DoxigAlpha
std › zig › system.preadAtLeast

preadAtLeast

Function parameters

Parameters

#
file:fs.File
buf:[]u8
offset:u64
min_read_len:usize

Type definitions in this namespace

Types

#

Return whether or not the given host is capable of running executables of

Functions

#
getExternalExecutor
Return whether or not the given host is capable of running executables of
resolveTargetQuery
Given a `Target.Query`, which specifies in detail which parts of the

Error sets in this namespace

Error Sets

#

Source

Implementation

#
fn preadAtLeast(file: fs.File, buf: []u8, offset: u64, min_read_len: usize) !usize {
    var i: usize = 0;
    while (i < min_read_len) {
        const len = file.pread(buf[i..], offset + i) catch |err| switch (err) {
            error.OperationAborted => unreachable, // Windows-only
            error.WouldBlock => unreachable, // Did not request blocking mode
            error.Canceled => unreachable, // timerfd is unseekable
            error.NotOpenForReading => unreachable,
            error.SystemResources => return error.SystemResources,
            error.IsDir => return error.UnableToReadElfFile,
            error.BrokenPipe => return error.UnableToReadElfFile,
            error.Unseekable => return error.UnableToReadElfFile,
            error.ConnectionResetByPeer => return error.UnableToReadElfFile,
            error.ConnectionTimedOut => return error.UnableToReadElfFile,
            error.SocketNotConnected => return error.UnableToReadElfFile,
            error.Unexpected => return error.Unexpected,
            error.InputOutput => return error.FileSystem,
            error.AccessDenied => return error.Unexpected,
            error.ProcessNotFound => return error.ProcessNotFound,
            error.LockViolation => return error.UnableToReadElfFile,
        };
        if (len == 0) return error.UnexpectedEndOfFile;
        i += len;
    }
    return i;
}