/* * QEMU Char Device for testsuite control * * Copyright (c) 2014 Red Hat, Inc. * * Author: Paolo Bonzini <pbonzini@redhat.com> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "qemu-common.h" #include "sysemu/char.h" #define BUF_SIZE 32 typedef struct { CharDriverState *chr; uint8_t in_buf[32]; int in_buf_used; } TestdevCharState; /* Try to interpret a whole incoming packet */ static int testdev_eat_packet(TestdevCharState *testdev) { const uint8_t *cur = testdev->in_buf; int len = testdev->in_buf_used; uint8_t c; int arg; #define EAT(c) do { \ if (!len--) { \ return 0; \ } \ c = *cur++; \ } while (0) EAT(c); while (isspace(c)) { EAT(c); } arg = 0; while (isdigit(c)) { arg = arg * 10 + c - '0'; EAT(c); } while (isspace(c)) { EAT(c); } switch (c) { case 'q': exit((arg << 1) | 1); break; default: break; } return cur - testdev->in_buf; } /* The other end is writing some data. Store it and try to interpret */ static int testdev_write(CharDriverState *chr, const uint8_t *buf, int len) { TestdevCharState *testdev = chr->opaque; int tocopy, eaten, orig_len = len; while (len) { /* Complete our buffer as much as possible */ tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used); memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy); testdev->in_buf_used += tocopy; buf += tocopy; len -= tocopy; /* Interpret it as much as possible */ while (testdev->in_buf_used > 0 && (eaten = testdev_eat_packet(testdev)) > 0) { memmove(testdev->in_buf, testdev->in_buf + eaten, testdev->in_buf_used - eaten); testdev->in_buf_used -= eaten; } } return orig_len; } static void testdev_close(struct CharDriverState *chr) { TestdevCharState *testdev = chr->opaque; g_free(testdev); } CharDriverState *chr_testdev_init(void) { TestdevCharState *testdev; CharDriverState *chr; testdev = g_malloc0(sizeof(TestdevCharState)); testdev->chr = chr = g_malloc0(sizeof(CharDriverState)); chr->opaque = testdev; chr->chr_write = testdev_write; chr->chr_close = testdev_close; return chr; } static void register_types(void) { register_char_driver("testdev", CHARDEV_BACKEND_KIND_TESTDEV, NULL); } type_init(register_types);