Add "harmful" library

base/glibc-compatibility/musl/lgamma.c

@@ -258,11 +258,3 @@ double lgamma_r(double x, int *signgamp)
 		r = nadj - r;
 	return r;
 }
-
-
-int signgam;
-
-double lgamma(double x)
-{
-	return lgamma_r(x, &signgam);
-}

base/glibc-compatibility/musl/lgammal.c

@@ -328,12 +328,3 @@ long double lgammal_r(long double x, int *sg)
 	return lgamma_r(x, sg);
 }
 #endif
-
-
-int signgam_lgammal;
-
-long double lgammal(long double x)
-{
-	return lgammal_r(x, &signgam_lgammal);
-}
-

base/harmful/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_library(harmful harmful.c)
+target_link_libraries(global-libs INTERFACE harmful)
+install(TARGETS harmful EXPORT global ARCHIVE DESTINATION lib)

base/harmful/README.md

@@ -0,0 +1 @@
+A library that traps whenever harmful functions from libc are called.

base/harmful/harmful.c

@@ -0,0 +1,89 @@
+#pragma GCC diagnostic ignored "-Wincompatible-library-redeclaration"
+
+#define TRAP(func) void func() { __builtin_trap(); }
+
+/// Trap all non thread-safe functions:
+/// nm -D /lib/x86_64-linux-gnu/{libc.so.6,libdl.so.2,libm.so.6,libpthread.so.0,librt.so.1,libnss_dns.so.2,libresolv.so.2} | grep -P '_r@?$' | awk '{ print $3 }' | sed -r -e 's/_r//' | grep -vP '^_'
+
+TRAP(asctime)
+TRAP(ctime)
+TRAP(drand48)
+TRAP(ecvt)
+TRAP(erand48)
+TRAP(ether_aton)
+TRAP(ether_ntoa)
+TRAP(fcvt)
+TRAP(fgetgrent)
+TRAP(fgetpwent)
+TRAP(fgetsgent)
+TRAP(fgetspent)
+TRAP(getaliasbyname)
+TRAP(getaliasent)
+TRAP(getdate)
+TRAP(getgrent)
+TRAP(getgrgid)
+TRAP(getgrnam)
+TRAP(gethostbyaddr)
+TRAP(gethostbyname2)
+TRAP(gethostbyname)
+TRAP(gethostent)
+TRAP(getlogin)
+TRAP(getmntent)
+TRAP(getnetbyaddr)
+TRAP(getnetbyname)
+TRAP(getnetent)
+TRAP(getnetgrent)
+TRAP(getprotobyname)
+TRAP(getprotobynumber)
+TRAP(getprotoent)
+TRAP(getpwent)
+TRAP(getpwnam)
+TRAP(getpwuid)
+TRAP(getrpcbyname)
+TRAP(getrpcbynumber)
+TRAP(getrpcent)
+TRAP(getservbyname)
+TRAP(getservbyport)
+TRAP(getservent)
+TRAP(getsgent)
+TRAP(getsgnam)
+TRAP(getspent)
+TRAP(getspnam)
+TRAP(getutent)
+TRAP(getutid)
+TRAP(getutline)
+TRAP(gmtime)
+TRAP(hcreate)
+TRAP(hdestroy)
+TRAP(hsearch)
+TRAP(initstate)
+TRAP(jrand48)
+TRAP(lcong48)
+TRAP(localtime)
+TRAP(lrand48)
+TRAP(mrand48)
+TRAP(nrand48)
+TRAP(ptsname)
+TRAP(qecvt)
+TRAP(qfcvt)
+TRAP(random)
+TRAP(rand)
+TRAP(seed48)
+TRAP(setstate)
+TRAP(sgetsgent)
+TRAP(sgetspent)
+TRAP(srand48)
+TRAP(srandom)
+TRAP(strerror)
+TRAP(strtok)
+TRAP(tmpnam)
+TRAP(ttyname)
+TRAP(twalk)
+TRAP(lgammaf128)
+TRAP(lgammaf32)
+TRAP(lgammaf32x)
+TRAP(lgammaf64)
+TRAP(lgammaf64x)
+TRAP(lgammaf)
+TRAP(lgammal)
+TRAP(lgamma)

cmake/linux/default_libs.cmake

@@ -43,6 +43,7 @@ find_package(Threads REQUIRED)
 if (NOT OS_ANDROID)
     # Our compatibility layer doesn't build under Android, many errors in musl.
     add_subdirectory(base/glibc-compatibility)
+    add_subdirectory(base/harmful)
 endif ()
 
 include (cmake/find/unwind.cmake)