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* [gcc r14-289] libstdc++: Make std::random_device throw std::system_error [PR105081]
@ 2023-04-27 10:29 Jonathan Wakely
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From: Jonathan Wakely @ 2023-04-27 10:29 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:f9412cedd6c0e7417b30d9a80d3f45c8746223b4
commit r14-289-gf9412cedd6c0e7417b30d9a80d3f45c8746223b4
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Apr 26 15:23:57 2023 +0100
libstdc++: Make std::random_device throw std::system_error [PR105081]
This changes std::random_device constructors to throw std::system_error
(with EINVAL as the error code) when the constructor argument is
invalid. We can also throw std::system_error when read(2) fails so that
the exception includes the additional information provided by errno.
As noted in the PR, this is consistent with libc++, and doesn't break
any existing code which catches std::runtime_error, because those
handlers will still catch std::system_error.
libstdc++-v3/ChangeLog:
PR libstdc++/105081
* src/c++11/random.cc (__throw_syserr): New function.
(random_device::_M_init, random_device::_M_init_pretr1): Use new
function for bad tokens.
(random_device::_M_getval): Use new function for read errors.
* testsuite/util/testsuite_random.h (random_device_available):
Change catch handler to use std::system_error.
Diff:
---
libstdc++-v3/src/c++11/random.cc | 18 ++++++++++++------
libstdc++-v3/testsuite/util/testsuite_random.h | 3 ++-
2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/libstdc++-v3/src/c++11/random.cc b/libstdc++-v3/src/c++11/random.cc
index ed2db4aef57..daf934808cc 100644
--- a/libstdc++-v3/src/c++11/random.cc
+++ b/libstdc++-v3/src/c++11/random.cc
@@ -26,6 +26,7 @@
#define _CRT_RAND_S // define this before including <stdlib.h> to get rand_s
#include <random>
+#include <system_error>
#ifdef _GLIBCXX_USE_C99_STDINT_TR1
@@ -94,6 +95,11 @@ namespace std _GLIBCXX_VISIBILITY(default)
{
namespace
{
+ [[noreturn]]
+ inline void
+ __throw_syserr([[maybe_unused]] int e, [[maybe_unused]] const char* msg)
+ { _GLIBCXX_THROW_OR_ABORT(system_error(e, std::generic_category(), msg)); }
+
#if USE_RDRAND
unsigned int
__attribute__ ((target("rdrnd")))
@@ -365,9 +371,9 @@ namespace std _GLIBCXX_VISIBILITY(default)
which = prng;
#endif
else
- std::__throw_runtime_error(
- __N("random_device::random_device(const std::string&):"
- " unsupported token"));
+ std::__throw_syserr(EINVAL, __N("random_device::random_device"
+ "(const std::string&):"
+ " unsupported token"));
#ifdef _GLIBCXX_USE_CRT_RAND_S
if (which & rand_s)
@@ -508,8 +514,8 @@ namespace std _GLIBCXX_VISIBILITY(default)
char* endptr;
seed = std::strtoul(nptr, &endptr, 0);
if (*nptr == '\0' || *endptr != '\0')
- std::__throw_runtime_error(__N("random_device::_M_init_pretr1"
- "(const std::string&)"));
+ std::__throw_syserr(EINVAL, __N("random_device::_M_init_pretr1"
+ "(const std::string&)"));
}
_M_mt.seed(seed);
#else
@@ -582,7 +588,7 @@ namespace std _GLIBCXX_VISIBILITY(default)
p = static_cast<char*>(p) + e;
}
else if (e != -1 || errno != EINTR)
- __throw_runtime_error(__N("random_device could not be read"));
+ __throw_syserr(errno, __N("random_device could not be read"));
}
while (n > 0);
#else // USE_POSIX_FILE_IO
diff --git a/libstdc++-v3/testsuite/util/testsuite_random.h b/libstdc++-v3/testsuite/util/testsuite_random.h
index 840294d01e1..763707bbfac 100644
--- a/libstdc++-v3/testsuite/util/testsuite_random.h
+++ b/libstdc++-v3/testsuite/util/testsuite_random.h
@@ -26,6 +26,7 @@
#include <cmath>
#include <initializer_list>
+#include <system_error>
#include <testsuite_hooks.h>
namespace __gnu_test
@@ -204,7 +205,7 @@ namespace __gnu_test
try {
std::random_device dev(token);
return true;
- } catch (...) {
+ } catch (const std::system_error& /* See PR libstdc++/105081 */) {
return false;
}
}
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