mirror of
https://github.com/autc04/Retro68.git
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373 lines
12 KiB
Plaintext
373 lines
12 KiB
Plaintext
@section Opening and closing BFDs
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@subsection Functions for opening and closing
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@findex bfd_fopen
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@subsubsection @code{bfd_fopen}
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@strong{Synopsis}
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@example
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bfd *bfd_fopen (const char *filename, const char *target,
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const char *mode, int fd);
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@end example
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@strong{Description}@*
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Open the file @var{filename} with the target @var{target}.
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Return a pointer to the created BFD. If @var{fd} is not -1,
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then @code{fdopen} is used to open the file; otherwise, @code{fopen}
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is used. @var{mode} is passed directly to @code{fopen} or
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@code{fdopen}.
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Calls @code{bfd_find_target}, so @var{target} is interpreted as by
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that function.
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The new BFD is marked as cacheable iff @var{fd} is -1.
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If @code{NULL} is returned then an error has occured. Possible errors
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are @code{bfd_error_no_memory}, @code{bfd_error_invalid_target} or
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@code{system_call} error.
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@findex bfd_openr
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@subsubsection @code{bfd_openr}
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@strong{Synopsis}
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@example
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bfd *bfd_openr (const char *filename, const char *target);
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@end example
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@strong{Description}@*
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Open the file @var{filename} (using @code{fopen}) with the target
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@var{target}. Return a pointer to the created BFD.
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Calls @code{bfd_find_target}, so @var{target} is interpreted as by
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that function.
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If @code{NULL} is returned then an error has occured. Possible errors
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are @code{bfd_error_no_memory}, @code{bfd_error_invalid_target} or
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@code{system_call} error.
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@findex bfd_fdopenr
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@subsubsection @code{bfd_fdopenr}
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@strong{Synopsis}
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@example
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bfd *bfd_fdopenr (const char *filename, const char *target, int fd);
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@end example
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@strong{Description}@*
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@code{bfd_fdopenr} is to @code{bfd_fopenr} much like @code{fdopen} is to
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@code{fopen}. It opens a BFD on a file already described by the
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@var{fd} supplied.
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When the file is later @code{bfd_close}d, the file descriptor will
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be closed. If the caller desires that this file descriptor be
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cached by BFD (opened as needed, closed as needed to free
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descriptors for other opens), with the supplied @var{fd} used as
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an initial file descriptor (but subject to closure at any time),
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call bfd_set_cacheable(bfd, 1) on the returned BFD. The default
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is to assume no caching; the file descriptor will remain open
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until @code{bfd_close}, and will not be affected by BFD operations
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on other files.
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Possible errors are @code{bfd_error_no_memory},
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@code{bfd_error_invalid_target} and @code{bfd_error_system_call}.
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@findex bfd_openstreamr
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@subsubsection @code{bfd_openstreamr}
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@strong{Synopsis}
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@example
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bfd *bfd_openstreamr (const char *, const char *, void *);
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@end example
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@strong{Description}@*
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Open a BFD for read access on an existing stdio stream. When
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the BFD is passed to @code{bfd_close}, the stream will be closed.
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@findex bfd_openr_iovec
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@subsubsection @code{bfd_openr_iovec}
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@strong{Synopsis}
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@example
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bfd *bfd_openr_iovec (const char *filename, const char *target,
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void *(*open) (struct bfd *nbfd,
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void *open_closure),
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void *open_closure,
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file_ptr (*pread) (struct bfd *nbfd,
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void *stream,
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void *buf,
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file_ptr nbytes,
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file_ptr offset),
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int (*close) (struct bfd *nbfd,
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void *stream),
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int (*stat) (struct bfd *abfd,
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void *stream,
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struct stat *sb));
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@end example
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@strong{Description}@*
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Create and return a BFD backed by a read-only @var{stream}.
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The @var{stream} is created using @var{open}, accessed using
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@var{pread} and destroyed using @var{close}.
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Calls @code{bfd_find_target}, so @var{target} is interpreted as by
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that function.
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Calls @var{open} (which can call @code{bfd_zalloc} and
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@code{bfd_get_filename}) to obtain the read-only stream backing
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the BFD. @var{open} either succeeds returning the
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non-@code{NULL} @var{stream}, or fails returning @code{NULL}
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(setting @code{bfd_error}).
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Calls @var{pread} to request @var{nbytes} of data from
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@var{stream} starting at @var{offset} (e.g., via a call to
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@code{bfd_read}). @var{pread} either succeeds returning the
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number of bytes read (which can be less than @var{nbytes} when
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end-of-file), or fails returning -1 (setting @code{bfd_error}).
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Calls @var{close} when the BFD is later closed using
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@code{bfd_close}. @var{close} either succeeds returning 0, or
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fails returning -1 (setting @code{bfd_error}).
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Calls @var{stat} to fill in a stat structure for bfd_stat,
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bfd_get_size, and bfd_get_mtime calls. @var{stat} returns 0
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on success, or returns -1 on failure (setting @code{bfd_error}).
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If @code{bfd_openr_iovec} returns @code{NULL} then an error has
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occurred. Possible errors are @code{bfd_error_no_memory},
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@code{bfd_error_invalid_target} and @code{bfd_error_system_call}.
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@findex bfd_openw
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@subsubsection @code{bfd_openw}
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@strong{Synopsis}
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@example
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bfd *bfd_openw (const char *filename, const char *target);
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@end example
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@strong{Description}@*
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Create a BFD, associated with file @var{filename}, using the
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file format @var{target}, and return a pointer to it.
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Possible errors are @code{bfd_error_system_call}, @code{bfd_error_no_memory},
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@code{bfd_error_invalid_target}.
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@findex bfd_close
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@subsubsection @code{bfd_close}
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@strong{Synopsis}
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@example
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bfd_boolean bfd_close (bfd *abfd);
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@end example
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@strong{Description}@*
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Close a BFD. If the BFD was open for writing, then pending
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operations are completed and the file written out and closed.
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If the created file is executable, then @code{chmod} is called
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to mark it as such.
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All memory attached to the BFD is released.
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The file descriptor associated with the BFD is closed (even
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if it was passed in to BFD by @code{bfd_fdopenr}).
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_close_all_done
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@subsubsection @code{bfd_close_all_done}
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@strong{Synopsis}
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@example
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bfd_boolean bfd_close_all_done (bfd *);
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@end example
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@strong{Description}@*
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Close a BFD. Differs from @code{bfd_close} since it does not
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complete any pending operations. This routine would be used
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if the application had just used BFD for swapping and didn't
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want to use any of the writing code.
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If the created file is executable, then @code{chmod} is called
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to mark it as such.
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All memory attached to the BFD is released.
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_create
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@subsubsection @code{bfd_create}
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@strong{Synopsis}
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@example
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bfd *bfd_create (const char *filename, bfd *templ);
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@end example
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@strong{Description}@*
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Create a new BFD in the manner of @code{bfd_openw}, but without
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opening a file. The new BFD takes the target from the target
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used by @var{template}. The format is always set to @code{bfd_object}.
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@findex bfd_make_writable
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@subsubsection @code{bfd_make_writable}
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@strong{Synopsis}
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@example
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bfd_boolean bfd_make_writable (bfd *abfd);
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@end example
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@strong{Description}@*
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Takes a BFD as created by @code{bfd_create} and converts it
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into one like as returned by @code{bfd_openw}. It does this
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by converting the BFD to BFD_IN_MEMORY. It's assumed that
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you will call @code{bfd_make_readable} on this bfd later.
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_make_readable
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@subsubsection @code{bfd_make_readable}
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@strong{Synopsis}
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@example
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bfd_boolean bfd_make_readable (bfd *abfd);
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@end example
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@strong{Description}@*
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Takes a BFD as created by @code{bfd_create} and
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@code{bfd_make_writable} and converts it into one like as
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returned by @code{bfd_openr}. It does this by writing the
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contents out to the memory buffer, then reversing the
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direction.
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok, otherwise @code{FALSE}.
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@findex bfd_alloc
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@subsubsection @code{bfd_alloc}
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@strong{Synopsis}
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@example
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void *bfd_alloc (bfd *abfd, bfd_size_type wanted);
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@end example
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@strong{Description}@*
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Allocate a block of @var{wanted} bytes of memory attached to
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@code{abfd} and return a pointer to it.
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@findex bfd_alloc2
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@subsubsection @code{bfd_alloc2}
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@strong{Synopsis}
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@example
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void *bfd_alloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
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@end example
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@strong{Description}@*
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Allocate a block of @var{nmemb} elements of @var{size} bytes each
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of memory attached to @code{abfd} and return a pointer to it.
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@findex bfd_zalloc
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@subsubsection @code{bfd_zalloc}
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@strong{Synopsis}
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@example
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void *bfd_zalloc (bfd *abfd, bfd_size_type wanted);
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@end example
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@strong{Description}@*
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Allocate a block of @var{wanted} bytes of zeroed memory
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attached to @code{abfd} and return a pointer to it.
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@findex bfd_zalloc2
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@subsubsection @code{bfd_zalloc2}
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@strong{Synopsis}
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@example
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void *bfd_zalloc2 (bfd *abfd, bfd_size_type nmemb, bfd_size_type size);
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@end example
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@strong{Description}@*
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Allocate a block of @var{nmemb} elements of @var{size} bytes each
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of zeroed memory attached to @code{abfd} and return a pointer to it.
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@findex bfd_calc_gnu_debuglink_crc32
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@subsubsection @code{bfd_calc_gnu_debuglink_crc32}
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@strong{Synopsis}
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@example
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unsigned long bfd_calc_gnu_debuglink_crc32
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(unsigned long crc, const unsigned char *buf, bfd_size_type len);
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@end example
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@strong{Description}@*
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Computes a CRC value as used in the .gnu_debuglink section.
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Advances the previously computed @var{crc} value by computing
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and adding in the crc32 for @var{len} bytes of @var{buf}.
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@strong{Returns}@*
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Return the updated CRC32 value.
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@findex get_debug_link_info
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@subsubsection @code{get_debug_link_info}
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@strong{Synopsis}
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@example
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char *get_debug_link_info (bfd *abfd, unsigned long *crc32_out);
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@end example
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@strong{Description}@*
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fetch the filename and CRC32 value for any separate debuginfo
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associated with @var{abfd}. Return NULL if no such info found,
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otherwise return filename and update @var{crc32_out}.
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@findex separate_debug_file_exists
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@subsubsection @code{separate_debug_file_exists}
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@strong{Synopsis}
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@example
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bfd_boolean separate_debug_file_exists
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(char *name, unsigned long crc32);
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@end example
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@strong{Description}@*
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Checks to see if @var{name} is a file and if its contents
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match @var{crc32}.
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@findex find_separate_debug_file
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@subsubsection @code{find_separate_debug_file}
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@strong{Synopsis}
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@example
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char *find_separate_debug_file (bfd *abfd);
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@end example
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@strong{Description}@*
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Searches @var{abfd} for a reference to separate debugging
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information, scans various locations in the filesystem, including
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the file tree rooted at @var{debug_file_directory}, and returns a
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filename of such debugging information if the file is found and has
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matching CRC32. Returns NULL if no reference to debugging file
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exists, or file cannot be found.
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@findex bfd_follow_gnu_debuglink
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@subsubsection @code{bfd_follow_gnu_debuglink}
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@strong{Synopsis}
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@example
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char *bfd_follow_gnu_debuglink (bfd *abfd, const char *dir);
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@end example
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@strong{Description}@*
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Takes a BFD and searches it for a .gnu_debuglink section. If this
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section is found, it examines the section for the name and checksum
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of a '.debug' file containing auxiliary debugging information. It
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then searches the filesystem for this .debug file in some standard
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locations, including the directory tree rooted at @var{dir}, and if
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found returns the full filename.
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If @var{dir} is NULL, it will search a default path configured into
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libbfd at build time. [XXX this feature is not currently
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implemented].
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@strong{Returns}@*
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@code{NULL} on any errors or failure to locate the .debug file,
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otherwise a pointer to a heap-allocated string containing the
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filename. The caller is responsible for freeing this string.
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@findex bfd_create_gnu_debuglink_section
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@subsubsection @code{bfd_create_gnu_debuglink_section}
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@strong{Synopsis}
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@example
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struct bfd_section *bfd_create_gnu_debuglink_section
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(bfd *abfd, const char *filename);
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@end example
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@strong{Description}@*
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Takes a @var{BFD} and adds a .gnu_debuglink section to it. The section is sized
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to be big enough to contain a link to the specified @var{filename}.
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@strong{Returns}@*
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A pointer to the new section is returned if all is ok. Otherwise @code{NULL} is
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returned and bfd_error is set.
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@findex bfd_fill_in_gnu_debuglink_section
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@subsubsection @code{bfd_fill_in_gnu_debuglink_section}
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@strong{Synopsis}
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@example
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bfd_boolean bfd_fill_in_gnu_debuglink_section
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(bfd *abfd, struct bfd_section *sect, const char *filename);
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@end example
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@strong{Description}@*
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Takes a @var{BFD} and containing a .gnu_debuglink section @var{SECT}
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and fills in the contents of the section to contain a link to the
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specified @var{filename}. The filename should be relative to the
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current directory.
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@strong{Returns}@*
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@code{TRUE} is returned if all is ok. Otherwise @code{FALSE} is returned
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and bfd_error is set.
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