php-ebpf/tests/tracepoint_test.php

<?php
/*
 * Copyright 2024 carl.guo <[email protected]>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

$prog = <<<EOT
TRACEPOINT_PROBE(syscalls, sys_enter_openat) {
    bpf_trace_printk("openat called\\n");
    return 0;
}
EOT;

try {
    $bpf = new Bpf(["text" => $prog]);
    echo "BPF program loaded successfully\n";
    
    // Start monitoring
    echo "Monitoring openat syscalls...\n";
    while (true) {
        try {
            list($task, $pid, $cpu, $flags, $ts, $msg) = $bpf->trace_fields();
            printf("%-18.9f %-16s %-6d %s\n", $ts, $task, $pid, $msg);
            flush();
        } catch (Exception $e) {
            continue;
        }
    }
} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
    exit(1);
}