add process_vm_readv and process_vm_writev syscall wrappers

based on a patch submitted by Kristian L. <email@thexception.net>

include/sys/uio.h

@@ -9,11 +9,20 @@ extern "C" {
 #define __NEED_ssize_t
 #define __NEED_struct_iovec
 
+#ifdef _GNU_SOURCE
+#define __NEED_pid_t
+#endif
+
 #include <bits/alltypes.h>
 
 ssize_t readv (int, const struct iovec *, int);
 ssize_t writev (int, const struct iovec *, int);
 
+#ifdef _GNU_SOURCE
+ssize_t process_vm_writev(pid_t, const struct iovec *, unsigned long, const struct iovec *, unsigned long, unsigned long);
+ssize_t process_vm_readv(pid_t, const struct iovec *, unsigned long, const struct iovec *, unsigned long, unsigned long);
+#endif
+
 #ifdef __cplusplus
 }
 #endif

src/linux/process_vm.c

+#define _GNU_SOURCE
+#include <sys/uio.h>
+#include "syscall.h"
+
+ssize_t process_vm_writev(pid_t pid, const struct iovec *lvec, unsigned long liovcnt, const struct iovec *rvec, unsigned long riovcnt, unsigned long flags)
+{
+	return syscall(SYS_process_vm_writev, pid, lvec, liovcnt, rvec, riovcnt, flags);
+}
+
+ssize_t process_vm_readv(pid_t pid, const struct iovec *lvec, unsigned long liovcnt, const struct iovec *rvec, unsigned long riovcnt, unsigned long flags)
+{
+	return syscall(SYS_process_vm_readv, pid, lvec, liovcnt, rvec, riovcnt, flags);
+}