Unix中的文件定义在哪里
我知道文件是一个类型定义的结构,但我在哪里可以使用手册页查找结构文件的实际定义?如果从Unix中的文件定义在哪里,unix,Unix,我知道文件是一个类型定义的结构,但我在哪里可以使用手册页查找结构文件的实际定义?如果从/usr/include/stdio.h开始,您会发现这一行: typedef struct _IO_FILE FILE; 只需在/usr/include中搜索\uuu IO\u文件,就会发现结构是在/usr/include/libio.h中定义的 My/usr/include/libio.h显示了\uu IO\u文件的以下定义: struct _IO_FILE { int _flags; /
/usr/include/stdio.h
开始,您会发现这一行:
typedef struct _IO_FILE FILE;
只需在/usr/include
中搜索\uuu IO\u文件
,就会发现结构是在/usr/include/libio.h
中定义的
My/usr/include/libio.h
显示了\uu IO\u文件的以下定义:
struct _IO_FILE {
int _flags; /* High-order word is _IO_MAGIC; rest is flags. */
#define _IO_file_flags _flags
/* The following pointers correspond to the C++ streambuf protocol. */
/* Note: Tk uses the _IO_read_ptr and _IO_read_end fields directly. */
char* _IO_read_ptr; /* Current read pointer */
char* _IO_read_end; /* End of get area. */
char* _IO_read_base; /* Start of putback+get area. */
char* _IO_write_base; /* Start of put area. */
char* _IO_write_ptr; /* Current put pointer. */
char* _IO_write_end; /* End of put area. */
char* _IO_buf_base; /* Start of reserve area. */
char* _IO_buf_end; /* End of reserve area. */
/* The following fields are used to support backing up and undo. */
char *_IO_save_base; /* Pointer to start of non-current get area. */
char *_IO_backup_base; /* Pointer to first valid character of backup area */
char *_IO_save_end; /* Pointer to end of non-current get area. */
struct _IO_marker *_markers;
struct _IO_FILE *_chain;
int _fileno;
#if 0
int _blksize;
#else
int _flags2;
#endif
_IO_off_t _old_offset; /* This used to be _offset but it's too small. */
#define __HAVE_COLUMN /* temporary */
/* 1+column number of pbase(); 0 is unknown. */
unsigned short _cur_column;
signed char _vtable_offset;
char _shortbuf[1];
/* char* _save_gptr; char* _save_egptr; */
_IO_lock_t *_lock;
#ifdef _IO_USE_OLD_IO_FILE
};
struct _IO_FILE_complete
{
struct _IO_FILE _file;
#endif
#if defined _G_IO_IO_FILE_VERSION && _G_IO_IO_FILE_VERSION == 0x20001
_IO_off64_t _offset;
# if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
/* Wide character stream stuff. */
struct _IO_codecvt *_codecvt;
struct _IO_wide_data *_wide_data;
struct _IO_FILE *_freeres_list;
void *_freeres_buf;
size_t _freeres_size;
# else
void *__pad1;
void *__pad2;
void *__pad3;
void *__pad4;
size_t __pad5;
# endif
int _mode;
/* Make sure we don't get into trouble again. */
char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
#endif
};
查看/usr/include/libio.h
中的struct\u IO\u文件
这是一个很好的答案,但我想补充的是文件
是一种不透明类型。你不打算看它的定义;它是用于C标准库的内部使用,其他代码不应该查看它的内部。在不同的平台和版本中,细节会有很大的不同。@ErnestFriedman Hill我喜欢你对不透明类型的解释。