Index wasi args_get args_sizes_get clock_res_get clock_time_get environ_get environ_sizes_get fd_advise fd_allocate fd_close fd_datasync fd_fdstat_get fd_fdstat_set_flags fd_fdstat_set_rights fd_filestat_get fd_filestat_set_size fd_filestat_set_times fd_pread fd_prestat_dir_name fd_prestat_get fd_pwrite fd_read fd_readdir fd_renumber fd_seek fd_sync fd_tell fd_write file_stat_flags filestat iovec lookup_flags path_create_directory path_filestat_get path_filestat_set_times path_link path_open path_readlink path_remove_directory path_rename path_symlink path_unlink_file poll_oneoff proc_exit proc_raise random_get sched_yield sock_accept sock_recv sock_send sock_shutdown
Get metadata of a file descriptor
fd_fdstat_get (
fd: i32The file descriptor whose metadata will be accessedbuf_ptr: i32A WebAssembly pointer to a memory location where the metadata will be written
) =>
error: i32 

The fd_fdstat_get() function is used to retrieve the metadata of a file descriptor. It provides information about the state of the file descriptor, such as its rights, flags, and file type.

In POSIX systems, file descriptors are small, non-negative integers used to represent open files, sockets, or other I/O resources. They serve as handles that allow processes to read from or write to these resources. The fd_fdstat_get() function allows applications to retrieve information about a specific file descriptor, gaining insights into its properties and characteristics.

POSIX Context

In POSIX-compliant systems, file descriptors are fundamental to I/O operations. They are obtained through various system calls such as open(), socket(), or pipe(). Each file descriptor maintains its own set of properties, including access rights, flags, and file type.

The fd_fdstat_get() function corresponds to the POSIX fstat() system call, which retrieves information about an open file descriptor. By invoking fd_fdstat_get(), applications can query the metadata associated with a file descriptor and access relevant details, such as the file's mode, size, or ownership.

Note

The fd_fdstat_get() function retrieves the metadata of the specified file descriptor. It writes the metadata to the provided memory location. This allows applications to examine the properties of a file descriptor and make informed decisions based on its characteristics.

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