int _IO_vdprintf (int d, const char *format, _IO_va_list arg) { struct _IO_FILE_plus tmpfil; struct _IO_wide_data wd; int done; #ifdef _IO_MTSAFE_IO tmpfil.file._lock = NULL; #endif _IO_no_init (&tmpfil.file, _IO_USER_LOCK, 0, &wd, &_IO_wfile_jumps); _IO_JUMPS (&tmpfil) = &_IO_file_jumps; _IO_new_file_init_internal (&tmpfil); #if !_IO_UNIFIED_JUMPTABLES tmpfil.vtable = NULL; #endif if (_IO_file_attach (&tmpfil.file, d) == NULL) { _IO_un_link (&tmpfil); return EOF; } tmpfil.file._flags |= _IO_DELETE_DONT_CLOSE; _IO_mask_flags (&tmpfil.file, _IO_NO_READS, _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); done = _IO_vfprintf (&tmpfil.file, format, arg); if (done != EOF && _IO_do_flush (&tmpfil.file) == EOF) done = EOF; _IO_FINISH (&tmpfil.file); return done; }
_IO_FILE * __fopen_internal (const char *filename, const char *mode, int is32) { struct locked_FILE { struct _IO_FILE_plus fp; #ifdef _IO_MTSAFE_IO _IO_lock_t lock; #endif struct _IO_wide_data wd; } *new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); if (new_f == NULL) return NULL; #ifdef _IO_MTSAFE_IO new_f->fp.file._lock = &new_f->lock; #endif #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &_IO_wfile_jumps); #else _IO_no_init (&new_f->fp.file, 1, 0, NULL, NULL); #endif _IO_JUMPS (&new_f->fp) = &_IO_file_jumps; _IO_new_file_init_internal (&new_f->fp); #if !_IO_UNIFIED_JUMPTABLES new_f->fp.vtable = NULL; #endif if (_IO_file_fopen ((_IO_FILE *) new_f, filename, mode, is32) != NULL) return __fopen_maybe_mmap (&new_f->fp.file); _IO_un_link (&new_f->fp); free (new_f); return NULL; }
FILE * __fopen_internal (const char *filename, const char *mode, int is32) { struct locked_FILE { struct _IO_FILE_plus fp; #ifdef _IO_MTSAFE_IO _IO_lock_t lock; #endif struct _IO_wide_data wd; } *new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); if (new_f == NULL) return NULL; #ifdef _IO_MTSAFE_IO new_f->fp.file._lock = &new_f->lock; #endif _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, &_IO_wfile_jumps); _IO_JUMPS (&new_f->fp) = &_IO_file_jumps; _IO_new_file_init_internal (&new_f->fp); if (_IO_file_fopen ((FILE *) new_f, filename, mode, is32) != NULL) return __fopen_maybe_mmap (&new_f->fp.file); _IO_un_link (&new_f->fp); free (new_f); return NULL; }
int __vdprintf_chk (int d, int flags, const char *format, va_list arg) { struct _IO_FILE_plus tmpfil; struct _IO_wide_data wd; int done; #ifdef _IO_MTSAFE_IO tmpfil.file._lock = NULL; #endif _IO_no_init (&tmpfil.file, _IO_USER_LOCK, 0, &wd, &_IO_wfile_jumps); _IO_JUMPS (&tmpfil) = &_IO_file_jumps; _IO_new_file_init_internal (&tmpfil); if (_IO_file_attach (&tmpfil.file, d) == NULL) { _IO_un_link (&tmpfil); return EOF; } tmpfil.file._flags |= _IO_DELETE_DONT_CLOSE; _IO_mask_flags (&tmpfil.file, _IO_NO_READS, _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n can only come from read-only format strings. */ if (flags > 0) tmpfil.file._flags2 |= _IO_FLAGS2_FORTIFY; done = _IO_vfprintf (&tmpfil.file, format, arg); _IO_FINISH (&tmpfil.file); return done; }
void _IO_cookie_init (struct _IO_cookie_file *cfile, int read_write, void *cookie, _IO_cookie_io_functions_t io_functions) { _IO_init_internal (&cfile->__fp.file, 0); _IO_JUMPS (&cfile->__fp) = &_IO_cookie_jumps; cfile->__cookie = cookie; set_callbacks (&cfile->__io_functions, io_functions); _IO_new_file_init_internal (&cfile->__fp); _IO_mask_flags (&cfile->__fp.file, read_write, _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); /* We use a negative number different from -1 for _fileno to mark that this special stream is not associated with a real file, but still has to be treated as such. */ cfile->__fp.file._fileno = -2; }
/* External version of _IO_new_file_init_internal which switches off vtable validation. */ void _IO_new_file_init (struct _IO_FILE_plus *fp) { IO_set_accept_foreign_vtables (&_IO_vtable_check); _IO_new_file_init_internal (fp); }
_IO_FILE * _IO_new_fdopen (int fd, const char *mode) { int read_write; struct locked_FILE { struct _IO_FILE_plus fp; #ifdef _IO_MTSAFE_IO _IO_lock_t lock; #endif struct _IO_wide_data wd; } *new_f; int i; int use_mmap = 0; /* Decide whether we modify the offset of the file we attach to and seek to the end of file. We only do this if the mode is 'a' and if the file descriptor did not have O_APPEND in its flags already. */ bool do_seek = false; switch (*mode) { case 'r': read_write = _IO_NO_WRITES; break; case 'w': read_write = _IO_NO_READS; break; case 'a': read_write = _IO_NO_READS|_IO_IS_APPENDING; break; default: MAYBE_SET_EINVAL; return NULL; } for (i = 1; i < 5; ++i) { switch (*++mode) { case '\0': break; case '+': read_write &= _IO_IS_APPENDING; break; case 'm': use_mmap = 1; continue; case 'x': case 'b': default: /* Ignore */ continue; } break; } #ifdef F_GETFL int fd_flags = _IO_fcntl (fd, F_GETFL); #ifndef O_ACCMODE #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) #endif if (fd_flags == -1) return NULL; if (((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES)) || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS))) { MAYBE_SET_EINVAL; return NULL; } /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b) [System Application Program Interface (API) Amendment 1: Realtime Extensions], Rationale B.8.3.3 Open a Stream on a File Descriptor says: Although not explicitly required by POSIX.1, a good implementation of append ("a") mode would cause the O_APPEND flag to be set. (Historical implementations [such as Solaris2] do a one-time seek in fdopen.) However, we do not turn O_APPEND off if the mode is "w" (even though that would seem consistent) because that would be more likely to break historical programs. */ if ((read_write & _IO_IS_APPENDING) && !(fd_flags & O_APPEND)) { do_seek = true; #ifdef F_SETFL if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1) #endif return NULL; } #endif new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); if (new_f == NULL) return NULL; #ifdef _IO_MTSAFE_IO new_f->fp.file._lock = &new_f->lock; #endif _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, #ifdef _G_HAVE_MMAP (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_wfile_jumps_maybe_mmap : #endif &_IO_wfile_jumps); _IO_JUMPS (&new_f->fp) = #ifdef _G_HAVE_MMAP (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap : #endif &_IO_file_jumps; _IO_new_file_init_internal (&new_f->fp); #if !_IO_UNIFIED_JUMPTABLES new_f->fp.vtable = NULL; #endif /* We only need to record the fd because _IO_file_init_internal will have unset the offset. It is important to unset the cached offset because the real offset in the file could change between now and when the handle is activated and we would then mislead ftell into believing that we have a valid offset. */ new_f->fp.file._fileno = fd; new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE; _IO_mask_flags (&new_f->fp.file, read_write, _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); /* For append mode, set the file offset to the end of the file if we added O_APPEND to the file descriptor flags. Don't update the offset cache though, since the file handle is not active. */ if (do_seek && ((read_write & (_IO_IS_APPENDING | _IO_NO_READS)) == (_IO_IS_APPENDING | _IO_NO_READS))) { _IO_off64_t new_pos = _IO_SYSSEEK (&new_f->fp.file, 0, _IO_seek_end); if (new_pos == _IO_pos_BAD && errno != ESPIPE) return NULL; } return &new_f->fp.file; }