Add compatibility layer for older Linux systems

Author: jrialland

c-sources/compat.c

@@ -0,0 +1,35 @@
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+#ifdef __linux__
+#ifndef SYS_copy_file_range
+// Fallback implementation using read/write
+ssize_t copy_file_range(int fd_in, loff_t *off_in, int fd_out,
+                       loff_t *off_out, size_t len, unsigned int flags)
+{
+    char buf[8192];
+    ssize_t bytes_read, bytes_written;
+    size_t total = 0;
+    
+    while (total < len) {
+        size_t to_read = len - total;
+        if (to_read > sizeof(buf))
+            to_read = sizeof(buf);
+            
+        bytes_read = read(fd_in, buf, to_read);
+        if (bytes_read <= 0)
+            return total > 0 ? total : bytes_read;
+            
+        bytes_written = write(fd_out, buf, bytes_read);
+        if (bytes_written != bytes_read)
+            return -1;
+            
+        total += bytes_written;
+    }
+    
+    return total;
+}
+#endif
+#endif

configure.py

@@ -29,6 +29,10 @@ def configure(config: ZigCcConfig):
 
     # Use wrapper for quickjs.c to ensure stddef.h is included
     config["sources"].append("c-sources/quickjs_wrapper.c")
+
+    # Add compatibility layer for older Linux systems
+    if os.name == "posix" and os.uname().sysname == "Linux":
+        config["sources"].append("c-sources/compat.c")
 
     for src in qjs_sources:
         config["sources"].append(os.path.join(qjs_root, src))
@@ -45,3 +49,4 @@ def configure(config: ZigCcConfig):
     config["defines"].append("_GNU_SOURCE")
     config["defines"].append('CONFIG_VERSION="2025-09-13"')
     config["defines"].append("CONFIG_BIGNUM")
+