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#include "process.ih"
// See ../README.process-pipe for an explanation of the inner workings of
// operator|
namespace FBB
{
Process &operator|(Process &lhs, Process &rhs)
{
// make sure output is available
if (not (lhs.d_mode & Process::MERGE_COUT_CERR))
{
lhs.d_mode |= Process::COUT;
lhs.d_setMode |= Process::COUT;
}
// all but the first process has IN_PIPE set
if
(
(lhs.d_setMode & Process::CIN)
&&
not (lhs.d_setMode & Process::IN_PIPE)
)
lhs.d_setMode |= Process::CLOSE_ON_EXEC;
lhs.d_setMode |= Process::OUT_PIPE; // This is the output end of the pipe
lhs.start(); // forking() does the real work
#ifdef BOBCAT_DIY_CLOEXEC_
rhs.d_closedByChild = lhs.d_closedByChild; // children close the initial
// writing ends of the pipes
// to the 1st process
#endif
rhs.d_oChildInPipe = lhs.d_iChildOutPipe;
// copy the input fm the lhs's child to the rhs's
// output. lhs.iChildOutPipe only has an open
// read-pipe and will be available to the rhs's
// child process to read via its stdin, thus
// connecting lhs's output to the rhs's input
if (lhs.d_oChildIn.rdbuf() != 0)
{
lhs.d_oChildIn.rdbuf(0);
rhs.d_oChildInbuf.open(lhs.d_oChildInbuf.fd(), 200);
rhs.d_oChildIn.rdbuf(&rhs.d_oChildInbuf);
}
// this is the input end of the pipe
rhs.d_setMode |= Process::IN_PIPE | Process::CIN;
rhs.d_mode |= Process::CIN;
return rhs; // to start do, e.g., (p1|p2).start()
}
}
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