summaryrefslogtreecommitdiffstats
path: root/qemu/io/channel-command.c
diff options
context:
space:
mode:
Diffstat (limited to 'qemu/io/channel-command.c')
-rw-r--r--qemu/io/channel-command.c368
1 files changed, 0 insertions, 368 deletions
diff --git a/qemu/io/channel-command.c b/qemu/io/channel-command.c
deleted file mode 100644
index ad25313be..000000000
--- a/qemu/io/channel-command.c
+++ /dev/null
@@ -1,368 +0,0 @@
-/*
- * QEMU I/O channels external command driver
- *
- * Copyright (c) 2015 Red Hat, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- *
- */
-
-#include "qemu/osdep.h"
-#include "io/channel-command.h"
-#include "io/channel-watch.h"
-#include "qapi/error.h"
-#include "qemu/sockets.h"
-#include "trace.h"
-
-
-QIOChannelCommand *
-qio_channel_command_new_pid(int writefd,
- int readfd,
- pid_t pid)
-{
- QIOChannelCommand *ioc;
-
- ioc = QIO_CHANNEL_COMMAND(object_new(TYPE_QIO_CHANNEL_COMMAND));
-
- ioc->readfd = readfd;
- ioc->writefd = writefd;
- ioc->pid = pid;
-
- trace_qio_channel_command_new_pid(ioc, writefd, readfd, pid);
- return ioc;
-}
-
-
-#ifndef WIN32
-QIOChannelCommand *
-qio_channel_command_new_spawn(const char *const argv[],
- int flags,
- Error **errp)
-{
- pid_t pid = -1;
- int stdinfd[2] = { -1, -1 };
- int stdoutfd[2] = { -1, -1 };
- int devnull = -1;
- bool stdinnull = false, stdoutnull = false;
- QIOChannelCommand *ioc;
-
- flags = flags & O_ACCMODE;
-
- if (flags == O_RDONLY) {
- stdinnull = true;
- }
- if (flags == O_WRONLY) {
- stdoutnull = true;
- }
-
- if (stdinnull || stdoutnull) {
- devnull = open("/dev/null", O_RDWR);
- if (devnull < 0) {
- error_setg_errno(errp, errno,
- "Unable to open /dev/null");
- goto error;
- }
- }
-
- if ((!stdinnull && pipe(stdinfd) < 0) ||
- (!stdoutnull && pipe(stdoutfd) < 0)) {
- error_setg_errno(errp, errno,
- "Unable to open pipe");
- goto error;
- }
-
- pid = qemu_fork(errp);
- if (pid < 0) {
- goto error;
- }
-
- if (pid == 0) { /* child */
- dup2(stdinnull ? devnull : stdinfd[0], STDIN_FILENO);
- dup2(stdoutnull ? devnull : stdoutfd[1], STDOUT_FILENO);
- /* Leave stderr connected to qemu's stderr */
-
- if (!stdinnull) {
- close(stdinfd[0]);
- close(stdinfd[1]);
- }
- if (!stdoutnull) {
- close(stdoutfd[0]);
- close(stdoutfd[1]);
- }
- if (devnull != -1) {
- close(devnull);
- }
-
- execv(argv[0], (char * const *)argv);
- _exit(1);
- }
-
- if (!stdinnull) {
- close(stdinfd[0]);
- }
- if (!stdoutnull) {
- close(stdoutfd[1]);
- }
-
- ioc = qio_channel_command_new_pid(stdinnull ? devnull : stdinfd[1],
- stdoutnull ? devnull : stdoutfd[0],
- pid);
- trace_qio_channel_command_new_spawn(ioc, argv[0], flags);
- return ioc;
-
- error:
- if (devnull != -1) {
- close(devnull);
- }
- if (stdinfd[0] != -1) {
- close(stdinfd[0]);
- }
- if (stdinfd[1] != -1) {
- close(stdinfd[1]);
- }
- if (stdoutfd[0] != -1) {
- close(stdoutfd[0]);
- }
- if (stdoutfd[1] != -1) {
- close(stdoutfd[1]);
- }
- return NULL;
-}
-
-#else /* WIN32 */
-QIOChannelCommand *
-qio_channel_command_new_spawn(const char *const argv[],
- int flags,
- Error **errp)
-{
- error_setg_errno(errp, ENOSYS,
- "Command spawn not supported on this platform");
- return NULL;
-}
-#endif /* WIN32 */
-
-#ifndef WIN32
-static int qio_channel_command_abort(QIOChannelCommand *ioc,
- Error **errp)
-{
- pid_t ret;
- int status;
- int step = 0;
-
- /* See if intermediate process has exited; if not, try a nice
- * SIGTERM followed by a more severe SIGKILL.
- */
- rewait:
- trace_qio_channel_command_abort(ioc, ioc->pid);
- ret = waitpid(ioc->pid, &status, WNOHANG);
- trace_qio_channel_command_wait(ioc, ioc->pid, ret, status);
- if (ret == (pid_t)-1) {
- if (errno == EINTR) {
- goto rewait;
- } else {
- error_setg_errno(errp, errno,
- "Cannot wait on pid %llu",
- (unsigned long long)ioc->pid);
- return -1;
- }
- } else if (ret == 0) {
- if (step == 0) {
- kill(ioc->pid, SIGTERM);
- } else if (step == 1) {
- kill(ioc->pid, SIGKILL);
- } else {
- error_setg(errp,
- "Process %llu refused to die",
- (unsigned long long)ioc->pid);
- return -1;
- }
- step++;
- usleep(10 * 1000);
- goto rewait;
- }
-
- return 0;
-}
-#endif /* ! WIN32 */
-
-
-static void qio_channel_command_init(Object *obj)
-{
- QIOChannelCommand *ioc = QIO_CHANNEL_COMMAND(obj);
- ioc->readfd = -1;
- ioc->writefd = -1;
- ioc->pid = -1;
-}
-
-static void qio_channel_command_finalize(Object *obj)
-{
- QIOChannelCommand *ioc = QIO_CHANNEL_COMMAND(obj);
- if (ioc->readfd != -1) {
- close(ioc->readfd);
- }
- if (ioc->writefd != -1 &&
- ioc->writefd != ioc->readfd) {
- close(ioc->writefd);
- }
- ioc->writefd = ioc->readfd = -1;
- if (ioc->pid > 0) {
-#ifndef WIN32
- qio_channel_command_abort(ioc, NULL);
-#endif
- }
-}
-
-
-static ssize_t qio_channel_command_readv(QIOChannel *ioc,
- const struct iovec *iov,
- size_t niov,
- int **fds,
- size_t *nfds,
- Error **errp)
-{
- QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
- ssize_t ret;
-
- retry:
- ret = readv(cioc->readfd, iov, niov);
- if (ret < 0) {
- if (errno == EAGAIN) {
- return QIO_CHANNEL_ERR_BLOCK;
- }
- if (errno == EINTR) {
- goto retry;
- }
-
- error_setg_errno(errp, errno,
- "Unable to read from command");
- return -1;
- }
-
- return ret;
-}
-
-static ssize_t qio_channel_command_writev(QIOChannel *ioc,
- const struct iovec *iov,
- size_t niov,
- int *fds,
- size_t nfds,
- Error **errp)
-{
- QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
- ssize_t ret;
-
- retry:
- ret = writev(cioc->writefd, iov, niov);
- if (ret <= 0) {
- if (errno == EAGAIN) {
- return QIO_CHANNEL_ERR_BLOCK;
- }
- if (errno == EINTR) {
- goto retry;
- }
- error_setg_errno(errp, errno, "%s",
- "Unable to write to command");
- return -1;
- }
- return ret;
-}
-
-static int qio_channel_command_set_blocking(QIOChannel *ioc,
- bool enabled,
- Error **errp)
-{
- QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
-
- if (enabled) {
- qemu_set_block(cioc->writefd);
- qemu_set_block(cioc->readfd);
- } else {
- qemu_set_nonblock(cioc->writefd);
- qemu_set_nonblock(cioc->readfd);
- }
-
- return 0;
-}
-
-
-static int qio_channel_command_close(QIOChannel *ioc,
- Error **errp)
-{
- QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
- int rv = 0;
-
- /* We close FDs before killing, because that
- * gives a better chance of clean shutdown
- */
- if (cioc->readfd != -1 &&
- close(cioc->readfd) < 0) {
- rv = -1;
- }
- if (cioc->writefd != -1 &&
- cioc->writefd != cioc->readfd &&
- close(cioc->writefd) < 0) {
- rv = -1;
- }
- cioc->writefd = cioc->readfd = -1;
-#ifndef WIN32
- if (qio_channel_command_abort(cioc, errp) < 0) {
- return -1;
- }
-#endif
- if (rv < 0) {
- error_setg_errno(errp, errno, "%s",
- "Unable to close command");
- }
- return rv;
-}
-
-
-static GSource *qio_channel_command_create_watch(QIOChannel *ioc,
- GIOCondition condition)
-{
- QIOChannelCommand *cioc = QIO_CHANNEL_COMMAND(ioc);
- return qio_channel_create_fd_pair_watch(ioc,
- cioc->readfd,
- cioc->writefd,
- condition);
-}
-
-
-static void qio_channel_command_class_init(ObjectClass *klass,
- void *class_data G_GNUC_UNUSED)
-{
- QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
-
- ioc_klass->io_writev = qio_channel_command_writev;
- ioc_klass->io_readv = qio_channel_command_readv;
- ioc_klass->io_set_blocking = qio_channel_command_set_blocking;
- ioc_klass->io_close = qio_channel_command_close;
- ioc_klass->io_create_watch = qio_channel_command_create_watch;
-}
-
-static const TypeInfo qio_channel_command_info = {
- .parent = TYPE_QIO_CHANNEL,
- .name = TYPE_QIO_CHANNEL_COMMAND,
- .instance_size = sizeof(QIOChannelCommand),
- .instance_init = qio_channel_command_init,
- .instance_finalize = qio_channel_command_finalize,
- .class_init = qio_channel_command_class_init,
-};
-
-static void qio_channel_command_register_types(void)
-{
- type_register_static(&qio_channel_command_info);
-}
-
-type_init(qio_channel_command_register_types);