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qemu/cmd.c
Paolo Bonzini a5a5238ee4 qemu-io: use main_loop_wait 
This will let timers run during aio_read and aio_write commands,
though not during synchronous commands.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-04-19 16:29:33 +02:00

607 lines
12 KiB
C
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/*
* Copyright (c) 2003-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/time.h>
#include <getopt.h>
#include "cmd.h"
#include "qemu-aio.h"
#include "main-loop.h"
#define _(x) x /* not gettext support yet */
/* from libxcmd/command.c */
cmdinfo_t *cmdtab;
int ncmds;
static argsfunc_t args_func;
static checkfunc_t check_func;
static int ncmdline;
static char **cmdline;
static int
compare(const void *a, const void *b)
{
return strcmp(((const cmdinfo_t *)a)->name,
((const cmdinfo_t *)b)->name);
}
void add_command(const cmdinfo_t *ci)
{
cmdtab = g_realloc((void *)cmdtab, ++ncmds * sizeof(*cmdtab));
cmdtab[ncmds - 1] = *ci;
qsort(cmdtab, ncmds, sizeof(*cmdtab), compare);
}
static int
check_command(
const cmdinfo_t *ci)
{
if (check_func)
return check_func(ci);
return 1;
}
void
add_check_command(
checkfunc_t cf)
{
check_func = cf;
}
int
command_usage(
const cmdinfo_t *ci)
{
printf("%s %s -- %s\n", ci->name, ci->args, ci->oneline);
return 0;
}
int
command(
const cmdinfo_t *ct,
int argc,
char **argv)
{
char *cmd = argv[0];
if (!check_command(ct))
return 0;
if (argc-1 < ct->argmin || (ct->argmax != -1 && argc-1 > ct->argmax)) {
if (ct->argmax == -1)
fprintf(stderr,
_("bad argument count %d to %s, expected at least %d arguments\n"),
argc-1, cmd, ct->argmin);
else if (ct->argmin == ct->argmax)
fprintf(stderr,
_("bad argument count %d to %s, expected %d arguments\n"),
argc-1, cmd, ct->argmin);
else
fprintf(stderr,
_("bad argument count %d to %s, expected between %d and %d arguments\n"),
argc-1, cmd, ct->argmin, ct->argmax);
return 0;
}
optind = 0;
return ct->cfunc(argc, argv);
}
const cmdinfo_t *
find_command(
const char *cmd)
{
cmdinfo_t *ct;
for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++) {
if (strcmp(ct->name, cmd) == 0 ||
(ct->altname && strcmp(ct->altname, cmd) == 0))
return (const cmdinfo_t *)ct;
}
return NULL;
}
void add_user_command(char *optarg)
{
cmdline = g_realloc(cmdline, ++ncmdline * sizeof(char *));
cmdline[ncmdline-1] = optarg;
}
static int
args_command(
int index)
{
if (args_func)
return args_func(index);
return 0;
}
void
add_args_command(
argsfunc_t af)
{
args_func = af;
}
static void prep_fetchline(void *opaque)
{
int *fetchable = opaque;
qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
*fetchable= 1;
}
static char *get_prompt(void);
void command_loop(void)
{
int c, i, j = 0, done = 0, fetchable = 0, prompted = 0;
char *input;
char **v;
const cmdinfo_t *ct;
for (i = 0; !done && i < ncmdline; i++) {
input = strdup(cmdline[i]);
if (!input) {
fprintf(stderr, _("cannot strdup command '%s': %s\n"),
cmdline[i], strerror(errno));
exit(1);
}
v = breakline(input, &c);
if (c) {
ct = find_command(v[0]);
if (ct) {
if (ct->flags & CMD_FLAG_GLOBAL) {
done = command(ct, c, v);
} else {
j = 0;
while (!done && (j = args_command(j))) {
done = command(ct, c, v);
}
}
} else {
fprintf(stderr, _("command \"%s\" not found\n"), v[0]);
}
}
doneline(input, v);
}
if (cmdline) {
g_free(cmdline);
return;
}
while (!done) {
if (!prompted) {
printf("%s", get_prompt());
fflush(stdout);
qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable);
prompted = 1;
}
main_loop_wait(false);
if (!fetchable) {
continue;
}
input = fetchline();
if (input == NULL) {
break;
}
v = breakline(input, &c);
if (c) {
ct = find_command(v[0]);
if (ct) {
done = command(ct, c, v);
} else {
fprintf(stderr, _("command \"%s\" not found\n"), v[0]);
}
}
doneline(input, v);
prompted = 0;
fetchable = 0;
}
qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
}
/* from libxcmd/input.c */
#if defined(ENABLE_READLINE)
# include <readline/history.h>
# include <readline/readline.h>
#elif defined(ENABLE_EDITLINE)
# include <histedit.h>
#endif
static char *
get_prompt(void)
{
static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
if (!prompt[0])
snprintf(prompt, sizeof(prompt), "%s> ", progname);
return prompt;
}
#if defined(ENABLE_READLINE)
char *
fetchline(void)
{
char *line;
line = readline(get_prompt());
if (line && *line)
add_history(line);
return line;
}
#elif defined(ENABLE_EDITLINE)
static char *el_get_prompt(EditLine *e) { return get_prompt(); }
char *
fetchline(void)
{
static EditLine *el;
static History *hist;
HistEvent hevent;
char *line;
int count;
if (!el) {
hist = history_init();
history(hist, &hevent, H_SETSIZE, 100);
el = el_init(progname, stdin, stdout, stderr);
el_source(el, NULL);
el_set(el, EL_SIGNAL, 1);
el_set(el, EL_PROMPT, el_get_prompt);
el_set(el, EL_HIST, history, (const char *)hist);
}
line = strdup(el_gets(el, &count));
if (line) {
if (count > 0)
line[count-1] = '\0';
if (*line)
history(hist, &hevent, H_ENTER, line);
}
return line;
}
#else
# define MAXREADLINESZ 1024
char *
fetchline(void)
{
char *p, *line = malloc(MAXREADLINESZ);
if (!line)
return NULL;
if (!fgets(line, MAXREADLINESZ, stdin)) {
free(line);
return NULL;
}
p = line + strlen(line);
if (p != line && p[-1] == '\n')
p[-1] = '\0';
return line;
}
#endif
static char *qemu_strsep(char **input, const char *delim)
{
char *result = *input;
if (result != NULL) {
char *p;
for (p = result; *p != '\0'; p++) {
if (strchr(delim, *p)) {
break;
}
}
if (*p == '\0') {
*input = NULL;
} else {
*p = '\0';
*input = p + 1;
}
}
return result;
}
char **breakline(char *input, int *count)
{
int c = 0;
char *p;
char **rval = calloc(sizeof(char *), 1);
char **tmp;
while (rval && (p = qemu_strsep(&input, " ")) != NULL) {
if (!*p) {
continue;
}
c++;
tmp = realloc(rval, sizeof(*rval) * (c + 1));
if (!tmp) {
free(rval);
rval = NULL;
c = 0;
break;
} else {
rval = tmp;
}
rval[c - 1] = p;
rval[c] = NULL;
}
*count = c;
return rval;
}
void
doneline(
char *input,
char **vec)
{
free(input);
free(vec);
}
#define EXABYTES(x) ((long long)(x) << 60)
#define PETABYTES(x) ((long long)(x) << 50)
#define TERABYTES(x) ((long long)(x) << 40)
#define GIGABYTES(x) ((long long)(x) << 30)
#define MEGABYTES(x) ((long long)(x) << 20)
#define KILOBYTES(x) ((long long)(x) << 10)
long long
cvtnum(
char *s)
{
long long i;
char *sp;
int c;
i = strtoll(s, &sp, 0);
if (i == 0 && sp == s)
return -1LL;
if (*sp == '\0')
return i;
if (sp[1] != '\0')
return -1LL;
c = qemu_tolower(*sp);
switch (c) {
default:
return i;
case 'k':
return KILOBYTES(i);
case 'm':
return MEGABYTES(i);
case 'g':
return GIGABYTES(i);
case 't':
return TERABYTES(i);
case 'p':
return PETABYTES(i);
case 'e':
return EXABYTES(i);
}
return -1LL;
}
#define TO_EXABYTES(x) ((x) / EXABYTES(1))
#define TO_PETABYTES(x) ((x) / PETABYTES(1))
#define TO_TERABYTES(x) ((x) / TERABYTES(1))
#define TO_GIGABYTES(x) ((x) / GIGABYTES(1))
#define TO_MEGABYTES(x) ((x) / MEGABYTES(1))
#define TO_KILOBYTES(x) ((x) / KILOBYTES(1))
void
cvtstr(
double value,
char *str,
size_t size)
{
const char *fmt;
int precise;
precise = ((double)value * 1000 == (double)(int)value * 1000);
if (value >= EXABYTES(1)) {
fmt = precise ? "%.f EiB" : "%.3f EiB";
snprintf(str, size, fmt, TO_EXABYTES(value));
} else if (value >= PETABYTES(1)) {
fmt = precise ? "%.f PiB" : "%.3f PiB";
snprintf(str, size, fmt, TO_PETABYTES(value));
} else if (value >= TERABYTES(1)) {
fmt = precise ? "%.f TiB" : "%.3f TiB";
snprintf(str, size, fmt, TO_TERABYTES(value));
} else if (value >= GIGABYTES(1)) {
fmt = precise ? "%.f GiB" : "%.3f GiB";
snprintf(str, size, fmt, TO_GIGABYTES(value));
} else if (value >= MEGABYTES(1)) {
fmt = precise ? "%.f MiB" : "%.3f MiB";
snprintf(str, size, fmt, TO_MEGABYTES(value));
} else if (value >= KILOBYTES(1)) {
fmt = precise ? "%.f KiB" : "%.3f KiB";
snprintf(str, size, fmt, TO_KILOBYTES(value));
} else {
snprintf(str, size, "%f bytes", value);
}
}
struct timeval
tsub(struct timeval t1, struct timeval t2)
{
t1.tv_usec -= t2.tv_usec;
if (t1.tv_usec < 0) {
t1.tv_usec += 1000000;
t1.tv_sec--;
}
t1.tv_sec -= t2.tv_sec;
return t1;
}
double
tdiv(double value, struct timeval tv)
{
return value / ((double)tv.tv_sec + ((double)tv.tv_usec / 1000000.0));
}
#define HOURS(sec) ((sec) / (60 * 60))
#define MINUTES(sec) (((sec) % (60 * 60)) / 60)
#define SECONDS(sec) ((sec) % 60)
void
timestr(
struct timeval *tv,
char *ts,
size_t size,
int format)
{
double usec = (double)tv->tv_usec / 1000000.0;
if (format & TERSE_FIXED_TIME) {
if (!HOURS(tv->tv_sec)) {
snprintf(ts, size, "%u:%02u.%02u",
(unsigned int) MINUTES(tv->tv_sec),
(unsigned int) SECONDS(tv->tv_sec),
(unsigned int) (usec * 100));
return;
}
format |= VERBOSE_FIXED_TIME; /* fallback if hours needed */
}
if ((format & VERBOSE_FIXED_TIME) || tv->tv_sec) {
snprintf(ts, size, "%u:%02u:%02u.%02u",
(unsigned int) HOURS(tv->tv_sec),
(unsigned int) MINUTES(tv->tv_sec),
(unsigned int) SECONDS(tv->tv_sec),
(unsigned int) (usec * 100));
} else {
snprintf(ts, size, "0.%04u sec", (unsigned int) (usec * 10000));
}
}
/* from libxcmd/quit.c */
static cmdinfo_t quit_cmd;
/* ARGSUSED */
static int
quit_f(
int argc,
char **argv)
{
return 1;
}
void
quit_init(void)
{
quit_cmd.name = _("quit");
quit_cmd.altname = _("q");
quit_cmd.cfunc = quit_f;
quit_cmd.argmin = -1;
quit_cmd.argmax = -1;
quit_cmd.flags = CMD_FLAG_GLOBAL;
quit_cmd.oneline = _("exit the program");
add_command(&quit_cmd);
}
/* from libxcmd/help.c */
static cmdinfo_t help_cmd;
static void help_onecmd(const char *cmd, const cmdinfo_t *ct);
static void help_oneline(const char *cmd, const cmdinfo_t *ct);
static void
help_all(void)
{
const cmdinfo_t *ct;
for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++)
help_oneline(ct->name, ct);
printf(_("\nUse 'help commandname' for extended help.\n"));
}
static int
help_f(
int argc,
char **argv)
{
const cmdinfo_t *ct;
if (argc == 1) {
help_all();
return 0;
}
ct = find_command(argv[1]);
if (ct == NULL) {
printf(_("command %s not found\n"), argv[1]);
return 0;
}
help_onecmd(argv[1], ct);
return 0;
}
static void
help_onecmd(
const char *cmd,
const cmdinfo_t *ct)
{
help_oneline(cmd, ct);
if (ct->help)
ct->help();
}
static void
help_oneline(
const char *cmd,
const cmdinfo_t *ct)
{
if (cmd)
printf("%s ", cmd);
else {
printf("%s ", ct->name);
if (ct->altname)
printf("(or %s) ", ct->altname);
}
if (ct->args)
printf("%s ", ct->args);
printf("-- %s\n", ct->oneline);
}
void
help_init(void)
{
help_cmd.name = _("help");
help_cmd.altname = _("?");
help_cmd.cfunc = help_f;
help_cmd.argmin = 0;
help_cmd.argmax = 1;
help_cmd.flags = CMD_FLAG_GLOBAL;
help_cmd.args = _("[command]");
help_cmd.oneline = _("help for one or all commands");
add_command(&help_cmd);
}
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