blind-to-named.c - blind - suckless command-line video editing utility
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       ---
       blind-to-named.c (1722B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include "common.h"
            3 
            4 USAGE("[-a] path")
            5 
            6 static void
            7 esend_fd(int sock, int fd)
            8 {
            9         char buf[1];
           10         struct iovec iov;
           11         struct msghdr msg;
           12         struct cmsghdr *cmsg;
           13         char cms[CMSG_SPACE(sizeof(fd))];
           14 
           15         buf[0] = 0;
           16         iov.iov_base = buf;
           17         iov.iov_len = 1;
           18 
           19         memset(&msg, 0, sizeof(msg));
           20         msg.msg_iov = &iov;
           21         msg.msg_iovlen = 1;
           22         msg.msg_control = (caddr_t)cms;
           23         msg.msg_controllen = CMSG_LEN(sizeof(fd));
           24 
           25         cmsg = CMSG_FIRSTHDR(&msg);
           26         cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
           27         cmsg->cmsg_level = SOL_SOCKET;
           28         cmsg->cmsg_type = SCM_RIGHTS;
           29         memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
           30 
           31         if (sendmsg(sock, &msg, 0) != (ssize_t)iov.iov_len)
           32                 eprintf("sendmsg:");
           33 }
           34 
           35 int
           36 main(int argc, char *argv[])
           37 {
           38         struct sockaddr_un addr;
           39         int abstract = 0;
           40         int serverfd, connfd;
           41 
           42         ARGBEGIN {
           43         case 'a':
           44                 abstract = 1;
           45                 break;
           46         default:
           47                 usage();
           48         } ARGEND;
           49         if (argc != 1)
           50                 usage();
           51 
           52         memset(&addr, 0, sizeof(addr));
           53         addr.sun_family = AF_UNIX;
           54         if (strlen(argv[0]) + (size_t)(1 + abstract) > sizeof(addr.sun_path)) {
           55                 errno = ENAMETOOLONG;
           56                 eprintf("%s:", argv[0]);
           57         }
           58         strcpy(addr.sun_path + abstract, argv[0]);
           59 
           60         serverfd = socket(PF_UNIX, SOCK_SEQPACKET, 0);
           61         if (serverfd < 0)
           62                 eprintf("socket PF_UNIX SOCK_SEQPACKET:");
           63 
           64         if (bind(serverfd, (const struct sockaddr *)&addr, (size_t)sizeof(addr)) < 0)
           65                 eprintf("bind %s%s%s:",
           66                         abstract ? "<abstract:" : "",
           67                         addr.sun_path + abstract,
           68                         abstract ? ">" : "");
           69 
           70         if (listen(serverfd, 1) < 0)
           71                 eprintf("listen:");
           72 
           73         connfd = accept(serverfd, NULL, NULL);
           74         if (connfd < 0)
           75                 eprintf("accept:");
           76 
           77         if (*addr.sun_path)
           78                 unlink(addr.sun_path);
           79         close(serverfd);
           80 
           81         esend_fd(connfd, STDIN_FILENO);
           82         close(connfd);
           83         return 0;
           84 }