xen-vtx-unstable

annotate tools/xenstore/fake_libxc.c @ 6754:f804b28871ba

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author cl349@firebug.cl.cam.ac.uk
date Tue Sep 13 09:11:58 2005 +0000 (2005-09-13)
parents f1bb1316b26f d44caae57112
children 4d899a738d59 8ca0f98ba8e2
rev   line source
cl349@5357 1 /*
cl349@5357 2 Fake libxc which doesn't require hypervisor but talks to xs_test.
cl349@5357 3 Copyright (C) 2005 Rusty Russell IBM Corporation
cl349@5357 4
cl349@5357 5 This program is free software; you can redistribute it and/or modify
cl349@5357 6 it under the terms of the GNU General Public License as published by
cl349@5357 7 the Free Software Foundation; either version 2 of the License, or
cl349@5357 8 (at your option) any later version.
cl349@5357 9
cl349@5357 10 This program is distributed in the hope that it will be useful,
cl349@5357 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
cl349@5357 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
cl349@5357 13 GNU General Public License for more details.
cl349@5357 14
cl349@5357 15 You should have received a copy of the GNU General Public License
cl349@5357 16 along with this program; if not, write to the Free Software
cl349@5357 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
cl349@5357 18 */
cl349@5357 19
cl349@5357 20 #include <stdio.h>
cl349@5357 21 #include <stdlib.h>
cl349@5357 22 #include <sys/types.h>
cl349@5357 23 #include <sys/stat.h>
cl349@5357 24 #include <fcntl.h>
cl349@5357 25 #include <sys/mman.h>
cl349@5357 26 #include <unistd.h>
cl349@5357 27 #include <assert.h>
cl349@5357 28 #include <signal.h>
cl349@5357 29 #include "utils.h"
cl349@5357 30 #include "xenstored_core.h"
cl349@5357 31 #include "xenstored_domain.h"
cl349@5357 32 #include "xenstored_test.h"
cl349@5357 33
cl349@5357 34 static int sigfd;
cl349@5357 35 static int xs_test_pid;
cl349@5357 36 static u16 port;
cl349@5357 37
cl349@5357 38 /* The event channel maps to a signal, shared page to an mmapped file. */
cl349@5357 39 int xc_evtchn_send(int xc_handle __attribute__((unused)), int local_port)
cl349@5357 40 {
cl349@5357 41 assert(local_port == port);
cl349@5357 42 if (kill(xs_test_pid, SIGUSR2) != 0)
cl349@5357 43 barf_perror("fake event channel failed");
cl349@5357 44 return 0;
cl349@5357 45 }
cl349@5357 46
cl349@5357 47 void *xc_map_foreign_range(int xc_handle, u32 dom __attribute__((unused)),
cl349@5357 48 int size, int prot,
cl349@5357 49 unsigned long mfn __attribute__((unused)))
cl349@5357 50 {
cl349@5357 51 void *ret;
cl349@5357 52
cl349@5357 53 ret = mmap(NULL, size, prot, MAP_SHARED, xc_handle, 0);
cl349@5357 54 if (ret == MAP_FAILED)
cl349@5357 55 return NULL;
cl349@5357 56
cl349@5357 57 /* xs_test tells us pid and port by putting it in buffer, we reply. */
cl349@5357 58 xs_test_pid = *(int *)(ret + 32);
cl349@5357 59 port = *(int *)(ret + 36);
cl349@5357 60 *(int *)(ret + 32) = getpid();
cl349@5357 61 return ret;
cl349@5357 62 }
cl349@5357 63
cl349@5357 64 int xc_interface_open(void)
cl349@5357 65 {
cl349@5357 66 int fd;
cl349@5357 67 char page[getpagesize()];
cl349@5357 68
cl349@5357 69 fd = open("/tmp/xcmap", O_RDWR|O_CREAT|O_TRUNC, 0600);
cl349@5357 70 if (fd < 0)
cl349@5357 71 return fd;
cl349@5357 72
cl349@5357 73 memset(page, 0, sizeof(page));
kaf24@5423 74 if (!xs_write_all(fd, page, sizeof(page)))
cl349@5357 75 barf_perror("Failed to write /tmp/xcmap page");
cl349@5357 76
cl349@5357 77 return fd;
cl349@5357 78 }
cl349@5357 79
cl349@5357 80 int xc_interface_close(int xc_handle)
cl349@5357 81 {
cl349@5357 82 close(xc_handle);
cl349@5357 83 return 0;
cl349@5357 84 }
cl349@5357 85
cl349@6752 86 int xc_domain_getinfo(int xc_handle __attribute__((unused)),
cl349@6752 87 u32 first_domid, unsigned int max_doms,
cl349@6752 88 xc_dominfo_t *info)
cl349@6752 89 {
cl349@6752 90 assert(max_doms == 1);
cl349@6752 91 info->domid = first_domid;
cl349@6752 92
cl349@6752 93 info->dying = 0;
cl349@6752 94 info->shutdown = 0;
cl349@6752 95 info->paused = 0;
cl349@6752 96 info->blocked = 0;
cl349@6752 97 info->running = 1;
cl349@6752 98
cl349@6752 99 info->shutdown_reason = 0;
cl349@6752 100
cl349@6752 101 if ( info->shutdown && (info->shutdown_reason == SHUTDOWN_crash) )
cl349@6752 102 {
cl349@6752 103 info->shutdown = 0;
cl349@6752 104 info->crashed = 1;
cl349@6752 105 }
cl349@6752 106
cl349@6752 107 return 1;
cl349@6752 108 }
cl349@6752 109
cl349@6752 110 int xc_evtchn_bind_virq(int xc_handle __attribute__((unused)),
cl349@6752 111 int virq __attribute__((unused)),
cl349@6752 112 int *port)
cl349@6752 113 {
cl349@6752 114 if (port)
cl349@6752 115 *port = 0;
cl349@6752 116 return 0;
cl349@6752 117 }
cl349@6752 118
cl349@5357 119 static void send_to_fd(int signo __attribute__((unused)))
cl349@5357 120 {
cl349@5357 121 int saved_errno = errno;
cl349@5357 122 write(sigfd, &port, sizeof(port));
cl349@5357 123 errno = saved_errno;
cl349@5357 124 }
cl349@5357 125
cl349@5357 126 void fake_block_events(void)
cl349@5357 127 {
cl349@5357 128 signal(SIGUSR2, SIG_IGN);
cl349@5357 129 }
cl349@5357 130
cl349@5357 131 void fake_ack_event(void)
cl349@5357 132 {
cl349@5357 133 signal(SIGUSR2, send_to_fd);
cl349@5357 134 }
cl349@5357 135
cl349@5357 136 int fake_open_eventchn(void)
cl349@5357 137 {
cl349@5357 138 int fds[2];
cl349@5357 139
cl349@5357 140 if (pipe(fds) != 0)
cl349@5357 141 return -1;
cl349@5357 142
cl349@5357 143 if (signal(SIGUSR2, send_to_fd) == SIG_ERR) {
cl349@5357 144 int saved_errno = errno;
cl349@5357 145 close(fds[0]);
cl349@5357 146 close(fds[1]);
cl349@5357 147 errno = saved_errno;
cl349@5357 148 return -1;
cl349@5357 149 }
cl349@5357 150 sigfd = fds[1];
cl349@5357 151 return fds[0];
cl349@5357 152 }