1 /* file.h 4.14 82/11/13 */ 2 3 #ifdef KERNEL 4 /* 5 * Descriptor table entry. 6 * One for each kernel object. 7 */ 8 struct file { 9 short f_flag; /* see below */ 10 short f_type; /* descriptor type */ 11 char f_nbhow; /* state from dnblock */ 12 char f_sighow; /* state from dsignal */ 13 short f_count; /* reference count */ 14 /* begin XXX */ 15 struct inode *f_inode; /* inode */ 16 union { 17 struct f_in { off_t fi_offset; } f_in; 18 struct f_so { struct socket *fs_socket; } f_so; 19 } f_un; 20 #define f_offset f_un.f_in.fi_offset 21 #define f_socket f_un.f_so.fs_socket 22 /* end XXX */ 23 }; 24 25 struct file *file, *fileNFILE; 26 int nfile; 27 struct file *getf(); 28 struct file *falloc(); 29 30 /* flags */ 31 #define FREAD 0x001 /* descriptor read/receive'able */ 32 #define FWRITE 0x002 /* descriptor write/send'able */ 33 #define FAPPEND 0x004 /* append on each write */ 34 /* the following defines the bits that users can set in f_flag */ 35 #define FMODES (FREAD|FWRITE|FAPPEND) 36 #endif 37 38 /* 39 * User visible desriptor attributes. 40 * These are supplied at open or flock time. 41 * FRDONLY, FWRONLY, and FRDWR are 42 * converted to FREAD and FWRITE on open. 43 */ 44 #define FRDONLY 0x000 /* open for reading only */ 45 #define FWRONLY 0x001 /* open for writing only */ 46 #define FRDWR 0x002 /* open for reading and writing */ 47 #define FAPPEND 0x004 /* append on each write */ 48 #define FSHLOCK 0x008 /* apply shared lock */ 49 #define FEXLOCK 0x010 /* apply exclusive lock */ 50 #define FUNLOCK 0x100 /* release all locks */ 51 #define FCREATE 0x200 /* create file if nonexistant */ 52 #define FTRUNCATE 0x400 /* truncate file to size 0 on open */ 53 #define FNBLOCK 0x800 /* don't block on open */ 54 55 /* these are for 3.0 "compatibility" */ 56 #define O_RDONLY FRDONLY /* open for read */ 57 #define O_WRONLY FWRONLY /* open for writing */ 58 #define O_RDWR FRDWR /* open for read & write */ 59 #define O_NDELAY FNBLOCK /* non-blocking I/O */ 60 #define O_APPEND FAPPEND /* append */ 61 #define O_CREAT FCREATE /* open with file create */ 62 #define O_TRUNC FTRUNCATE /* open with truncation */ 63 #define O_EXCL FEXLOCK /* exclusive open */ 64 65 /* flags supplied to access call */ 66 #define FACCESS_EXISTS 0x0 /* does file exist */ 67 #define FACCESS_EXECUTE 0x1 /* is it executable by caller */ 68 #define FACCESS_WRITE 0x2 /* writable by caller */ 69 #define FACCESS_READ 0x4 /* readable by caller */ 70 71 /* flags supplies to lseek call */ 72 #define FSEEK_ABSOLUTE 0x0 /* absolute offset */ 73 #define FSEEK_RELATIVE 0x1 /* relative to current offset */ 74 #define FSEEK_EOF 0x2 /* relative to end of file */ 75 76 /* file types which may be specified to mknod */ 77 #define FTYPE_CDEV 0x2000 /* character special device */ 78 #define FTYPE_DIR 0x4000 /* directory */ 79 #define FTYPE_BDEV 0x8000 /* block special device */ 80 81 #define GETF(fp, fd) { \ 82 if ((unsigned)(fd) >= NOFILE || ((fp) = u.u_ofile[fd]) == NULL) { \ 83 u.u_error = EBADF; \ 84 return; \ 85 } \ 86 } 87