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handle linux returning EINVAL for large writes

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See #743
This commit is contained in:
Andrew Kelley 2018-02-05 13:21:08 -05:00
parent 40e4e42a66
commit 917e6fe370
1 changed files with 10 additions and 4 deletions
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14
std/os/index.zig
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@ -225,9 +225,15 @@ error BrokenPipe;
/// Calls POSIX write, and keeps trying if it gets interrupted.
pub fn posixWrite(fd: i32, bytes: []const u8) %void {
while (true) {
const write_ret = posix.write(fd, bytes.ptr, bytes.len);
const write_err = posix.getErrno(write_ret);
// Linux can return EINVAL when write amount is > 0x7ffff000
// See https://github.com/zig-lang/zig/pull/743#issuecomment-363165856
const max_bytes_len = 0x7ffff000;
var index: usize = 0;
while (index < bytes.len) {
const amt_to_write = math.min(bytes.len - index, usize(max_bytes_len));
const rc = posix.write(fd, &bytes[index], amt_to_write);
const write_err = posix.getErrno(rc);
if (write_err > 0) {
return switch (write_err) {
posix.EINTR => continue,
@ -244,7 +250,7 @@ pub fn posixWrite(fd: i32, bytes: []const u8) %void {
else => unexpectedErrorPosix(write_err),
};
}
return;
index += rc;
}
}