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libc/posix: Add system()

--- a/src/libc/arch/posix/Makefile

+++ b/src/libc/arch/posix/Makefile

@@ -13,6 +13,7 @@

 	getenv.$O\

 	raise.$O\

 	signal.$O\

+	system.$O\

 	time.$O\

 all: $(OBJS)

--- /dev/null

+++ b/src/libc/arch/posix/system.c

@@ -1,0 +1,34 @@

+#include <sys.h>

+

+#include <errno.h>

+#include <stdlib.h>

+

+#include "../../syscall.h"

+

+#define SHELL "/bin/sh"

+

+#undef system

+

+extern char **_environ;

+

+int

+system(const char *cmd)

+{

+	int st;

+	pid_t pid;

+

+	if (!cmd)

+		return _access(SHELL, X_OK);

+

+	switch ((pid = _fork())) {

+	case -1:

+		return -1;

+	case 0:

+		_execve(SHELL, (char*[]) {"sh", "-c", cmd, NULL}, _environ);

+		_exit(127);

+	default:

+		while (_waitpid(pid, &st, 0) < 0 && errno == EINTR)

+			;

+		return st;

+	}

+}

--- a/src/libc/objs/amd64-linux.mk

+++ b/src/libc/objs/amd64-linux.mk

@@ -44,5 +44,6 @@

 	arch/posix/getenv.$O\

 	arch/posix/raise.$O\

 	arch/posix/signal.$O\

+	arch/posix/system.$O\

 	arch/posix/time.$O\

 	string/strlen.$O\

--- a/src/libc/objs/amd64-netbsd.mk

+++ b/src/libc/objs/amd64-netbsd.mk

@@ -37,5 +37,6 @@

 	arch/posix/getenv.$O\

 	arch/posix/raise.$O\

 	arch/posix/signal.$O\

+	arch/posix/system.$O\

 	arch/posix/time.$O\

 	string/strlen.$O\

--- a/src/libc/objs/amd64-openbsd.mk

+++ b/src/libc/objs/amd64-openbsd.mk

@@ -36,5 +36,6 @@

 	arch/posix/getenv.$O\

 	arch/posix/raise.$O\

 	arch/posix/signal.$O\

+	arch/posix/system.$O\

 	arch/posix/time.$O\

 	string/strlen.$O\