Initial commit

Author: sere

README.md

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+Source code for the webvm.io webpage.
+
+Please use github.com/webvm/issues to signal any bug.
+
+
+This project depends on xterm.js (https://xtermjs.org/) and on its add-on xterm-addon-fit
+
+To update the xterm-related files do:
+```
+mkdir build
+cd build
+npm install --save xterm
+npm install --save xterm-addon-fit
+cd ../xterm
+cp ../build/node_modules/xterm/lib/xterm.js .
+cp ../build/node_modules/xterm/css/xterm.css .
+cp ../build/node_modules/xterm-addon-fit/lib/xterm-addon-fit.js .
+cd ..
+rm -r build
+```

assets/webvm.jpeg

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+SRCS = $(wildcard *.c)
+
+PROGS = $(patsubst %.c,%,$(SRCS))
+
+all: $(PROGS)
+
+%: %.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+clean: 
+	rm -f $(PROGS)
+
+.PHONY: all clean

examples/c/Makefile

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+#include <stdio.h>
+  
+// Most of the C compilers support a third parameter to main which
+// store all envorinment variables
+int main(int argc, char *argv[], char * envp[])
+{
+    int i;
+    for (i = 0; envp[i] != NULL; i++)
+        printf("\n%s", envp[i]);
+    getchar();
+    return 0;
+}

examples/c/env.c

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+#include <stdio.h>
+
+int main()
+{
+	printf("Hello, World!\n");
+}

examples/c/helloworld.c

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+#include <unistd.h>
+
+int main()
+{
+	link("env", "env3");
+	return 0;
+}

examples/c/link.c

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+#include <fcntl.h>
+#include <stdio.h>
+#include <errno.h>
+
+int main()
+{
+	int ret = openat(AT_FDCWD, "/dev/tty", 0x88102, 0);
+	printf("return value is %d and errno is %d\n", ret, errno);
+}
+

examples/c/openat.c

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+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+
+int main()
+{
+	int status;
+
+	pid_t p = getpid();
+	// waitpid takes a children's pid, not the current process one
+	// if the pid is not a children of the current process, it returns -ECHILD
+	pid_t res = waitpid(1001, &status, WNOHANG);
+
+	printf("res is %d, p is %d and errno is %d\n", res, p, errno);
+
+}

examples/c/waitpid.c

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+#!/usr/bin/env luajit
+cfizz,cbuzz=0,0
+for i=1,20 do
+	cfizz=cfizz+1
+	cbuzz=cbuzz+1
+	io.write(i .. ": ")
+	if cfizz~=3 and cbuzz~=5 then
+		io.write(i)
+	else
+		if cfizz==3 then
+			io.write("Fizz")
+			cfizz=0
+		end
+		if cbuzz==5 then
+			io.write("Buzz")
+			cbuzz=0
+		end
+	end
+	io.write("\n")
+end

examples/lua/fizzbuzz.lua

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+fruits = {"banana","orange","apple","grapes"}
+
+for k,v in ipairs(fruits) do
+   print(k,v)
+end
+
+table.sort(fruits)
+print("sorted table")
+
+for k,v in ipairs(fruits) do
+   print(k,v)
+end