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Improved the wording.

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Ulrich Drepper 2001-02-12 20:15:14 +00:00
parent 2632a4ccb4
commit f6b02eff0d
1 changed files with 17 additions and 17 deletions
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34
manual/debug.texi
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@ -3,12 +3,12 @@
@c %MENU% Functions to help debugging applications.
@chapter Debugging support
Applications often get debugged using dedicated debugger programs. But
sometimes this is not possible and it is in any case useful to provide
the developer at the time the problems are experienced with as much
information as possible. For this reason there exist a few functions
which a program can use to help the developer more easily locate the
problem.
Applications are usually debugged using dedicated debugger programs.
But sometimes this is not possible and, in any case, it is useful to
provide the developer with as much information as possible at the time
the problems are experienced. For this reason a few functions are
provided which a program can use to help the developer more easily
locate the problem.
@menu
@ -39,9 +39,9 @@ and manipulate backtraces of the current thread.
The @code{backtrace} function obtains a backtrace for the current
thread, as a list of pointers, and places the information into
@var{buffer}. The argument @var{size} should be the number of
@w{@code{void *}} elements fitting into @var{buffer}. The return value
is the actual number of entries of @var{buffer} that are obtained, and
is at most @var{size}.
@w{@code{void *}} elements that will fit into @var{buffer}. The return
value is the actual number of entries of @var{buffer} that are obtained,
and is at most @var{size}.
The pointers placed in @var{buffer} are actually return addresses
obtained by inspecting the stack, one return address per stack frame.
@ -67,19 +67,19 @@ The return value is a pointer to an array of strings, which has
contains a printable representation of the corresponding element of
@var{buffer}. It includes the function name (if this can be
determined), an offset into the function, and the actual return address
(in hexidecimal).
(in hexadecimal).
Currently, the function name and offset can currently only be obtained
on systems that use the ELF binary format for programs and libraries.
On other systems, only the hexidecimal return address will be present.
Also, you may need to pass additional flags to the linker
(@code{-rdynamic} on systems using GNU ld) to make the function names
available to the program.
Currently, the function name and offset only be obtained on systems that
use the ELF binary format for programs and libraries. On other systems,
only the hexadecimal return address will be present. Also, you may need
to pass additional flags to the linker to make the function names
available to the program. (For example, on systems using GNU ld, you
must pass (@code{-rdynamic}.)
The return value of @code{backtrace_symbols} is a pointer obtained via
the @code{malloc} function, and it is the responsibility of the caller
to @code{free} that pointer. Note that only the return value need be
freed, but not the individual strings.
freed, not the individual strings.
The return value is @code{NULL} if sufficient memory for the strings
cannot be obtained.