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#!/usr/bin/env bpftrace
/*
* statsnoop Trace stat() syscalls.
* For Linux, uses bpftrace and eBPF.
*
* This traces the tracepoints for statfs(), statx(), newstat(), and
* newlstat(). These aren't the only the stat syscalls: if you are missing
* activity, you may need to add more variants.
*
* Also a basic example of bpftrace.
*
* USAGE: statsnoop.bt
*
* This is a bpftrace version of the bcc tool of the same name.
*
* Copyright 2018 Netflix, Inc.
* Licensed under the Apache License, Version 2.0 (the "License")
*
* 08-Sep-2018 Brendan Gregg Created this.
*/
BEGIN
{
printf("Tracing stat syscalls... Hit Ctrl-C to end.\n");
printf("%-6s %-16s %3s %s\n", "PID", "COMM", "ERR", "PATH");
}
tracepoint:syscalls:sys_enter_statfs
{
@filename[tid] = args.pathname;
}
tracepoint:syscalls:sys_enter_statx,
tracepoint:syscalls:sys_enter_newstat,
tracepoint:syscalls:sys_enter_newlstat
{
@filename[tid] = args.filename;
}
tracepoint:syscalls:sys_exit_statfs,
tracepoint:syscalls:sys_exit_statx,
tracepoint:syscalls:sys_exit_newstat,
tracepoint:syscalls:sys_exit_newlstat
/@filename[tid]/
{
$ret = args.ret;
$errno = $ret >= 0 ? 0 : - $ret;
printf("%-6d %-16s %3d %s\n", pid, comm, $errno,
str(@filename[tid]));
delete(@filename[tid]);
}
END
{
clear(@filename);
}
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