diff options
| author | fanquake <fanquake@gmail.com> | 2020-03-16 17:20:27 +0800 |
|---|---|---|
| committer | fanquake <fanquake@gmail.com> | 2020-03-19 11:36:38 +0800 |
| commit | e90e3e684ffa7b25f0dfb5b45e70bb0c358261fb (patch) | |
| tree | eff47e78032a33a1e4807b32c771b784a34437a5 | |
| parent | a421e0a22f1230abd69b4661a019bed39b72205f (diff) | |
build: fix sysctl() detection on macOS
sysctl() on *BSD takes a "const int *name", whereas sysctl() on macOS
it takes an "int *name". So our configure check and sysctl() detection on
macOS currently fails:
```bash
/usr/include/sys/sysctl.h:759:9: note: candidate function not viable:
no known conversion from 'const int [2]' to 'int *' for 1st argument
int sysctl(int *, u_int, void *, size_t *, void *, size_t);
```
This change removes the name argument from the sysctl() detection check,
meaning we will detect correctly on macOS and *BSD.
For consistency we also switch to using the more generic, non-const
version of the name parameter in the rest of our usage.
| -rw-r--r-- | configure.ac | 10 | ||||
| -rw-r--r-- | src/random.cpp | 4 |
2 files changed, 8 insertions, 6 deletions
diff --git a/configure.ac b/configure.ac index 758d31192b..23a6417a1a 100644 --- a/configure.ac +++ b/configure.ac @@ -935,11 +935,10 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <unistd.h> AC_MSG_CHECKING(for sysctl) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h> #include <sys/sysctl.h>]], - [[ static const int name[2] = {CTL_KERN, KERN_VERSION}; - #ifdef __linux__ + [[ #ifdef __linux__ #error "Don't use sysctl on Linux, it's deprecated even when it works" #endif - sysctl(name, 2, nullptr, nullptr, nullptr, 0); ]])], + sysctl(nullptr, 2, nullptr, nullptr, nullptr, 0); ]])], [ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSCTL, 1,[Define this symbol if the BSD sysctl() is available]) ], [ AC_MSG_RESULT(no)] ) @@ -947,7 +946,10 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h> AC_MSG_CHECKING(for sysctl KERN_ARND) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h> #include <sys/sysctl.h>]], - [[ static const int name[2] = {CTL_KERN, KERN_ARND}; + [[ #ifdef __linux__ + #error "Don't use sysctl on Linux, it's deprecated even when it works" + #endif + static int name[2] = {CTL_KERN, KERN_ARND}; sysctl(name, 2, nullptr, nullptr, nullptr, 0); ]])], [ AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSCTL_ARND, 1,[Define this symbol if the BSD sysctl(KERN_ARND) is available]) ], [ AC_MSG_RESULT(no)] diff --git a/src/random.cpp b/src/random.cpp index f7f3dd9de3..2a27e6ba0d 100644 --- a/src/random.cpp +++ b/src/random.cpp @@ -321,10 +321,10 @@ void GetOSRand(unsigned char *ent32) RandFailure(); } #elif defined(HAVE_SYSCTL_ARND) - /* FreeBSD and similar. It is possible for the call to return less + /* FreeBSD, NetBSD and similar. It is possible for the call to return less * bytes than requested, so need to read in a loop. */ - static const int name[2] = {CTL_KERN, KERN_ARND}; + static int name[2] = {CTL_KERN, KERN_ARND}; int have = 0; do { size_t len = NUM_OS_RANDOM_BYTES - have; |