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iochannel/pstream: Support sending file descriptors

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This patch adds support to iochannel, pstream and pstream-util
to send file descriptors over a unix pipe.

Currently we don't support writing both creds and fds in the same
packet, it's either one or the other (or neither).

Signed-off-by: David Henningsson <david.henningsson@canonical.com>
This commit is contained in:
David Henningsson 2014-04-15 16:12:25 +02:00
parent 06bc22b220
commit cb484805c1
6 changed files with 102 additions and 22 deletions
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43
src/pulsecore/iochannel.c
View file

@ -348,6 +348,49 @@ ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l
return r;
}
ssize_t pa_iochannel_write_with_fds(pa_iochannel*io, const void*data, size_t l, int nfd, const int *fds) {
ssize_t r;
int *msgdata;
struct msghdr mh;
struct iovec iov;
union {
struct cmsghdr hdr;
uint8_t data[CMSG_SPACE(sizeof(int) * MAX_ANCIL_FDS)];
} cmsg;
pa_assert(io);
pa_assert(data);
pa_assert(l);
pa_assert(io->ofd >= 0);
pa_assert(fds);
pa_assert(nfd > 0);
pa_assert(nfd <= MAX_ANCIL_FDS);
pa_zero(iov);
iov.iov_base = (void*) data;
iov.iov_len = l;
pa_zero(cmsg);
cmsg.hdr.cmsg_level = SOL_SOCKET;
cmsg.hdr.cmsg_type = SCM_RIGHTS;
msgdata = (int*) CMSG_DATA(&cmsg.hdr);
memcpy(msgdata, fds, nfd * sizeof(int));
cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(int) * nfd);
pa_zero(mh);
mh.msg_iov = &iov;
mh.msg_iovlen = 1;
mh.msg_control = &cmsg;
mh.msg_controllen = sizeof(cmsg);
if ((r = sendmsg(io->ofd, &mh, MSG_NOSIGNAL)) >= 0) {
io->writable = io->hungup = false;
enable_events(io);
}
return r;
}
ssize_t pa_iochannel_read_with_ancil(pa_iochannel*io, void*data, size_t l, pa_ancil *ancil) {
ssize_t r;
struct msghdr mh;