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.TH "UNW\\_SET\\_ITERATE\\_PHDR\\_FUNCTION" "3libunwind" "29 August 2023" "Programming Library " "Programming Library "
.SH NAME
unw_set_iterate_phdr_function
\-\- set dl_iterate_phdr
implementation 
.PP
.SH SYNOPSIS

.PP
#include <libunwind.h>
.br
.PP
typedef int
(*unw_iterate_phdr_callback_t)(struct dl_phdr_info *,
size_t,
void *);
.br
typedef int
(*unw_iterate_phdr_func_t)(unw_iterate_phdr_callback_t,
void *);
.br
.PP
void
unw_set_iterate_phdr_function(unw_addr_space_t
as,
unw_iterate_phdr_func_t
function);
.br
.PP
.SH DESCRIPTION

.PP
The unw_set_iterate_phdr_function()
routine sets the dl_iterate_phdr
implementation of address space as
to the function by argument function\&.
The function
will be called whenever libunwind
needs to iterate over the program headers of the application. 
This is normally done by calling dl_iterate_phdr,
but this function is not signal safe. 
With the help of a custom implementation caching and iterating over the program headers is also possible in an signal\-safe manner. 
Though the burden lies on the user of libunwind\&.
.PP
.SH THREAD AND SIGNAL SAFETY

.PP
unw_set_iterate_phdr_function()
is thread safe. If the local address space 
is passed in argument as,
this routine is also safe to use from 
a signal handler. 
.PP
.SH SEE ALSO

.PP
libunwind(3libunwind),
unw_create_addr_space(3libunwind),
dl_iterate_phdr(3libunwind),
.PP
.SH AUTHOR

.PP
Bert Wesarg
.br
Email: \fBbert.wesarg@googlemail.com\fP
.br
WWW: \fBhttp://www.nongnu.org/libunwind/\fP\&.
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