4 files changed, 145 insertions, 3 deletions
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 5da23c944..3b1eb6d23 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -50,6 +50,10 @@ if (STACK_TRACE)
   list(APPEND common_sources stack_trace.cpp)
 endif()
 
+if (BACKCOMPAT)
+  list(APPEND common_sources compat/glibc_compat.cpp)
+endif()
+
 set(common_headers)
 
 set(common_private_headers
diff --git a/src/common/compat/glibc_compat.cpp b/src/common/compat/glibc_compat.cpp
new file mode 100644
index 000000000..bf567987d
--- /dev/null
+++ b/src/common/compat/glibc_compat.cpp
@@ -0,0 +1,98 @@
+#include <cstddef>
+#include <cstdint>
+#include <strings.h>
+#include <string.h>
+#include <glob.h>
+#include <unistd.h>
+#include <fnmatch.h>
+
+#if defined(HAVE_SYS_SELECT_H)
+#include <sys/select.h>
+#endif
+
+// Prior to GLIBC_2.14, memcpy was aliased to memmove.
+extern "C" void* memmove(void* a, const void* b, size_t c);
+//extern "C" void* memset(void* a, int b, long unsigned int c);
+extern "C" void* memcpy(void* a, const void* b, size_t c)
+{
+    return memmove(a, b, c);
+}
+
+extern "C" void __chk_fail(void) __attribute__((__noreturn__));
+
+#if defined(__i386__) || defined(__arm__)
+
+extern "C" int64_t __udivmoddi4(uint64_t u, uint64_t v, uint64_t* rp);
+
+extern "C" int64_t __wrap___divmoddi4(int64_t u, int64_t v, int64_t* rp)
+{
+    int32_t c1 = 0, c2 = 0;
+    int64_t uu = u, vv = v;
+    int64_t w;
+    int64_t r;
+
+    if (uu < 0) {
+        c1 = ~c1, c2 = ~c2, uu = -uu;
+    }
+    if (vv < 0) {
+        c1 = ~c1, vv = -vv;
+    }
+
+    w = __udivmoddi4(uu, vv, (uint64_t*)&r);
+    if (c1)
+        w = -w;
+    if (c2)
+        r = -r;
+
+    *rp = r;
+    return w;
+}
+#endif
+
+/* glibc-internal users use __explicit_bzero_chk, and explicit_bzero
+   redirects to that.  */
+#undef explicit_bzero
+/* Set LEN bytes of S to 0.  The compiler will not delete a call to
+   this function, even if S is dead after the call.  */
+void
+explicit_bzero (void *s, size_t len)
+{
+  memset (s, '\0', len);
+  /* Compiler barrier.  */
+  asm volatile ("" ::: "memory");
+}
+
+// Redefine explicit_bzero_chk
+void
+__explicit_bzero_chk (void *dst, size_t len, size_t dstlen)
+{
+  /* Inline __memset_chk to avoid a PLT reference to __memset_chk.  */
+  if (__glibc_unlikely (dstlen < len))
+    __chk_fail ();
+  memset (dst, '\0', len);
+  /* Compiler barrier.  */
+  asm volatile ("" ::: "memory");
+}
+/* libc-internal references use the hidden
+   __explicit_bzero_chk_internal symbol.  This is necessary if
+   __explicit_bzero_chk is implemented as an IFUNC because some
+   targets do not support hidden references to IFUNC symbols.  */
+#define strong_alias (__explicit_bzero_chk, __explicit_bzero_chk_internal)
+
+#undef glob
+extern "C" int glob_old(const char * pattern, int flags, int (*errfunc) (const char *epath, int eerrno), glob_t *pglob);
+#ifdef __i386__
+__asm__(".symver glob_old,glob@GLIBC_2.1");
+#elif defined(__amd64__)
+__asm__(".symver glob_old,glob@GLIBC_2.2.5");
+#elif defined(__arm__)
+__asm(".symver glob_old,glob@GLIBC_2.4");
+#elif defined(__aarch64__)
+__asm__(".symver glob_old,glob@GLIBC_2.17");
+#endif
+
+extern "C" int __wrap_glob(const char * pattern, int flags, int (*errfunc) (const char *epath, int eerrno), glob_t *pglob)
+{
+    return glob_old(pattern, flags, errfunc, pglob);
+}
+
diff --git a/src/common/util.cpp b/src/common/util.cpp
index 58b0d8210..28745eea4 100644
--- a/src/common/util.cpp
+++ b/src/common/util.cpp
@@ -58,6 +58,7 @@
 #include "include_base_utils.h"
 #include "file_io_utils.h"
 #include "wipeable_string.h"
+#include "misc_os_dependent.h"
 using namespace epee;
 
 #include "crypto/crypto.h"
@@ -81,6 +82,32 @@ using namespace epee;
 #include <boost/asio.hpp>
 #include <openssl/sha.h>
 
+#undef MONERO_DEFAULT_LOG_CATEGORY
+#define MONERO_DEFAULT_LOG_CATEGORY "util"
+
+namespace
+{
+
+#ifndef _WIN32
+static int flock_exnb(int fd)
+{
+  struct flock fl;
+  int ret;
+
+  memset(&fl, 0, sizeof(fl));
+  fl.l_type = F_WRLCK;
+  fl.l_whence = SEEK_SET;
+  fl.l_start = 0;
+  fl.l_len = 0;
+  ret = fcntl(fd, F_SETLK, &fl);
+  if (ret < 0)
+    MERROR("Error locking fd " << fd << ": " << errno << " (" << strerror(errno) << ")");
+  return ret;
+}
+#endif
+
+}
+
 namespace tools
 {
   std::function<void(int)> signal_handler::m_handler;
@@ -181,7 +208,7 @@ namespace tools
         struct stat wstats = {};
         if (fstat(fdw, std::addressof(wstats)) == 0 &&
             rstats.st_dev == wstats.st_dev && rstats.st_ino == wstats.st_ino &&
-            flock(fdw, (LOCK_EX | LOCK_NB)) == 0 && ftruncate(fdw, 0) == 0)
+            flock_exnb(fdw) == 0 && ftruncate(fdw, 0) == 0)
         {
           std::FILE* file = fdopen(fdw, "w");
           if (file) return {file, std::move(name)};
@@ -234,10 +261,10 @@ namespace tools
       MERROR("Failed to open " << filename << ": " << std::error_code(GetLastError(), std::system_category()));
     }
 #else
-    m_fd = open(filename.c_str(), O_RDONLY | O_CREAT | O_CLOEXEC, 0666);
+    m_fd = open(filename.c_str(), O_RDWR | O_CREAT | O_CLOEXEC, 0666);
     if (m_fd != -1)
     {
-      if (flock(m_fd, LOCK_EX | LOCK_NB) == -1)
+      if (flock_exnb(m_fd) == -1)
       {
         MERROR("Failed to lock " << filename << ": " << std::strerror(errno));
         close(m_fd);
@@ -1025,4 +1052,15 @@ std::string get_nix_version_display_string()
 #endif
   }
 
+  std::string get_human_readable_timestamp(uint64_t ts)
+  {
+    char buffer[64];
+    if (ts < 1234567890)
+      return "<unknown>";
+    time_t tt = ts;
+    struct tm tm;
+    misc_utils::get_gmt_time(tt, tm);
+    strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", &tm);
+    return std::string(buffer);
+  }
 }
diff --git a/src/common/util.h b/src/common/util.h
index 1c5c5f4e7..d5aca15d1 100644
--- a/src/common/util.h
+++ b/src/common/util.h
@@ -242,4 +242,6 @@ namespace tools
 #endif
 
   void closefrom(int fd);
+
+  std::string get_human_readable_timestamp(uint64_t ts);
 }