__, LOG_EXCEPTION_FS);
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return -ENODEV;
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}
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idaphdr.level = level;
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idaphdr.category = category;
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idaphdr.log_type = log_type;
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idaphdr.sn = sn;
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vcount = 0;
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vec[vcount].iov_base = &CHECK_CODE;
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vec[vcount++].iov_len = sizeof(CHECK_CODE);
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vec[vcount].iov_base = (void *)&idaphdr;
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vec[vcount++].iov_len = sizeof(idaphdr);
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vec[vcount].iov_base = msg;
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vec[vcount++].iov_len = msglen;
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0))
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iov_iter_init(&iter, WRITE, vec, vcount, iov_length(vec, vcount));
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ret = vfs_iter_write(filp, &iter, &filp->f_pos, 0);
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#else
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oldfs = get_fs();
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set_fs(KERNEL_DS);
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
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ret = vfs_writev(filp, vec, vcount, &filp->f_pos, 0);
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#else
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ret = vfs_writev(filp, vec, vcount, &filp->f_pos);
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#endif
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set_fs(oldfs);
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#endif
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if (ret < 0) {
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hwlog_err("%s: write '%s' failed: %d\n",
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__func__, LOG_EXCEPTION_FS, ret);
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filp_close(filp, NULL);
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return -EIO;
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}
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filp_close(filp, NULL);
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return ret;
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}
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EXPORT_SYMBOL(logbuf_to_exception);
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