Use struct info for signal numbers. NFC (#22461)

Author: sbc100

src/library.js

@@ -364,15 +364,14 @@ addToLibrary({
         var signalToNumber = (sig) => {
           // implement only the most common ones, and fallback to SIGINT
           switch (sig) {
-            case 'SIGHUP': return 1;
-            case 'SIGINT': return 2;
-            case 'SIGQUIT': return 3;
-            case 'SIGFPE': return 8;
-            case 'SIGKILL': return 9;
-            case 'SIGALRM': return 14;
-            case 'SIGTERM': return 15;
+            case 'SIGHUP': return {{{ cDefs.SIGHUP }}};
+            case 'SIGQUIT': return {{{ cDefs.SIGQUIT }}};
+            case 'SIGFPE': return {{{ cDefs.SIGFPE }}};
+            case 'SIGKILL': return {{{ cDefs.SIGKILL }}};
+            case 'SIGALRM': return {{{ cDefs.SIGALRM }}};
+            case 'SIGTERM': return {{{ cDefs.SIGTERM }}};
+            default: return {{{ cDefs.SIGINT }}};
           }
-          return 2; // SIGINT
         }
         return _W_EXITCODE(0, signalToNumber(ret.signal));
       }

src/struct_info.json

@@ -278,7 +278,13 @@
     {
         "file": "signal.h",
         "defines": [
-            "SIGALRM"
+            "SIGALRM",
+            "SIGFPE",
+            "SIGHUP",
+            "SIGINT",
+            "SIGKILL",
+            "SIGQUIT",
+            "SIGTERM"
         ]
     },
     {

src/struct_info_generated.json

@@ -371,6 +371,12 @@
         "SEEK_SET": 0,
         "SIGALRM": 14,
         "SIGCANCEL": 33,
+        "SIGFPE": 8,
+        "SIGHUP": 1,
+        "SIGINT": 2,
+        "SIGKILL": 9,
+        "SIGQUIT": 3,
+        "SIGTERM": 15,
         "SOCK_CLOEXEC": 524288,
         "SOCK_DGRAM": 2,
         "SOCK_NONBLOCK": 2048,

src/struct_info_generated_wasm64.json

@@ -371,6 +371,12 @@
         "SEEK_SET": 0,
         "SIGALRM": 14,
         "SIGCANCEL": 33,
+        "SIGFPE": 8,
+        "SIGHUP": 1,
+        "SIGINT": 2,
+        "SIGKILL": 9,
+        "SIGQUIT": 3,
+        "SIGTERM": 15,
         "SOCK_CLOEXEC": 524288,
         "SOCK_DGRAM": 2,
         "SOCK_NONBLOCK": 2048,