ssize_t pa_iochannel_write(pa_iochannel*io, const void*data, size_t l) {
ssize_t r;
pa_assert(io);
pa_assert(data);
pa_assert(l);
pa_assert(io->ofd >= 0);
r = pa_write(io->ofd, data, l, &io->ofd_type);
if ((size_t) r == l)
return r; /* Fast path - we almost always successfully write everything */
if (r < 0) {
if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
r = 0;
else
return r;
}
/* Partial write - let's get a notification when we can write more */
io->writable = io->hungup = false;
enable_events(io);
return r;
}
static void callback(pa_mainloop_api* m, pa_io_event *e, int fd, pa_io_event_flags_t f, void *userdata) {
pa_iochannel *io = userdata;
bool changed = false;
pa_assert(m);
pa_assert(e);
pa_assert(fd >= 0);
pa_assert(userdata);
if ((f & (PA_IO_EVENT_HANGUP|PA_IO_EVENT_ERROR)) && !io->hungup) {
io->hungup = true;
changed = true;
}
if ((f & PA_IO_EVENT_INPUT) && !io->readable) {
io->readable = true;
changed = true;
pa_assert(e == io->input_event);
}
if ((f & PA_IO_EVENT_OUTPUT) && !io->writable) {
io->writable = true;
changed = true;
pa_assert(e == io->output_event);
}
if (changed) {
enable_events(io);
if (io->callback)
io->callback(io, io->userdata);
}
}
int create_live_local_session(char **session_path, char **session_name, int print)
{
int ret;
char *name;
int sudo = 0;
ret = check_requirements(&sudo);
name = random_session_name();
if (!name) {
ret = -1;
goto end;
}
ret = check_session_name(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = live_local_session(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = enable_events(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = add_contexts(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = start(name, sudo, 0, print);
if (ret < 0) {
goto end_free;
}
if (session_path)
*session_path = live_path(name);
if (session_name) {
*session_name = name;
goto end;
}
end_free:
free(name);
end:
return ret;
}
/* For more details on FD passing, check the cmsg(3) manpage
* and IETF RFC #2292: "Advanced Sockets API for IPv6" */
ssize_t pa_iochannel_write_with_fds(pa_iochannel*io, const void*data, size_t l, int nfd, const int *fds) {
ssize_t r;
int *msgdata;
struct msghdr mh;
struct iovec iov;
union {
struct cmsghdr hdr;
uint8_t data[CMSG_SPACE(sizeof(int) * MAX_ANCIL_DATA_FDS)];
} cmsg;
pa_assert(io);
pa_assert(data);
pa_assert(l);
pa_assert(io->ofd >= 0);
pa_assert(fds);
pa_assert(nfd > 0);
pa_assert(nfd <= MAX_ANCIL_DATA_FDS);
pa_zero(iov);
iov.iov_base = (void*) data;
iov.iov_len = l;
pa_zero(cmsg);
cmsg.hdr.cmsg_level = SOL_SOCKET;
cmsg.hdr.cmsg_type = SCM_RIGHTS;
msgdata = (int*) CMSG_DATA(&cmsg.hdr);
memcpy(msgdata, fds, nfd * sizeof(int));
cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(int) * nfd);
pa_zero(mh);
mh.msg_iov = &iov;
mh.msg_iovlen = 1;
mh.msg_control = &cmsg;
/* If we followed the example on the cmsg man page, we'd use
* sizeof(cmsg.data) here, but if nfd < MAX_ANCIL_DATA_FDS, then the data
* buffer is larger than needed, and the kernel doesn't like it if we set
* msg_controllen to a larger than necessary value. The commit message for
* commit 451d1d6762 contains a longer explanation. */
mh.msg_controllen = CMSG_SPACE(sizeof(int) * nfd);
if ((r = sendmsg(io->ofd, &mh, MSG_NOSIGNAL)) >= 0) {
io->writable = io->hungup = false;
enable_events(io);
}
return r;
}
ssize_t pa_iochannel_write_with_creds(pa_iochannel*io, const void*data, size_t l, const pa_creds *ucred) {
ssize_t r;
struct msghdr mh;
struct iovec iov;
union {
struct cmsghdr hdr;
uint8_t data[CMSG_SPACE(sizeof(struct ucred))];
} cmsg;
struct ucred *u;
pa_assert(io);
pa_assert(data);
pa_assert(l);
pa_assert(io->ofd >= 0);
pa_zero(iov);
iov.iov_base = (void*) data;
iov.iov_len = l;
pa_zero(cmsg);
cmsg.hdr.cmsg_len = CMSG_LEN(sizeof(struct ucred));
cmsg.hdr.cmsg_level = SOL_SOCKET;
cmsg.hdr.cmsg_type = SCM_CREDENTIALS;
u = (struct ucred*) CMSG_DATA(&cmsg.hdr);
u->pid = getpid();
if (ucred) {
u->uid = ucred->uid;
u->gid = ucred->gid;
} else {
u->uid = getuid();
u->gid = getgid();
}
pa_zero(mh);
mh.msg_iov = &iov;
mh.msg_iovlen = 1;
mh.msg_control = &cmsg;
mh.msg_controllen = sizeof(cmsg);
if ((r = sendmsg(io->ofd, &mh, MSG_NOSIGNAL)) >= 0) {
io->writable = io->hungup = false;
enable_events(io);
}
return r;
}
ssize_t pa_iochannel_read(pa_iochannel*io, void*data, size_t l) {
ssize_t r;
pa_assert(io);
pa_assert(data);
pa_assert(io->ifd >= 0);
if ((r = pa_read(io->ifd, data, l, &io->ifd_type)) >= 0) {
/* We also reset the hangup flag here to ensure that another
* IO callback is triggered so that we will again call into
* user code */
io->readable = io->hungup = false;
enable_events(io);
}
return r;
}
int create_local_session()
{
int ret;
char *name;
int sudo = 0;
ret = check_requirements(&sudo);
name = random_session_name();
if (!name) {
ret = -1;
goto end;
}
ret = check_session_name(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = local_session(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = enable_events(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = add_contexts(name, sudo);
if (ret < 0) {
goto end_free;
}
ret = start(name, sudo, 1, 1);
if (ret < 0) {
goto end_free;
}
end_free:
free(name);
end:
return ret;
}
pa_iochannel* pa_iochannel_new(pa_mainloop_api*m, int ifd, int ofd) {
pa_iochannel *io;
pa_assert(m);
pa_assert(ifd >= 0 || ofd >= 0);
io = pa_xnew0(pa_iochannel, 1);
io->ifd = ifd;
io->ofd = ofd;
io->mainloop = m;
if (io->ifd >= 0)
pa_make_fd_nonblock(io->ifd);
if (io->ofd >= 0 && io->ofd != io->ifd)
pa_make_fd_nonblock(io->ofd);
enable_events(io);
return io;
}
scroll_bar::
scroll_bar(
drawable_window& w,
bar_orientation orientation
) :
drawable(w),
width_(16),
b1(w,arrow_button::UP),
b2(w,arrow_button::DOWN),
slider(w,*this,&scroll_bar::on_slider_drag),
ori(orientation),
top_filler(w,*this,&scroll_bar::top_filler_down,&scroll_bar::top_filler_up),
bottom_filler(w,*this,&scroll_bar::bottom_filler_down,&scroll_bar::bottom_filler_up),
pos(0),
max_pos(0),
js(10),
b1_timer(*this,&scroll_bar::b1_down_t),
b2_timer(*this,&scroll_bar::b2_down_t),
top_filler_timer(*this,&scroll_bar::top_filler_down_t),
bottom_filler_timer(*this,&scroll_bar::bottom_filler_down_t)
{
if (ori == HORIZONTAL)
{
b1.set_direction(arrow_button::LEFT);
b2.set_direction(arrow_button::RIGHT);
}
// don't show the slider when there is no place it can move.
slider.hide();
set_length(100);
b1.set_button_down_handler(*this,&scroll_bar::b1_down);
b2.set_button_down_handler(*this,&scroll_bar::b2_down);
b1.set_button_up_handler(*this,&scroll_bar::b1_up);
b2.set_button_up_handler(*this,&scroll_bar::b2_up);
b1.disable();
b2.disable();
enable_events();
}
/*
* Add event to trace session
*/
int cmd_enable_events(int argc, const char **argv)
{
int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
static poptContext pc;
char *session_name = NULL;
const char *leftover = NULL;
int event_type = -1;
pc = poptGetContext(NULL, argc, argv, long_options, 0);
poptReadDefaultConfig(pc, 0);
/* Default event type */
opt_event_type = LTTNG_EVENT_ALL;
while ((opt = poptGetNextOpt(pc)) != -1) {
switch (opt) {
case OPT_HELP:
SHOW_HELP();
goto end;
case OPT_TRACEPOINT:
opt_event_type = LTTNG_EVENT_TRACEPOINT;
break;
case OPT_PROBE:
opt_event_type = LTTNG_EVENT_PROBE;
break;
case OPT_USERSPACE_PROBE:
opt_event_type = LTTNG_EVENT_USERSPACE_PROBE;
break;
case OPT_FUNCTION:
opt_event_type = LTTNG_EVENT_FUNCTION;
break;
case OPT_SYSCALL:
opt_event_type = LTTNG_EVENT_SYSCALL;
break;
case OPT_USERSPACE:
opt_userspace = 1;
break;
case OPT_LOGLEVEL:
opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
opt_loglevel = poptGetOptArg(pc);
break;
case OPT_LOGLEVEL_ONLY:
opt_loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
opt_loglevel = poptGetOptArg(pc);
break;
case OPT_LIST_OPTIONS:
list_cmd_options(stdout, long_options);
goto end;
case OPT_FILTER:
break;
case OPT_EXCLUDE:
break;
default:
ret = CMD_UNDEFINED;
goto end;
}
/* Validate event type. Multiple event type are not supported. */
if (event_type == -1) {
event_type = opt_event_type;
} else {
if (event_type != opt_event_type) {
ERR("Multiple event type not supported.");
ret = CMD_ERROR;
goto end;
}
}
}
ret = print_missing_or_multiple_domains(
opt_kernel + opt_userspace + opt_jul + opt_log4j + opt_python);
if (ret) {
ret = CMD_ERROR;
goto end;
}
/* Mi check */
if (lttng_opt_mi) {
writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
if (!writer) {
ret = -LTTNG_ERR_NOMEM;
goto end;
}
/* Open command element */
ret = mi_lttng_writer_command_open(writer,
mi_lttng_element_command_enable_event);
if (ret) {
ret = CMD_ERROR;
goto end;
}
/* Open output element */
ret = mi_lttng_writer_open_element(writer,
mi_lttng_element_command_output);
if (ret) {
ret = CMD_ERROR;
goto end;
}
}
opt_event_list = (char*) poptGetArg(pc);
if (opt_event_list == NULL && opt_enable_all == 0) {
ERR("Missing event name(s).\n");
ret = CMD_ERROR;
goto end;
}
leftover = poptGetArg(pc);
if (leftover) {
ERR("Unknown argument: %s", leftover);
ret = CMD_ERROR;
goto end;
}
if (!opt_session_name) {
session_name = get_session_name();
if (session_name == NULL) {
command_ret = CMD_ERROR;
success = 0;
goto mi_closing;
}
} else {
session_name = opt_session_name;
}
command_ret = enable_events(session_name);
if (command_ret) {
success = 0;
goto mi_closing;
}
mi_closing:
/* Mi closing */
if (lttng_opt_mi) {
/* Close output element */
ret = mi_lttng_writer_close_element(writer);
if (ret) {
ret = CMD_ERROR;
goto end;
}
ret = mi_lttng_writer_write_element_bool(writer,
mi_lttng_element_command_success, success);
if (ret) {
ret = CMD_ERROR;
goto end;
}
/* Command element close */
ret = mi_lttng_writer_command_close(writer);
if (ret) {
ret = CMD_ERROR;
goto end;
}
}
end:
/* Mi clean-up */
if (writer && mi_lttng_writer_destroy(writer)) {
/* Preserve original error code */
ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
}
if (opt_session_name == NULL) {
free(session_name);
}
/* Overwrite ret if an error occurred in enable_events */
ret = command_ret ? command_ret : ret;
poptFreeContext(pc);
return ret;
}
ssize_t pa_iochannel_read_with_ancil_data(pa_iochannel*io, void*data, size_t l, pa_cmsg_ancil_data *ancil_data) {
ssize_t r;
struct msghdr mh;
struct iovec iov;
union {
struct cmsghdr hdr;
uint8_t data[CMSG_SPACE(sizeof(struct ucred)) + CMSG_SPACE(sizeof(int) * MAX_ANCIL_DATA_FDS)];
} cmsg;
pa_assert(io);
pa_assert(data);
pa_assert(l);
pa_assert(io->ifd >= 0);
pa_assert(ancil_data);
if (io->ifd_type > 0) {
ancil_data->creds_valid = false;
ancil_data->nfd = 0;
return pa_iochannel_read(io, data, l);
}
iov.iov_base = data;
iov.iov_len = l;
pa_zero(mh);
mh.msg_iov = &iov;
mh.msg_iovlen = 1;
mh.msg_control = &cmsg;
mh.msg_controllen = sizeof(cmsg);
if ((r = recvmsg(io->ifd, &mh, 0)) >= 0) {
struct cmsghdr *cmh;
ancil_data->creds_valid = false;
ancil_data->nfd = 0;
for (cmh = CMSG_FIRSTHDR(&mh); cmh; cmh = CMSG_NXTHDR(&mh, cmh)) {
if (cmh->cmsg_level != SOL_SOCKET)
continue;
if (cmh->cmsg_type == SCM_CREDENTIALS) {
struct ucred u;
pa_assert(cmh->cmsg_len == CMSG_LEN(sizeof(struct ucred)));
memcpy(&u, CMSG_DATA(cmh), sizeof(struct ucred));
ancil_data->creds.gid = u.gid;
ancil_data->creds.uid = u.uid;
ancil_data->creds_valid = true;
}
else if (cmh->cmsg_type == SCM_RIGHTS) {
int nfd = (cmh->cmsg_len - CMSG_LEN(0)) / sizeof(int);
if (nfd > MAX_ANCIL_DATA_FDS) {
int i;
pa_log("Trying to receive too many file descriptors!");
for (i = 0; i < nfd; i++)
pa_close(((int*) CMSG_DATA(cmh))[i]);
continue;
}
memcpy(ancil_data->fds, CMSG_DATA(cmh), nfd * sizeof(int));
ancil_data->nfd = nfd;
ancil_data->close_fds_on_cleanup = true;
}
}
io->readable = io->hungup = false;
enable_events(io);
}
if (r == -1 && errno == ENOTSOCK) {
io->ifd_type = 1;
return pa_iochannel_read_with_ancil_data(io, data, l, ancil_data);
}
return r;
}
