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Make piping data into shell commands non blocking

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Fixes #1180
This commit is contained in:
Maxime Coste 2017-02-03 01:14:42 +00:00
parent d90919568a
commit 02b7e58481
1 changed files with 29 additions and 4 deletions
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33
src/shell_manager.cc
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@ -13,6 +13,7 @@
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <cstdlib>
extern char **environ;
@ -180,9 +181,6 @@ std::pair<String, int> ShellManager::eval(
child_stdout.close_write_fd();
child_stderr.close_write_fd();
write(child_stdin.write_fd(), input);
child_stdin.close_write_fd();
auto wait_time = Clock::now();
struct PipeReader : FDWatcher
@ -206,9 +204,36 @@ std::pair<String, int> ShellManager::eval(
{}
};
struct PipeWriter : FDWatcher
{
PipeWriter(Pipe& pipe, StringView contents)
: FDWatcher(pipe.write_fd(), FdEvents::Write,
[contents, &pipe](FDWatcher& watcher, FdEvents, EventMode) mutable {
while (fd_writable(pipe.write_fd()))
{
ssize_t size = ::write(pipe.write_fd(), contents.begin(),
(size_t)contents.length());
if (size > 0)
contents = contents.substr(ByteCount{(int)size});
if (size == -1 and (errno = EAGAIN or errno == EWOULDBLOCK))
return;
if (size < 0 or contents.empty())
{
pipe.close_write_fd();
watcher.disable();
}
}
})
{
int flags = fcntl(pipe.write_fd(), F_GETFL, 0);
fcntl(pipe.write_fd(), F_SETFL, flags | O_NONBLOCK);
}
};
String stdout_contents, stderr_contents;
PipeReader stdout_reader{child_stdout, stdout_contents};
PipeReader stderr_reader{child_stderr, stderr_contents};
PipeWriter stdin_writer{child_stdin, input};
// block SIGCHLD to make sure we wont receive it before
// our call to pselect, that will end up blocking indefinitly.
@ -235,7 +260,7 @@ std::pair<String, int> ShellManager::eval(
wait_notified = true;
}, EventMode::Urgent};
while (not terminated or
while (not terminated or child_stdin.write_fd() != -1 or
((flags & Flags::WaitForStdout) and
(child_stdout.read_fd() != -1 or child_stderr.read_fd() != -1)))
{