Build the process submodule with musl to add support to missing process spawn functions.

Author: juj

src/library_syscall.js

@@ -211,6 +211,10 @@ var SyscallsLibrary = {
     Module['exit'](status);
     return 0;
   },
+  __syscall2: function(which, varargs) { // fork
+    ___setErrNo(ERRNO_CODES.ENOSYS);
+    return -1;
+  },
   __syscall3: function(which, varargs) { // read
     var stream = SYSCALLS.getStreamFromFD(), buf = SYSCALLS.get(), count = SYSCALLS.get();
     return FS.read(stream, {{{ makeGetSlabs('buf', 'i8', true) }}}, buf, count);
@@ -238,6 +242,10 @@ var SyscallsLibrary = {
     FS.unlink(path);
     return 0;
   },
+  __syscall11: function(which, varargs) { // execve
+    ___setErrNo(ERRNO_CODES.ENOSYS);
+    return -1;
+  },
   __syscall12: function(which, varargs) { // chdir
     var path = SYSCALLS.getStr();
     FS.chdir(path);
@@ -1053,6 +1061,10 @@ var SyscallsLibrary = {
   __syscall272: function(which, varargs) { // fadvise64_64
     return 0; // your advice is important to us (but we can't use it)
   },
+  __syscall284: function(which, varargs) { // waitid
+    ___setErrNo(ERRNO_CODES.ENOSYS);
+    return -1;
+  },
   __syscall295: function(which, varargs) { // openat
 #if SYSCALL_DEBUG
     Module.printErr('warning: untested syscall');

system/lib/libc.symbols

@@ -837,10 +837,10 @@
          T posix_madvise
          W posix_memalign
          T posix_openpt
-         U posix_spawn
-         U posix_spawn_file_actions_adddup2
-         U posix_spawn_file_actions_destroy
-         U posix_spawn_file_actions_init
+         T posix_spawn
+         T posix_spawn_file_actions_adddup2
+         T posix_spawn_file_actions_destroy
+         T posix_spawn_file_actions_init
          W pow10
          W pow10f
          W pow10l

system/lib/libc/musl/arch/emscripten/syscall_arch.h

@@ -27,12 +27,14 @@
 // static syscalls. we must have one non-variadic argument before the rest due to ISO C.
 
 long __syscall1(int which, ...);
+long __syscall2(int which, ...);
 long __syscall3(int which, ...);
 long __syscall4(int which, ...);
 long __syscall5(int which, ...);
 long __syscall6(int which, ...);
 long __syscall9(int which, ...);
 long __syscall10(int which, ...);
+long __syscall11(int which, ...);
 long __syscall12(int which, ...);
 long __syscall14(int which, ...);
 long __syscall15(int which, ...);
@@ -107,6 +109,8 @@ long __syscall208(int which, ...);
 long __syscall209(int which, ...);
 long __syscall211(int which, ...);
 long __syscall212(int which, ...);
+long __syscall213(int which, ...);
+long __syscall214(int which, ...);
 long __syscall218(int which, ...);
 long __syscall219(int which, ...);
 long __syscall220(int which, ...);
@@ -116,6 +120,7 @@ long __syscall265(int which, ...);
 long __syscall268(int which, ...);
 long __syscall269(int which, ...);
 long __syscall272(int which, ...);
+long __syscall284(int which, ...);
 long __syscall295(int which, ...);
 long __syscall296(int which, ...);
 long __syscall297(int which, ...);

tools/system_libs.py

@@ -93,7 +93,7 @@ def create_libc(libname):
     ]
     musl_srcdir = shared.path_from_root('system', 'lib', 'libc', 'musl', 'src')
     blacklist = set(
-      ['ipc', 'passwd', 'thread', 'signal', 'sched', 'ipc', 'time', 'linux', 'aio', 'exit', 'legacy', 'mq', 'process', 'search', 'setjmp', 'env', 'ldso', 'conf'] + # musl modules
+      ['ipc', 'passwd', 'thread', 'signal', 'sched', 'ipc', 'time', 'linux', 'aio', 'exit', 'legacy', 'mq', 'search', 'setjmp', 'env', 'ldso', 'conf'] + # musl modules
       ['memcpy.c', 'memset.c', 'memmove.c', 'getaddrinfo.c', 'getnameinfo.c', 'inet_addr.c', 'res_query.c', 'gai_strerror.c', 'proto.c', 'gethostbyaddr.c', 'gethostbyaddr_r.c', 'gethostbyname.c', 'gethostbyname2_r.c', 'gethostbyname_r.c', 'gethostbyname2.c', 'usleep.c', 'alarm.c', 'syscall.c'] + # individual files
       ['abs.c', 'cos.c', 'cosf.c', 'cosl.c', 'sin.c', 'sinf.c', 'sinl.c', 'tan.c', 'tanf.c', 'tanl.c', 'acos.c', 'acosf.c', 'acosl.c', 'asin.c', 'asinf.c', 'asinl.c', 'atan.c', 'atanf.c', 'atanl.c', 'atan2.c', 'atan2f.c', 'atan2l.c', 'exp.c', 'expf.c', 'expl.c', 'log.c', 'logf.c', 'logl.c', 'sqrt.c', 'sqrtf.c', 'sqrtl.c', 'fabs.c', 'fabsf.c', 'fabsl.c', 'ceil.c', 'ceilf.c', 'ceill.c', 'floor.c', 'floorf.c', 'floorl.c', 'pow.c', 'powf.c', 'powl.c'] # individual math files
     )