Mercurial > hg
view rust/chg/src/sendfds.c @ 44147:5e84a96d865b
python-zstandard: blacken at 80 characters
I made this change upstream and it will make it into the next
release of python-zstandard. I figured I'd send it Mercurial's
way because it will allow us to drop this directory from the black
exclusion list.
# skip-blame blackening
Differential Revision: https://phab.mercurial-scm.org/D7937
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Wed, 22 Jan 2020 22:23:04 -0800 |
parents | 208cb7a9d0fa |
children |
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/* * Utility to send fds via Unix domain socket * * Copyright 2011, 2018 Yuya Nishihara <yuya@tcha.org> * * This software may be used and distributed according to the terms of the * GNU General Public License version 2 or any later version. */ #include <errno.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <sys/types.h> #define MAX_FD_LEN 10 /* * Sends the given fds with 1-byte dummy payload. * * Returns the number of bytes sent on success, -1 on error and errno is set * appropriately. */ ssize_t sendfds(int sockfd, const int *fds, size_t fdlen) { char dummy[1] = {0}; struct iovec iov = {dummy, sizeof(dummy)}; char fdbuf[CMSG_SPACE(sizeof(fds[0]) * MAX_FD_LEN)]; struct msghdr msgh; struct cmsghdr *cmsg; /* just use a fixed-size buffer since we'll never send tons of fds */ if (fdlen > MAX_FD_LEN) { errno = EINVAL; return -1; } memset(&msgh, 0, sizeof(msgh)); msgh.msg_iov = &iov; msgh.msg_iovlen = 1; msgh.msg_control = fdbuf; msgh.msg_controllen = CMSG_SPACE(sizeof(fds[0]) * fdlen); cmsg = CMSG_FIRSTHDR(&msgh); cmsg->cmsg_level = SOL_SOCKET; cmsg->cmsg_type = SCM_RIGHTS; cmsg->cmsg_len = CMSG_LEN(sizeof(fds[0]) * fdlen); memcpy(CMSG_DATA(cmsg), fds, sizeof(fds[0]) * fdlen); msgh.msg_controllen = cmsg->cmsg_len; return sendmsg(sockfd, &msgh, 0); }