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-rw-r--r--toys/lsb/dmesg.c32
1 files changed, 20 insertions, 12 deletions
diff --git a/toys/lsb/dmesg.c b/toys/lsb/dmesg.c
index 45319b60..c88fe113 100644
--- a/toys/lsb/dmesg.c
+++ b/toys/lsb/dmesg.c
@@ -15,8 +15,8 @@ config DMESG
Print or control the kernel ring buffer.
- -C Clear the ring buffer
- -c Clear the ring buffer after printing
+ -C Clear ring buffer without printing
+ -c Clear ring buffer after printing
-n Set kernel logging LEVEL (1-9)
-r Raw output (with <level markers>)
-s Show the last SIZE many bytes
@@ -35,18 +35,24 @@ GLOBALS(
int color;
)
+static int xklogctl(int type, char *buf, int len)
+{
+ int rc = klogctl(type, buf, len);
+
+ if (rc<0) perror_exit("klogctl");
+
+ return rc;
+}
+
// Use klogctl for reading if we're on a pre-3.5 kernel.
static void legacy_mode() {
char *data, *to, *from;
int size;
// Figure out how much data we need, and fetch it.
- size = TT.size;
- if (!size && 1>(size = klogctl(10, 0, 0))) perror_exit("klogctl");;
+ if (!(size = TT.size)) size = xklogctl(10, 0, 0);
data = to = from = xmalloc(size+1);
- size = klogctl(3 + (toys.optflags & FLAG_c), data, size);
- if (size < 0) perror_exit("klogctl");
- data[size] = 0;
+ data[size = xklogctl(3 + (toys.optflags & FLAG_c), data, size)] = 0;
// Filter out level markers and optionally time markers
if (!(toys.optflags & FLAG_r)) while ((from - data) < size) {
@@ -75,21 +81,23 @@ static void color(int c) {
void dmesg_main(void)
{
- // For -n just tell kernel to which messages to keep.
+ // For -n just tell kernel which messages to keep.
if (toys.optflags & FLAG_n) {
- if (klogctl(8, NULL, TT.level)) perror_exit("klogctl");
+ xklogctl(8, 0, TT.level);
+
return;
}
// For -C just tell kernel to throw everything out.
if (toys.optflags & FLAG_C) {
- if (klogctl(5, NULL, 0)) perror_exit("klogctl");
+ xklogctl(5, 0, 0);
+
return;
}
TT.color = isatty(1);
- // http://lxr.free-electrons.com/source/Documentation/ABI/testing/dev-kmsg
+ // http://kernel.org/doc/Documentation/ABI/testing/dev-kmsg
// Each read returns one message. By default, we block when there are no
// more messages (--follow); O_NONBLOCK is needed for for usual behavior.
@@ -143,7 +151,7 @@ void dmesg_main(void)
text += subsystem;
color(0);
}
- if (!((facpri&7) <= 3)) puts(text);
+ if (!((facpri&7) <= 3)) xputs(text);
else {
color(31);
printf("%s", text);