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117 lines
3.5 KiB
117 lines
3.5 KiB
/*
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** 2004 May 22
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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******************************************************************************
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**
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** This header file defined OS-specific features for Unix.
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*/
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#ifndef _SQLITE_OS_UNIX_H_
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#define _SQLITE_OS_UNIX_H_
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/*
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** Helpful hint: To get this to compile on HP/UX, add -D_INCLUDE_POSIX_SOURCE
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** to the compiler command line.
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*/
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/*
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** These #defines should enable >2GB file support on Posix if the
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** underlying operating system supports it. If the OS lacks
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** large file support, or if the OS is windows, these should be no-ops.
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**
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** Large file support can be disabled using the -DSQLITE_DISABLE_LFS switch
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** on the compiler command line. This is necessary if you are compiling
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** on a recent machine (ex: RedHat 7.2) but you want your code to work
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** on an older machine (ex: RedHat 6.0). If you compile on RedHat 7.2
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** without this option, LFS is enable. But LFS does not exist in the kernel
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** in RedHat 6.0, so the code won't work. Hence, for maximum binary
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** portability you should omit LFS.
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**
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** Similar is true for MacOS. LFS is only supported on MacOS 9 and later.
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*/
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#ifndef SQLITE_DISABLE_LFS
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# define _LARGE_FILE 1
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# ifndef _FILE_OFFSET_BITS
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# define _FILE_OFFSET_BITS 64
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# endif
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# define _LARGEFILE_SOURCE 1
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#endif
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/*
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** standard include files.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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/*
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** Macros used to determine whether or not to use threads. The
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** SQLITE_UNIX_THREADS macro is defined if we are synchronizing for
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** Posix threads and SQLITE_W32_THREADS is defined if we are
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** synchronizing using Win32 threads.
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*/
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#if defined(THREADSAFE) && THREADSAFE
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# include <pthread.h>
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# define SQLITE_UNIX_THREADS 1
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#endif
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/*
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** The OsFile structure is a operating-system independing representation
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** of an open file handle. It is defined differently for each architecture.
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**
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** This is the definition for Unix.
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**
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** OsFile.locktype takes one of the values SHARED_LOCK, RESERVED_LOCK,
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** PENDING_LOCK or EXCLUSIVE_LOCK.
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*/
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typedef struct OsFile OsFile;
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struct OsFile {
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struct Pager *pPager; /* The pager that owns this OsFile. Might be 0 */
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struct openCnt *pOpen; /* Info about all open fd's on this inode */
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struct lockInfo *pLock; /* Info about locks on this inode */
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int h; /* The file descriptor */
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unsigned char locktype; /* The type of lock held on this fd */
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unsigned char isOpen; /* True if needs to be closed */
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unsigned char fullSync; /* Use F_FULLSYNC if available */
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int dirfd; /* File descriptor for the directory */
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#ifdef SQLITE_UNIX_THREADS
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pthread_t tid; /* The thread authorized to use this OsFile */
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#endif
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};
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/*
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** A macro to set the OsFile.fullSync flag, if it exists.
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*/
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#define SET_FULLSYNC(x,y) ((x).fullSync = (y))
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/*
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** Maximum number of characters in a temporary file name
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*/
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#define SQLITE_TEMPNAME_SIZE 200
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/*
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** Minimum interval supported by sqlite3OsSleep().
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*/
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#if defined(HAVE_USLEEP) && HAVE_USLEEP
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# define SQLITE_MIN_SLEEP_MS 1
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#else
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# define SQLITE_MIN_SLEEP_MS 1000
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#endif
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/*
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** Default permissions when creating a new file
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*/
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#ifndef SQLITE_DEFAULT_FILE_PERMISSIONS
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# define SQLITE_DEFAULT_FILE_PERMISSIONS 0644
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#endif
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#endif /* _SQLITE_OS_UNIX_H_ */
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