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	blind-from-named.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	---
	blind-from-named.c (2249B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include "common.h"
	3
	4 USAGE("[-t decisecs] [-a] ([-f fd] path [command ...] \| path)")
	5
	6 static int
	7 erecv_fd(int sock)
	8 {
	9 int fd;
	10 char buf[1];
	11 struct iovec iov;
	12 struct msghdr msg;
	13 struct cmsghdr *cmsg;
	14 char cms[CMSG_SPACE(sizeof(fd))];
	15
	16 iov.iov_base = buf;
	17 iov.iov_len = 1;
	18
	19 memset(&msg, 0, sizeof(msg));
	20 msg.msg_name = 0;
	21 msg.msg_namelen = 0;
	22 msg.msg_iov = &iov;
	23 msg.msg_iovlen = 1;
	24
	25 msg.msg_control = (caddr_t)cms;
	26 msg.msg_controllen = sizeof(cms);
	27
	28 switch (recvmsg(sock, &msg, 0)) {
	29 case -1:
	30 eprintf("recvmsg:");
	31 case 0:
	32 eprintf("recvmsg: connection closed by peer");
	33 default:
	34 break;
	35 }
	36
	37 cmsg = CMSG_FIRSTHDR(&msg);
	38 memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
	39 return fd;
	40 }
	41
	42 int
	43 main(int argc, char *argv[])
	44 {
	45 char buf[BUFSIZ];
	46 struct sockaddr_un addr;
	47 int abstract = 0;
	48 int filedes = -1;
	49 int tries = 11;
	50 int sockfd, fd;
	51 size_t n;
	52
	53 ARGBEGIN {
	54 case 'a':
	55 abstract = 1;
	56 break;
	57 case 'f':
	58 filedes = etoi_flag('f', UARGF(), 0, INT_MAX);
	59 break;
	60 case 't':
	61 tries = etoi_flag('t', UARGF(), 0, INT_MAX - 1) + 1;
	62 break;
	63 default:
	64 usage();
	65 } ARGEND;
	66 if (argc < 1 \|\| (filedes >= 0 && argc == 1))
	67 usage();
	68 if (filedes < 0)
	69 filedes = STDIN_FILENO;
	70
	71 memset(&addr, 0, sizeof(addr));
	72 addr.sun_family = AF_UNIX;
	73 if (strlen(argv[0]) + (size_t)(1 + abstract) > sizeof(addr.sun_p…
	74 errno = ENAMETOOLONG;
	75 eprintf("%s:", argv[0]);
	76 }
	77 strcpy(addr.sun_path + abstract, argv[0]);
	78 argv++, argc--;
	79
	80 sockfd = socket(PF_UNIX, SOCK_SEQPACKET, 0);
	81 if (sockfd < 0)
	82 eprintf("socket PF_UNIX SOCK_SEQPACKET:");
	83
	84 retry:
	85 if ((connect(sockfd, (const struct sockaddr *)&addr, (size_t)siz…
	86 if (--tries) {
	87 usleep((useconds_t)100000L);
	88 goto retry;
	89 } else {
	90 eprintf("bind %s%s%s:",
	91 abstract ? "<abstract:" : "",
	92 addr.sun_path + abstract,
	93 abstract ? ">" : "");
	94 }
	95 }
	96
	97 fd = erecv_fd(sockfd);
	98 close(sockfd);
	99
	100 if (argc) {
	101 if (fd != filedes) {
	102 if (dup2(fd, filedes) < 0)
	103 eprintf("dup2 %i %i:", fd, filedes);
	104 close(fd);
	105 }
	106 execvp(argv[0], argv);
	107 eprintf("execvp %s:", argv[0]);
	108 }
	109
	110 while ((n = eread(fd, buf, sizeof(buf), "<received file>")))
	111 ewriteall(STDOUT_FILENO, buf, n, "<stdout>");
	112 return 0;
	113 }