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Helper Function 'bpf_probe_read_str' |
This page documents the 'bpf_probe_read_str' eBPF helper function, including its defintion, usage, program types that can use it, and examples. |
Copyright (c) 2015 The Libbpf Authors. All rights reserved.
Copy a NUL terminated string from an unsafe kernel address unsafe_ptr to dst. See bpf_probe_read_kernel_str() for more details.
Generally, use bpf_probe_read_user_str() or bpf_probe_read_kernel_str() instead.
On success, the strictly positive length of the string, including the trailing NUL character. On error, a negative value.
#!c static long (* const bpf_probe_read_str)(void *dst, __u32 size, const void *unsafe_ptr) = (void *) 45;
!!! example "Docs could be improved" This part of the docs is incomplete, contributions are very welcome
This helper call can be used in the following program types:
- BPF_PROG_TYPE_KPROBE
- BPF_PROG_TYPE_LSM
- BPF_PROG_TYPE_PERF_EVENT
- BPF_PROG_TYPE_RAW_TRACEPOINT
- BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE
- BPF_PROG_TYPE_SYSCALL
- BPF_PROG_TYPE_TRACEPOINT
- BPF_PROG_TYPE_TRACING
!!! example "Docs could be improved" This part of the docs is incomplete, contributions are very welcome