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19b6eea150
Collect the dm log to dmesg for profiing. These mesage will be easy to profile when dm booting. Tracked-On: #2336 Signed-off-by: Wei Liu <weix.w.liu@intel.com> Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
70 lines
1.0 KiB
C
70 lines
1.0 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include "dm_kmsg.h"
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int fd_kmsg;
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char dm_buf[DM_BUF];
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static int open_kmsg(void);
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static int close_kmsg(void);
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static int open_kmsg(void)
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{
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int fd;
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/* open /dev/kmsg */
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fd = open(KERN_NODE, O_RDWR | O_APPEND | O_NONBLOCK);
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if (fd < 0) {
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perror(KMSG_FMT"open_kmsg");
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return fd;
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}
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fd_kmsg = fd;
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return fd;
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}
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static int close_kmsg(void)
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{
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int err;
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/* close /dev/kmsg */
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err = close(fd_kmsg);
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if (err == -1) {
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perror(KMSG_FMT"close_kmsg");
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return err;
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}
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return 0;
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}
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void write_kmsg(const char *fmt, ...)
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{
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int write_cnt;
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va_list args;
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va_start(args, fmt);
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vsnprintf(dm_buf, DM_BUF, fmt, args);
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va_end(args);
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open_kmsg();
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/* write the fmt to the /dev/kmsg */
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write_cnt = write(fd_kmsg, dm_buf, strlen(dm_buf));
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if (write_cnt < 0) {
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perror(KMSG_FMT"write_kmsg");
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}
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close_kmsg();
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return;
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}
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