File:  [Qemu by Fabrice Bellard] / qemu / osdep.c
Revision 1.1.1.7 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:34:44 2018 UTC (3 years, 3 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu0121, qemu0120, HEAD
qemu 0.12.0

    1: /*
    2:  * QEMU low level functions
    3:  *
    4:  * Copyright (c) 2003 Fabrice Bellard
    5:  *
    6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
    7:  * of this software and associated documentation files (the "Software"), to deal
    8:  * in the Software without restriction, including without limitation the rights
    9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   10:  * copies of the Software, and to permit persons to whom the Software is
   11:  * furnished to do so, subject to the following conditions:
   12:  *
   13:  * The above copyright notice and this permission notice shall be included in
   14:  * all copies or substantial portions of the Software.
   15:  *
   16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
   19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   22:  * THE SOFTWARE.
   23:  */
   24: #include <stdlib.h>
   25: #include <stdio.h>
   26: #include <stdarg.h>
   27: #include <string.h>
   28: #include <errno.h>
   29: #include <unistd.h>
   30: #include <fcntl.h>
   31: #ifdef CONFIG_SOLARIS
   32: #include <sys/types.h>
   33: #include <sys/statvfs.h>
   34: #endif
   35: 
   36: /* Needed early for CONFIG_BSD etc. */
   37: #include "config-host.h"
   38: 
   39: #ifdef _WIN32
   40: #include <windows.h>
   41: #elif defined(CONFIG_BSD)
   42: #include <stdlib.h>
   43: #else
   44: #include <malloc.h>
   45: #endif
   46: 
   47: #include "qemu-common.h"
   48: #include "sysemu.h"
   49: #include "qemu_socket.h"
   50: 
   51: #if !defined(_POSIX_C_SOURCE) || defined(_WIN32) || defined(__sun__)
   52: static void *oom_check(void *ptr)
   53: {
   54:     if (ptr == NULL) {
   55:         abort();
   56:     }
   57:     return ptr;
   58: }
   59: #endif
   60: 
   61: #if defined(_WIN32)
   62: void *qemu_memalign(size_t alignment, size_t size)
   63: {
   64:     if (!size) {
   65:         abort();
   66:     }
   67:     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
   68: }
   69: 
   70: void *qemu_vmalloc(size_t size)
   71: {
   72:     /* FIXME: this is not exactly optimal solution since VirtualAlloc
   73:        has 64Kb granularity, but at least it guarantees us that the
   74:        memory is page aligned. */
   75:     if (!size) {
   76:         abort();
   77:     }
   78:     return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
   79: }
   80: 
   81: void qemu_vfree(void *ptr)
   82: {
   83:     VirtualFree(ptr, 0, MEM_RELEASE);
   84: }
   85: 
   86: #else
   87: 
   88: void *qemu_memalign(size_t alignment, size_t size)
   89: {
   90: #if defined(_POSIX_C_SOURCE) && !defined(__sun__)
   91:     int ret;
   92:     void *ptr;
   93:     ret = posix_memalign(&ptr, alignment, size);
   94:     if (ret != 0)
   95:         abort();
   96:     return ptr;
   97: #elif defined(CONFIG_BSD)
   98:     return oom_check(valloc(size));
   99: #else
  100:     return oom_check(memalign(alignment, size));
  101: #endif
  102: }
  103: 
  104: /* alloc shared memory pages */
  105: void *qemu_vmalloc(size_t size)
  106: {
  107:     return qemu_memalign(getpagesize(), size);
  108: }
  109: 
  110: void qemu_vfree(void *ptr)
  111: {
  112:     free(ptr);
  113: }
  114: 
  115: #endif
  116: 
  117: int qemu_create_pidfile(const char *filename)
  118: {
  119:     char buffer[128];
  120:     int len;
  121: #ifndef _WIN32
  122:     int fd;
  123: 
  124:     fd = qemu_open(filename, O_RDWR | O_CREAT, 0600);
  125:     if (fd == -1)
  126:         return -1;
  127: 
  128:     if (lockf(fd, F_TLOCK, 0) == -1)
  129:         return -1;
  130: 
  131:     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
  132:     if (write(fd, buffer, len) != len)
  133:         return -1;
  134: #else
  135:     HANDLE file;
  136:     DWORD flags;
  137:     OVERLAPPED overlap;
  138:     BOOL ret;
  139: 
  140:     /* Open for writing with no sharing. */
  141:     file = CreateFile(filename, GENERIC_WRITE, 0, NULL,
  142: 		      OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
  143: 
  144:     if (file == INVALID_HANDLE_VALUE)
  145:       return -1;
  146: 
  147:     flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
  148:     overlap.hEvent = 0;
  149:     /* Lock 1 byte. */
  150:     ret = LockFileEx(file, flags, 0, 0, 1, &overlap);
  151:     if (ret == 0)
  152:       return -1;
  153: 
  154:     /* Write PID to file. */
  155:     len = snprintf(buffer, sizeof(buffer), "%ld\n", (long)getpid());
  156:     ret = WriteFileEx(file, (LPCVOID)buffer, (DWORD)len,
  157: 		      &overlap, NULL);
  158:     if (ret == 0)
  159:       return -1;
  160: #endif
  161:     return 0;
  162: }
  163: 
  164: #ifdef _WIN32
  165: 
  166: /* Offset between 1/1/1601 and 1/1/1970 in 100 nanosec units */
  167: #define _W32_FT_OFFSET (116444736000000000ULL)
  168: 
  169: int qemu_gettimeofday(qemu_timeval *tp)
  170: {
  171:   union {
  172:     unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
  173:     FILETIME ft;
  174:   }  _now;
  175: 
  176:   if(tp)
  177:     {
  178:       GetSystemTimeAsFileTime (&_now.ft);
  179:       tp->tv_usec=(long)((_now.ns100 / 10ULL) % 1000000ULL );
  180:       tp->tv_sec= (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
  181:     }
  182:   /* Always return 0 as per Open Group Base Specifications Issue 6.
  183:      Do not set errno on error.  */
  184:   return 0;
  185: }
  186: #endif /* _WIN32 */
  187: 
  188: 
  189: #ifdef _WIN32
  190: void socket_set_nonblock(int fd)
  191: {
  192:     unsigned long opt = 1;
  193:     ioctlsocket(fd, FIONBIO, &opt);
  194: }
  195: 
  196: int inet_aton(const char *cp, struct in_addr *ia)
  197: {
  198:     uint32_t addr = inet_addr(cp);
  199:     if (addr == 0xffffffff)
  200: 	return 0;
  201:     ia->s_addr = addr;
  202:     return 1;
  203: }
  204: 
  205: void qemu_set_cloexec(int fd)
  206: {
  207: }
  208: 
  209: #else
  210: 
  211: void socket_set_nonblock(int fd)
  212: {
  213:     int f;
  214:     f = fcntl(fd, F_GETFL);
  215:     fcntl(fd, F_SETFL, f | O_NONBLOCK);
  216: }
  217: 
  218: void qemu_set_cloexec(int fd)
  219: {
  220:     int f;
  221:     f = fcntl(fd, F_GETFD);
  222:     fcntl(fd, F_SETFD, f | FD_CLOEXEC);
  223: }
  224: 
  225: #endif
  226: 
  227: /*
  228:  * Opens a file with FD_CLOEXEC set
  229:  */
  230: int qemu_open(const char *name, int flags, ...)
  231: {
  232:     int ret;
  233:     int mode = 0;
  234: 
  235:     if (flags & O_CREAT) {
  236:         va_list ap;
  237: 
  238:         va_start(ap, flags);
  239:         mode = va_arg(ap, int);
  240:         va_end(ap);
  241:     }
  242: 
  243: #ifdef O_CLOEXEC
  244:     ret = open(name, flags | O_CLOEXEC, mode);
  245: #else
  246:     ret = open(name, flags, mode);
  247:     if (ret >= 0) {
  248:         qemu_set_cloexec(ret);
  249:     }
  250: #endif
  251: 
  252:     return ret;
  253: }
  254: 
  255: #ifndef _WIN32
  256: /*
  257:  * Creates a pipe with FD_CLOEXEC set on both file descriptors
  258:  */
  259: int qemu_pipe(int pipefd[2])
  260: {
  261:     int ret;
  262: 
  263: #ifdef CONFIG_PIPE2
  264:     ret = pipe2(pipefd, O_CLOEXEC);
  265:     if (ret != -1 || errno != ENOSYS) {
  266:         return ret;
  267:     }
  268: #endif
  269:     ret = pipe(pipefd);
  270:     if (ret == 0) {
  271:         qemu_set_cloexec(pipefd[0]);
  272:         qemu_set_cloexec(pipefd[1]);
  273:     }
  274: 
  275:     return ret;
  276: }
  277: #endif
  278: 
  279: /*
  280:  * Opens a socket with FD_CLOEXEC set
  281:  */
  282: int qemu_socket(int domain, int type, int protocol)
  283: {
  284:     int ret;
  285: 
  286: #ifdef SOCK_CLOEXEC
  287:     ret = socket(domain, type | SOCK_CLOEXEC, protocol);
  288:     if (ret != -1 || errno != EINVAL) {
  289:         return ret;
  290:     }
  291: #endif
  292:     ret = socket(domain, type, protocol);
  293:     if (ret >= 0) {
  294:         qemu_set_cloexec(ret);
  295:     }
  296: 
  297:     return ret;
  298: }
  299: 
  300: /*
  301:  * Accept a connection and set FD_CLOEXEC
  302:  */
  303: int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
  304: {
  305:     int ret;
  306: 
  307: #ifdef CONFIG_ACCEPT4
  308:     ret = accept4(s, addr, addrlen, SOCK_CLOEXEC);
  309:     if (ret != -1 || errno != EINVAL) {
  310:         return ret;
  311:     }
  312: #endif
  313:     ret = accept(s, addr, addrlen);
  314:     if (ret >= 0) {
  315:         qemu_set_cloexec(ret);
  316:     }
  317: 
  318:     return ret;
  319: }

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