MINOR: tools: use public interface for FreeBSD get_exec_path()

Where possible (FreeBSD 13+), use the public, documented interface to
the ELF auxiliary argument vector: elf_aux_info().

__elf_aux_vector is a private interface exported so that the runtime
linker can set its value during process startup and not intended for
public consumption.  In FreeBSD 15 it has been removed from libc and
moved to libsys.

diff --git a/src/tools.c b/src/tools.c
index e1ba2411ef897ae36e2931b06a24947d3aec7d69..475922283b02990252babc0da71ac9e719cb252b 100644 (file)
--- a/src/tools.c
+++ b/src/tools.c
@@ -17,9 +17,14 @@
 #endif
 
 #if defined(__FreeBSD__)
+#include <sys/param.h>
+#if __FreeBSD_version < 1300058
 #include <elf.h>
 #include <dlfcn.h>
 extern void *__elf_aux_vector;
+#else
+#include <sys/auxv.h>
+#endif
 #endif
 
 #if defined(__NetBSD__)
@@ -5018,6 +5023,7 @@ const char *get_exec_path()
        if (execfn && execfn != ENOENT)
                ret = (const char *)execfn;
 #elif defined(__FreeBSD__)
+#if __FreeBSD_version < 1300058
        Elf_Auxinfo *auxv;
        for (auxv = __elf_aux_vector; auxv->a_type != AT_NULL; ++auxv) {
                if (auxv->a_type == AT_EXECPATH) {
@@ -5025,6 +5031,14 @@ const char *get_exec_path()
                        break;
                }
        }
+#else
+       static char execpath[MAXPATHLEN];
+
+       if (execpath[0] == '\0')
+               elf_aux_info(AT_EXECPATH, execpath, MAXPATHLEN);
+       if (execpath[0] != '\0')
+               ret = execpath;
+#endif
 #elif defined(__NetBSD__)
        AuxInfo *auxv;
        for (auxv = _dlauxinfo(); auxv->a_type != AT_NULL; ++auxv) {