Function fstat [src]

Return information about a file descriptor.

Prototype

pub fn fstat(fd: fd_t) FStatError!Stat

Parameters

fd: fd_t

Possible Errors

AccessDenied

In WASI, this error may occur when the file descriptor does not hold the required rights to get its filestat information.

PermissionDenied

SystemResources

Unexpected UnexpectedError

The Operating System returned an undocumented error code.

This error is in theory not possible, but it would be better to handle this error than to invoke undefined behavior.

When this error code is observed, it usually means the Zig Standard Library needs a small patch to add the error code to the error set for the respective function.

Source

  pub fn fstat(fd: fd_t) FStatError!Stat {
    if (native_os == .wasi and !builtin.link_libc) {
        return Stat.fromFilestat(try std.os.fstat_wasi(fd));
    }
    if (native_os == .windows) {
        @compileError("fstat is not yet implemented on Windows");
    }

    const fstat_sym = if (lfs64_abi) system.fstat64 else system.fstat;
    var stat = mem.zeroes(Stat);
    switch (errno(fstat_sym(fd, &stat))) {
        .SUCCESS => return stat,
        .INVAL => unreachable,
        .BADF => unreachable, // Always a race condition.
        .NOMEM => return error.SystemResources,
        .ACCES => return error.AccessDenied,
        else => |err| return unexpectedErrno(err),
    }
}  