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ply-utils: Add function for getting current kmsg log levels

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We need to know two things:

1. What log level threshold to follow when showing kernel messages to
   the console

2. What log level to use if a message comes in without a log level

This commit adds a new function `ply_get_kmsg_log_levels` that
returns those two values.
This commit is contained in:
Ray Strode 2023-11-24 11:02:33 -05:00
parent 8fd5f9f249
commit 20b019a489
2 changed files with 63 additions and 0 deletions
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60
src/libply/ply-utils.c
View file

@ -997,6 +997,66 @@ int ply_guess_device_scale (uint32_t width,
return get_device_scale (width, height, 0, 0, true);
}
void
ply_get_kmsg_log_levels (int *current_log_level,
int *default_log_level)
{
static double last_update_time = 0;
static int cached_current_log_level = 0;
static int cached_default_log_level = 0;
char log_levels[4096] = "";
double current_time;
char *field, *fields;
int fd;
current_time = ply_get_timestamp ();
if ((current_time - last_update_time) < 1.0) {
*current_log_level = cached_current_log_level;
*default_log_level = cached_default_log_level;
return;
}
ply_trace ("opening /proc/sys/kernel/printk");
fd = open ("/proc/sys/kernel/printk", O_RDONLY);
if (fd < 0) {
ply_trace ("couldn't open it: %m");
return;
}
ply_trace ("reading kmsg log levels");
if (read (fd, log_levels, sizeof(log_levels) - 1) < 0) {
ply_trace ("couldn't read it: %m");
close (fd);
return;
}
close (fd);
field = strtok_r (log_levels, " \t", &fields);
if (field == NULL) {
ply_trace ("Couldn't parse current log level: %m");
return;
}
*current_log_level = atoi (field);
field = strtok_r (NULL, " \t", &fields);
if (field == NULL) {
ply_trace ("Couldn't parse default log level: %m");
return;
}
*default_log_level = atoi (field);
cached_current_log_level = *current_log_level;
cached_default_log_level = *default_log_level;
last_update_time = current_time;
}
static const char *
ply_get_kernel_command_line (void)
{

3
src/libply/ply-utils.h
View file

@ -148,6 +148,9 @@ int ply_get_device_scale (uint32_t width,
int ply_guess_device_scale (uint32_t width,
uint32_t height);
void ply_get_kmsg_log_levels (int *current_log_level,
int *default_log_level);
const char *ply_kernel_command_line_get_string_after_prefix (const char *prefix);
bool ply_kernel_command_line_has_argument (const char *argument);
void ply_kernel_command_line_override (const char *command_line);