| 1 | /* |
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| 2 | FUNCTION |
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| 3 | <<fdopen64>>---turn open large file into a stream |
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| 4 | |
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| 5 | INDEX |
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| 6 | fdopen64 |
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| 7 | INDEX |
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| 8 | _fdopen64_r |
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| 9 | |
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| 10 | SYNOPSIS |
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| 11 | #include <stdio.h> |
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| 12 | FILE *fdopen64(int <[fd]>, const char *<[mode]>); |
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| 13 | FILE *_fdopen64_r(void *<[reent]>, |
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| 14 | int <[fd]>, const char *<[mode]>); |
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| 15 | |
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| 16 | DESCRIPTION |
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| 17 | <<fdopen64>> produces a file descriptor of type <<FILE *>>, from a |
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| 18 | descriptor for an already-open file (returned, for example, by the |
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| 19 | system subroutine <<open>> rather than by <<fopen>>). |
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| 20 | The <[mode]> argument has the same meanings as in <<fopen>>. |
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| 21 | |
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| 22 | RETURNS |
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| 23 | File pointer or <<NULL>>, as for <<fopen>>. |
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| 24 | */ |
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| 25 | |
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| 26 | #include <sys/types.h> |
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| 27 | #include <sys/fcntl.h> |
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| 28 | |
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| 29 | #include <stdio.h> |
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| 30 | #include <errno.h> |
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| 31 | #include "local.h" |
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| 32 | #include <_syslist.h> |
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| 33 | #include <sys/lock.h> |
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| 34 | |
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| 35 | extern int __sflags (); |
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| 36 | |
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| 37 | FILE * |
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| 38 | _fdopen64_r (struct _reent *ptr, |
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| 39 | int fd, |
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| 40 | const char *mode) |
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| 41 | { |
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| 42 | register FILE *fp; |
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| 43 | int flags, oflags; |
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| 44 | #ifdef HAVE_FCNTL |
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| 45 | int fdflags, fdmode; |
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| 46 | #endif |
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| 47 | |
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| 48 | if ((flags = __sflags (ptr, mode, &oflags)) == 0) |
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| 49 | return 0; |
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| 50 | |
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| 51 | /* make sure the mode the user wants is a subset of the actual mode */ |
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| 52 | #ifdef HAVE_FCNTL |
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| 53 | if ((fdflags = _fcntl_r (ptr, fd, F_GETFL, 0)) < 0) |
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| 54 | return 0; |
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| 55 | fdmode = fdflags & O_ACCMODE; |
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| 56 | if (fdmode != O_RDWR && (fdmode != (oflags & O_ACCMODE))) |
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| 57 | { |
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| 58 | ptr->_errno = EBADF; |
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| 59 | return 0; |
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| 60 | } |
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| 61 | #endif |
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| 62 | |
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| 63 | if ((fp = __sfp (ptr)) == 0) |
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| 64 | return 0; |
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| 65 | |
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| 66 | _newlib_flockfile_start(fp); |
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| 67 | |
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| 68 | fp->_flags = flags; |
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| 69 | /* POSIX recommends setting the O_APPEND bit on fd to match append |
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| 70 | streams. Someone may later clear O_APPEND on fileno(fp), but the |
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| 71 | stream must still remain in append mode. Rely on __sflags |
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| 72 | setting __SAPP properly. */ |
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| 73 | #ifdef HAVE_FCNTL |
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| 74 | if ((oflags & O_APPEND) && !(fdflags & O_APPEND)) |
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| 75 | _fcntl_r (ptr, fd, F_SETFL, fdflags | O_APPEND); |
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| 76 | #endif |
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| 77 | fp->_file = fd; |
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| 78 | fp->_cookie = (void *) fp; |
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| 79 | |
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| 80 | #undef _read |
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| 81 | #undef _write |
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| 82 | #undef _seek |
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| 83 | #undef _close |
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| 84 | |
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| 85 | fp->_read = __sread; |
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| 86 | fp->_write = __swrite64; |
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| 87 | fp->_seek = __sseek; |
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| 88 | fp->_seek64 = __sseek64; |
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| 89 | fp->_close = __sclose; |
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| 90 | |
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| 91 | #ifdef __SCLE |
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| 92 | /* Explicit given mode results in explicit setting mode on fd */ |
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| 93 | if (oflags & O_BINARY) |
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| 94 | setmode(fp->_file, O_BINARY); |
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| 95 | else if (oflags & O_TEXT) |
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| 96 | setmode(fp->_file, O_TEXT); |
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| 97 | if (__stextmode(fp->_file)) |
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| 98 | fp->_flags |= __SCLE; |
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| 99 | #endif |
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| 100 | |
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| 101 | fp->_flags |= __SL64; |
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| 102 | |
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| 103 | _newlib_flockfile_end(fp); |
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| 104 | return fp; |
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| 105 | } |
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| 106 | |
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| 107 | #ifndef _REENT_ONLY |
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| 108 | |
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| 109 | FILE * |
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| 110 | fdopen64 (int fd, |
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| 111 | const char *mode) |
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| 112 | { |
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| 113 | return _fdopen64_r (_REENT, fd, mode); |
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| 114 | } |
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| 115 | |
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| 116 | #endif |
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