/* * QEMU low level functions * * Copyright (c) 2003 Fabrice Bellard * * 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 <stdlib.h> #include <stdio.h> #include <stdarg.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <fcntl.h> /* Needed early for CONFIG_BSD etc. */ #include "config-host.h" #if defined(CONFIG_MADVISE) || defined(CONFIG_POSIX_MADVISE) #include <sys/mman.h> #endif #ifdef CONFIG_SOLARIS #include <sys/types.h> #include <sys/statvfs.h> /* See MySQL bug #7156 (http://bugs.mysql.com/bug.php?id=7156) for discussion about Solaris header problems */ extern int madvise(caddr_t, size_t, int); #endif #include "qemu-common.h" #include "trace.h" #include "qemu_socket.h" int socket_set_cork(int fd, int v) { #if defined(SOL_TCP) && defined(TCP_CORK) return setsockopt(fd, SOL_TCP, TCP_CORK, &v, sizeof(v)); #else return 0; #endif } int qemu_madvise(void *addr, size_t len, int advice) { if (advice == QEMU_MADV_INVALID) { errno = EINVAL; return -1; } #if defined(CONFIG_MADVISE) return madvise(addr, len, advice); #elif defined(CONFIG_POSIX_MADVISE) return posix_madvise(addr, len, advice); #else errno = EINVAL; return -1; #endif } /* * Opens a file with FD_CLOEXEC set */ int qemu_open(const char *name, int flags, ...) { int ret; int mode = 0; if (flags & O_CREAT) { va_list ap; va_start(ap, flags); mode = va_arg(ap, int); va_end(ap); } #ifdef O_CLOEXEC ret = open(name, flags | O_CLOEXEC, mode); #else ret = open(name, flags, mode); if (ret >= 0) { qemu_set_cloexec(ret); } #endif return ret; } /* * A variant of write(2) which handles partial write. * * Return the number of bytes transferred. * Set errno if fewer than `count' bytes are written. * * This function don't work with non-blocking fd's. * Any of the possibilities with non-bloking fd's is bad: * - return a short write (then name is wrong) * - busy wait adding (errno == EAGAIN) to the loop */ ssize_t qemu_write_full(int fd, const void *buf, size_t count) { ssize_t ret = 0; ssize_t total = 0; while (count) { ret = write(fd, buf, count); if (ret < 0) { if (errno == EINTR) continue; break; } count -= ret; buf += ret; total += ret; } return total; } /* * Opens a socket with FD_CLOEXEC set */ int qemu_socket(int domain, int type, int protocol) { int ret; #ifdef SOCK_CLOEXEC ret = socket(domain, type | SOCK_CLOEXEC, protocol); if (ret != -1 || errno != EINVAL) { return ret; } #endif ret = socket(domain, type, protocol); if (ret >= 0) { qemu_set_cloexec(ret); } return ret; } /* * Accept a connection and set FD_CLOEXEC */ int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) { int ret; #ifdef CONFIG_ACCEPT4 ret = accept4(s, addr, addrlen, SOCK_CLOEXEC); if (ret != -1 || errno != ENOSYS) { return ret; } #endif ret = accept(s, addr, addrlen); if (ret >= 0) { qemu_set_cloexec(ret); } return ret; } /* * A variant of send(2) which handles partial write. * * Return the number of bytes transferred, which is only * smaller than `count' if there is an error. * * This function won't work with non-blocking fd's. * Any of the possibilities with non-bloking fd's is bad: * - return a short write (then name is wrong) * - busy wait adding (errno == EAGAIN) to the loop */ ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags) { ssize_t ret = 0; ssize_t total = 0; while (count) { ret = send(fd, buf, count, flags); if (ret < 0) { if (errno == EINTR) { continue; } break; } count -= ret; buf += ret; total += ret; } return total; } /* * A variant of recv(2) which handles partial write. * * Return the number of bytes transferred, which is only * smaller than `count' if there is an error. * * This function won't work with non-blocking fd's. * Any of the possibilities with non-bloking fd's is bad: * - return a short write (then name is wrong) * - busy wait adding (errno == EAGAIN) to the loop */ ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags) { ssize_t ret = 0; ssize_t total = 0; while (count) { ret = qemu_recv(fd, buf, count, flags); if (ret <= 0) { if (ret < 0 && errno == EINTR) { continue; } break; } count -= ret; buf += ret; total += ret; } return total; }