34 lines
764 B
C
Executable file
34 lines
764 B
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* Hook into 'openat' syscall entry tracepoint
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*
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* Test it with:
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*
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* perf trace -e tools/perf/examples/bpf/sys_enter_openat.c cat /etc/passwd > /dev/null
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*
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* It'll catch some openat syscalls related to the dynamic linked and
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* the last one should be the one for '/etc/passwd'.
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*
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* The syscall_enter_openat_args can be used to get the syscall fields
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* and use them for filtering calls, i.e. use in expressions for
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* the return value.
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*/
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#include <bpf.h>
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struct syscall_enter_openat_args {
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unsigned long long unused;
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long syscall_nr;
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long dfd;
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char *filename_ptr;
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long flags;
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long mode;
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};
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int syscall_enter(openat)(struct syscall_enter_openat_args *args)
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{
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return 1;
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}
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license(GPL);
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