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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-t decisecs] [-a] ([-f fd] path [command ...] | path)")
static int
erecv_fd(int sock)
{
int fd;
char buf[1];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
char cms[CMSG_SPACE(sizeof(fd))];
iov.iov_base = buf;
iov.iov_len = 1;
memset(&msg, 0, sizeof(msg));
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = (caddr_t)cms;
msg.msg_controllen = sizeof(cms);
switch (recvmsg(sock, &msg, 0)) {
case -1:
eprintf("recvmsg:");
case 0:
eprintf("recvmsg: connection closed by peer");
default:
break;
}
cmsg = CMSG_FIRSTHDR(&msg);
memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
return fd;
}
int
main(int argc, char *argv[])
{
char buf[BUFSIZ];
struct sockaddr_un addr;
int abstract = 0;
int filedes = -1;
int tries = 11;
int sockfd, fd;
ssize_t n;
ARGBEGIN {
case 'a':
abstract = 1;
break;
case 'f':
filedes = etoi_flag('f', UARGF(), 0, INT_MAX);
break;
case 't':
tries = etoi_flag('t', UARGF(), 0, INT_MAX - 1) + 1;
break;
default:
usage();
} ARGEND;
if (argc < 1 || (filedes >= 0 && argc == 1))
usage();
if (filedes < 0)
filedes = STDIN_FILENO;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
if (strlen(argv[0]) + (size_t)(1 + abstract) > sizeof(addr.sun_path)) {
errno = ENAMETOOLONG;
eprintf("%s:", argv[0]);
}
strcpy(addr.sun_path + abstract, argv[0]);
argv++, argc--;
sockfd = socket(PF_UNIX, SOCK_SEQPACKET, 0);
if (sockfd < 0)
eprintf("socket PF_UNIX SOCK_SEQPACKET:");
retry:
if ((connect(sockfd, (const struct sockaddr *)&addr, (size_t)sizeof(addr))) < 0) {
if (--tries) {
usleep((useconds_t)100000L);
goto retry;
} else {
eprintf("bind %s%s%s:",
abstract ? "<abstract:" : "",
addr.sun_path + abstract,
abstract ? ">" : "");
}
}
fd = erecv_fd(sockfd);
close(sockfd);
if (argc) {
if (fd != filedes) {
if (dup2(fd, filedes) < 0)
eprintf("dup2 %i %i:", fd, filedes);
close(fd);
}
execvp(argv[0], argv);
eprintf("execvp %s:", argv[0]);
}
while ((n = read(fd, buf, sizeof(buf))) > 0)
ewriteall(STDOUT_FILENO, buf, (size_t)n, "<stdout>");
if (n < 0)
eprintf("read <received file>:");
return 0;
}
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