31 lines
761 B
Diff
31 lines
761 B
Diff
---
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util-linux/dmesg.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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--- a/util-linux/dmesg.c
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+++ b/util-linux/dmesg.c
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@@ -12,6 +12,14 @@
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#include <sys/klog.h>
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#include "libbb.h"
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+static int kernel_ringbuffer_size(void)
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+{
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+ int len = klogctl(10, NULL, 0);
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+ if (len > 0)
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+ return len;
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+ return 16384;
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+}
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+
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int dmesg_main(int argc, char **argv);
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int dmesg_main(int argc, char **argv)
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{
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@@ -25,7 +33,7 @@ int dmesg_main(int argc, char **argv)
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int len;
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char *buf;
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- len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : 16384;
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+ len = (flags & 2) ? xatoul_range(size, 2, INT_MAX) : kernel_ringbuffer_size();
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buf = xmalloc(len);
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if (0 > (len = klogctl(3 + (flags & 1), buf, len)))
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bb_perror_msg_and_die("klogctl");
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