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0e35cd6f3e
* It is tough to contribute to a project that doesn't use a formatter, * It is extra hard to contribute to a project which has configured the formatter, but ignores it for some files * Code formatting makes it harder to hide obscure / weird bugs by accident or on purpose, Let's rip the bandaid off? Note that PRs currently in flight should be able to be merged relatively easily by applying `clang-format` to their tip prior to merge. Co-authored-by: Graham Christensen <graham@grahamc.com>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
#include <sys/socket.h>
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#include <sys/un.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <assert.h>
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int main(int argc, char ** argv)
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{
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assert(argc == 2);
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int sock = socket(AF_UNIX, SOCK_STREAM, 0);
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// Set up a abstract domain socket path to connect to.
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struct sockaddr_un data;
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data.sun_family = AF_UNIX;
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data.sun_path[0] = 0;
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strncpy(data.sun_path + 1, argv[1], sizeof(data.sun_path) - 2);
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// Now try to connect, To ensure we work no matter what order we are
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// executed in, just busyloop here.
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int res = -1;
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while (res < 0) {
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res = connect(
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sock, (const struct sockaddr *) &data, offsetof(struct sockaddr_un, sun_path) + strlen(argv[1]) + 1);
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if (res < 0 && errno != ECONNREFUSED)
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perror("connect");
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if (errno != ECONNREFUSED)
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break;
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}
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// Write our message header.
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struct msghdr msg = {0};
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msg.msg_control = malloc(128);
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msg.msg_controllen = 128;
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// Write an SCM_RIGHTS message containing the output path.
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struct cmsghdr * hdr = CMSG_FIRSTHDR(&msg);
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hdr->cmsg_len = CMSG_LEN(sizeof(int));
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hdr->cmsg_level = SOL_SOCKET;
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hdr->cmsg_type = SCM_RIGHTS;
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int fd = open(getenv("out"), O_RDWR | O_CREAT, 0640);
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memcpy(CMSG_DATA(hdr), (void *) &fd, sizeof(int));
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msg.msg_controllen = CMSG_SPACE(sizeof(int));
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// Write a single null byte too.
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msg.msg_iov = (struct iovec *) malloc(sizeof(struct iovec));
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msg.msg_iov[0].iov_base = (void *) "";
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msg.msg_iov[0].iov_len = 1;
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msg.msg_iovlen = 1;
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// Send it to the othher side of this connection.
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res = sendmsg(sock, &msg, 0);
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if (res < 0)
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perror("sendmsg");
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int buf;
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// Wait for the server to close the socket, implying that it has
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// received the commmand.
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recv(sock, (void *) &buf, sizeof(int), 0);
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}
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