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Preserve errno because this function is often used like
the following. The caller wants to report the error from the main
operation (`lseek` in this example), not from fd_object_release.
```
off_t ret = lseek(fd_number(fo), offset, nwhence);
fd_object_release(fo);
if (ret < 0)
return convert_errno(errno);
```
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| .. | ||
| sandboxed-system-primitives | ||
| libc_wasi_wrapper.c | ||
| libc_wasi_wrapper.h | ||
| libc_wasi.cmake | ||
| SConscript | ||