1 files changed, 57 insertions, 0 deletions
diff --git a/src/pdclib/platform/example/functions/stdlib/system.c b/src/pdclib/platform/example/functions/stdlib/system.c
new file mode 100644
index 0000000..15603c3
--- /dev/null
+++ b/src/pdclib/platform/example/functions/stdlib/system.c
@@ -0,0 +1,57 @@
+/* system( const char * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdlib.h>
+
+/* This is an example implementation of system() fit for use with POSIX kernels.
+*/
+
+extern int fork( void );
+extern int execve( const char * filename, char * const argv[], char * const envp[] );
+extern int wait( int * status );
+
+int system( const char * string )
+{
+    const char * argv[] = { "sh", "-c", NULL, NULL };
+    argv[2] = string;
+    if ( string != NULL )
+    {
+        int pid = fork();
+        if ( pid == 0 )
+        {
+            execve( "/bin/sh", (char * * const)argv, NULL );
+        }
+        else if ( pid > 0 )
+        {
+            while( wait( NULL ) != pid );
+        }
+    }
+    return -1;
+}
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+#define SHELLCOMMAND "echo 'SUCCESS testing system()'"
+
+int main( void )
+{
+    FILE * fh;
+    char buffer[25];
+    buffer[24] = 'x';
+    TESTCASE( ( fh = freopen( testfile, "wb+", stdout ) ) != NULL );
+    TESTCASE( system( SHELLCOMMAND ) );
+    rewind( fh );
+    TESTCASE( fread( buffer, 1, 24, fh ) == 24 );
+    TESTCASE( memcmp( buffer, "SUCCESS testing system()", 24 ) == 0 );
+    TESTCASE( buffer[24] == 'x' );
+    TESTCASE( fclose( fh ) == 0 );
+    TESTCASE( remove( testfile ) == 0 );
+    return TEST_RESULTS;
+}
+
+#endif