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Diffstat (limited to 'manual/debug.texi')
| -rw-r--r-- | manual/debug.texi | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/manual/debug.texi b/manual/debug.texi index 0fe1e3e..c29f626 100644 --- a/manual/debug.texi +++ b/manual/debug.texi @@ -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. |