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198 lines
5.6 KiB
198 lines
5.6 KiB
2 years ago
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 1997 - July 2008 CWI, August 2008 - 2022 MonetDB B.V.
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*/
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#ifndef GDK_POSIX_H
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#define GDK_POSIX_H
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#include <sys/types.h>
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#include <time.h>
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#ifdef HAVE_FTIME
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#include <sys/timeb.h> /* ftime */
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#endif
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h> /* gettimeofday */
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#endif
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#ifndef HAVE_SYS_SOCKET_H
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#ifdef HAVE_WINSOCK_H
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#include <winsock.h> /* for timeval */
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#endif
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#endif
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#include "gdk_system.h" /* gdk_export */
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#ifdef NATIVE_WIN32
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#include <io.h>
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#include <direct.h>
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#endif
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/*
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* @- virtual memory
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*/
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#define MT_VMUNITLOG 16
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#define MT_VMUNITSIZE (1 << MT_VMUNITLOG)
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/* make sure POSIX_MADV_* and posix_madvise() are defined somehow */
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#ifdef HAVE_SYS_MMAN_H
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# ifndef __USE_BSD
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# define __USE_BSD
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# endif
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# include <sys/mman.h>
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#endif
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#ifdef __linux__
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/* on Linux, posix_madvise does not seem to work, fall back to classic
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* madvise */
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#undef HAVE_POSIX_MADVISE
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#undef HAVE_POSIX_FADVISE
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#undef POSIX_MADV_NORMAL
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#undef POSIX_MADV_RANDOM
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#undef POSIX_MADV_SEQUENTIAL
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#undef POSIX_MADV_WILLNEED
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#undef POSIX_MADV_DONTNEED
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#endif
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#ifndef HAVE_POSIX_MADVISE
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# ifdef HAVE_MADVISE
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# define posix_madvise madvise
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# define HAVE_POSIX_MADVISE 1
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# ifndef MADV_RANDOM
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# define MADV_RANDOM 0
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# endif
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# ifndef POSIX_MADV_NORMAL
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# define POSIX_MADV_NORMAL MADV_NORMAL
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# define POSIX_MADV_RANDOM MADV_RANDOM
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# define POSIX_MADV_SEQUENTIAL MADV_SEQUENTIAL
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# define POSIX_MADV_WILLNEED MADV_WILLNEED
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# define POSIX_MADV_DONTNEED MADV_DONTNEED
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# endif
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# else
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# define posix_madvise(x,y,z) 0
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# ifndef POSIX_MADV_NORMAL
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# define POSIX_MADV_NORMAL 0
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# define POSIX_MADV_RANDOM 0
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# define POSIX_MADV_SEQUENTIAL 0
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# define POSIX_MADV_WILLNEED 0
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# define POSIX_MADV_DONTNEED 0
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# endif
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# endif
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#endif
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/* in case they are still not defined, define these values as
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* something that doesn't do anything */
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#ifndef POSIX_MADV_NORMAL
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#define POSIX_MADV_NORMAL 0
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#endif
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#ifndef POSIX_MADV_RANDOM
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#define POSIX_MADV_RANDOM 0
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#endif
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#ifndef POSIX_MADV_SEQUENTIAL
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#define POSIX_MADV_SEQUENTIAL 0
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#endif
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#ifndef POSIX_MADV_WILLNEED
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#define POSIX_MADV_WILLNEED 0
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#endif
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#ifndef POSIX_MADV_DONTNEED
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#define POSIX_MADV_DONTNEED 0
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#endif
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/* the new mmap modes, mimic default MADV_* madvise POSIX constants */
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#define MMAP_NORMAL POSIX_MADV_NORMAL /* no further special treatment */
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#define MMAP_RANDOM POSIX_MADV_RANDOM /* expect random page references */
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#define MMAP_SEQUENTIAL POSIX_MADV_SEQUENTIAL /* expect sequential page references */
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#define MMAP_WILLNEED POSIX_MADV_WILLNEED /* will need these pages */
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#define MMAP_DONTNEED POSIX_MADV_DONTNEED /* don't need these pages */
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#define MMAP_READ 1024 /* region is readable (default if ommitted) */
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#define MMAP_WRITE 2048 /* region may be written into */
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#define MMAP_COPY 4096 /* writable, but changes never reach file */
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#define MMAP_ASYNC 8192 /* asynchronous writes (default if ommitted) */
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#define MMAP_SYNC 16384 /* writing is done synchronously */
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/* in order to be sure of madvise and msync modes, pass them to mmap()
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* call as well */
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gdk_export size_t MT_getrss(void);
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gdk_export bool MT_path_absolute(const char *path);
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/*
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* @+ Posix under WIN32
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* WIN32 actually supports many Posix functions directly. Some it
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* does not, though. For some functionality we move in Monet from
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* Posix calls to MT_*() calls, which translate easier to WIN32.
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* Examples are MT_mmap() , MT_sleep_ms() and MT_path_absolute(). Why?
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* In the case of mmap() it is much easier for WIN32 to get a filename
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* parameter rather than a file-descriptor. That is the reason in the
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* case of mmap() to go for a MT_mmap() solution.
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*
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* For some other functionality, we do not need to abandon the Posix
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* interface, though. Two cases can be distinguished. Missing
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* functions in WIN32 are directly implemented
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* (e.g. dlopen()/dlsym()/dlclose()). Posix functions in WIN32 whose
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* functionality should be changed a bit. Examples are
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* stat()/rename()/mkdir()/rmdir() who under WIN32 do not work if the
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* path ends with a directory separator, but should work according to
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* Posix. We remap such functions using a define to an equivalent
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* win_*() function (which in its implementation calls through to the
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* WIN32 function).
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*/
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gdk_export void *mdlopen(const char *library, int mode);
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#ifdef NATIVE_WIN32
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#define RTLD_LAZY 1
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#define RTLD_NOW 2
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#define RTLD_GLOBAL 4
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gdk_export void *dlopen(const char *file, int mode);
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gdk_export int dlclose(void *handle);
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gdk_export void *dlsym(void *handle, const char *name);
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gdk_export char *dlerror(void);
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#ifndef HAVE_GETTIMEOFDAY
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gdk_export int gettimeofday(struct timeval *tv, int *ignore_zone);
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#endif
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#endif /* NATIVE_WIN32 */
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#ifndef HAVE_LOCALTIME_R
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gdk_export struct tm *localtime_r(const time_t *restrict, struct tm *restrict);
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#endif
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#ifndef HAVE_GMTIME_R
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gdk_export struct tm *gmtime_r(const time_t *restrict, struct tm *restrict);
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#endif
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#ifndef HAVE_ASCTIME_R
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gdk_export char *asctime_r(const struct tm *restrict, char *restrict);
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#endif
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#ifndef HAVE_CTIME_R
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gdk_export char *ctime_r(const time_t *restrict, char *restrict);
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#endif
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#ifndef HAVE_STRERROR_R
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gdk_export int strerror_r(int errnum, char *buf, size_t buflen);
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#endif
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static inline const char *
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GDKstrerror(int errnum, char *buf, size_t buflen)
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{
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#if !defined(_GNU_SOURCE) || ((_POSIX_C_SOURCE >= 200112L) && !_GNU_SOURCE)
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if (strerror_r(errnum, buf, buflen) == 0)
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return buf;
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snprintf(buf, buflen, "Unknown error %d", errnum);
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return buf;
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#else
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return strerror_r(errnum, buf, buflen);
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#endif
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}
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#endif /* GDK_POSIX_H */
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