LXR linux/arch/um/kernel/kmsg

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/kmsg_dump.h>
   3#include <linux/console.h>
   4#include <linux/string.h>
   5#include <shared/init.h>
   6#include <shared/kern.h>
   7#include <os.h>
   8
   9static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
  10                                enum kmsg_dump_reason reason)
  11{
  12        static char line[1024];
  13        struct console *con;
  14        size_t len = 0;
  15
  16        /* only dump kmsg when no console is available */
  17        if (!console_trylock())
  18                return;
  19
  20        for_each_console(con) {
  21                if(strcmp(con->name, "tty") == 0 &&
  22                   (con->flags & (CON_ENABLED | CON_CONSDEV)) != 0) {
  23                        break;
  24                }
  25        }
  26
  27        console_unlock();
  28
  29        if (con)
  30                return;
  31
  32        printf("kmsg_dump:\n");
  33        while (kmsg_dump_get_line(dumper, true, line, sizeof(line), &len)) {
  34                line[len] = '\0';
  35                printf("%s", line);
  36        }
  37}
  38
  39static struct kmsg_dumper kmsg_dumper = {
  40        .dump = kmsg_dumper_stdout
  41};
  42
  43int __init kmsg_dumper_stdout_init(void)
  44{
  45        return kmsg_dump_register(&kmsg_dumper);
  46}
  47
  48__uml_postsetup(kmsg_dumper_stdout_init);
  49