/* Create a one-way communication channel (pipe).
Actually the channel is two-way on the Hurd.
If successful, two file descriptors are stored in FDS;
bytes written on FDS[1] can be read from FDS[0].
Apply FLAGS to the new file descriptors.
Returns 0 if successful, -1 if not. */
int
__pipe2 (int fds[2], int flags)
{
int save_errno = errno;
int result;
if (flags & ~(O_CLOEXEC | O_NONBLOCK))
return __hurd_fail (EINVAL);
flags = o_to_sock_flags (flags);
/* The magic S_IFIFO protocol tells the pflocal server to create
sockets which report themselves as FIFOs, as POSIX requires for
pipes. */
result = __socketpair (PF_LOCAL, SOCK_STREAM | flags, S_IFIFO, fds);
if (result == -1 && errno == EPROTONOSUPPORT)
{
/* We contacted an "old" pflocal server that doesn't support the
magic S_IFIFO protocol.
FIXME: Remove this junk somewhere in the future. */
__set_errno (save_errno);
return __socketpair (PF_LOCAL, SOCK_STREAM | flags, 0, fds);
}
return result;
}
/* Create a one-way communication channel (pipe).
Actually the channel is two-way on the Hurd.
If successful, two file descriptors are stored in FDS;
bytes written on FDS[1] can be read from FDS[0].
Returns 0 if successful, -1 if not. */
int
__pipe (int fds[2])
{
int save_errno = errno;
int result;
/* The magic S_IFIFO protocol tells the pflocal server to create
sockets which report themselves as FIFOs, as POSIX requires for
pipes. */
result = __socketpair (PF_LOCAL, SOCK_STREAM, S_IFIFO, fds);
if (result == -1 && errno == EPROTONOSUPPORT)
{
/* We contacted an "old" pflocal server that doesn't support the
magic S_IFIFO protocol.
FIXME: Remove this junk somewhere in the future. */
__set_errno (save_errno);
return __socketpair (PF_LOCAL, SOCK_STREAM, 0, fds);
}
return result;
}
