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47 lines
1.1 KiB
47 lines
1.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* bpf-script-test-prologue.c |
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* Test BPF prologue |
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*/ |
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#ifndef LINUX_VERSION_CODE |
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# error Need LINUX_VERSION_CODE |
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# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig' |
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#endif |
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#define SEC(NAME) __attribute__((section(NAME), used)) |
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#include <uapi/linux/fs.h> |
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/* |
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* If CONFIG_PROFILE_ALL_BRANCHES is selected, |
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* 'if' is redefined after include kernel header. |
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* Recover 'if' for BPF object code. |
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*/ |
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#ifdef if |
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# undef if |
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#endif |
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#define FMODE_READ 0x1 |
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#define FMODE_WRITE 0x2 |
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static void (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) = |
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(void *) 6; |
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SEC("func=null_lseek file->f_mode offset orig") |
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int bpf_func__null_lseek(void *ctx, int err, unsigned long _f_mode, |
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unsigned long offset, unsigned long orig) |
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{ |
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fmode_t f_mode = (fmode_t)_f_mode; |
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if (err) |
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return 0; |
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if (f_mode & FMODE_WRITE) |
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return 0; |
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if (offset & 1) |
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return 0; |
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if (orig == SEEK_CUR) |
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return 0; |
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return 1; |
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} |
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char _license[] SEC("license") = "GPL"; |
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int _version SEC("version") = LINUX_VERSION_CODE;
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