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h_mdserv.c
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t_md.sh
(2.26 KB)
Editing: h_mdserv.c
/* $NetBSD: h_mdserv.c,v 1.4 2011/02/10 13:29:02 pooka Exp $ */ #include <sys/types.h> #include <sys/mman.h> #include <sys/ioctl.h> #include <dev/md.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <rump/rump.h> #include <rump/rump_syscalls.h> #define MDSIZE (1024*1024) #define REQUIRE(a, msg) if ((a) != 0) err(1, msg); static void * prober(void *arg) { int fd, error; char buf[4]; ssize_t n; fd = rump_sys_open(arg, O_RDONLY); for (;;) { n = rump_sys_read(fd, buf, sizeof(buf)); switch (n) { case 4: error = 0; goto out; case -1: if (errno == ENXIO) { usleep(1000); continue; } /* FALLTHROUGH */ default: error = EPIPE; goto out; } } out: error = rump_daemonize_done(error); REQUIRE(error, "rump_daemonize_done"); if (error) exit(1); return NULL; } int main(int argc, char *argv[]) { pthread_t pt; struct md_conf md; int fd, error; if (argc != 2) exit(1); md.md_addr = calloc(1, MDSIZE); md.md_size = MDSIZE; md.md_type = MD_UMEM_SERVER; error = rump_daemonize_begin(); REQUIRE(error, "rump_daemonize_begin"); error = rump_init(); REQUIRE(error, "rump_init"); error = rump_init_server("unix://commsock"); REQUIRE(error, "init server"); if ((fd = rump_sys_open(argv[1], O_RDWR)) == -1) err(1, "open"); /* * Now, configuring the md driver also causes our process * to start acting as the worker for the md. Splitting it * into two steps in the driver is not easy, since md is * supposed to be unconfigured when the process dies * (process may exit between calling ioctl1 and ioctl2). * So, start a probe thread which attempts to read the md * and declares the md as configured when the read is * succesful. */ error = pthread_create(&pt, NULL, prober, argv[1]); REQUIRE(error, "pthread_create"); pthread_detach(pt); if (rump_sys_ioctl(fd, MD_SETCONF, &md) == -1) { rump_daemonize_done(errno); exit(1); } return 0; }
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