[PATCH] uml: move libc-dependent utility procedures

The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from user_util.c file under os-Linux dir

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/os-Linux/Makefile

@@ -5,12 +5,12 @@
 
 obj-y = aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
 	start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o user_syms.o \
-	drivers/ sys-$(SUBARCH)/
+	util.o drivers/ sys-$(SUBARCH)/
 
 obj-$(CONFIG_MODE_SKAS) += skas/
 
 USER_OBJS := aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
-	start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o
+	start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o util.o
 
 elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
 CFLAGS_elf_aux.o += -I$(objtree)/arch/um

arch/um/os-Linux/tt.c

@@ -63,6 +63,54 @@ void kill_child_dead(int pid)
 	} while(1);
 }
 
+void stop(void)
+{
+	while(1) sleep(1000000);
+}
+
+int wait_for_stop(int pid, int sig, int cont_type, void *relay)
+{
+	sigset_t *relay_signals = relay;
+	int status, ret;
+
+	while(1){
+		CATCH_EINTR(ret = waitpid(pid, &status, WUNTRACED));
+		if((ret < 0) ||
+		   !WIFSTOPPED(status) || (WSTOPSIG(status) != sig)){
+			if(ret < 0){
+				printk("wait failed, errno = %d\n",
+				       errno);
+			}
+			else if(WIFEXITED(status))
+				printk("process %d exited with status %d\n",
+				       pid, WEXITSTATUS(status));
+			else if(WIFSIGNALED(status))
+				printk("process %d exited with signal %d\n",
+				       pid, WTERMSIG(status));
+			else if((WSTOPSIG(status) == SIGVTALRM) ||
+				(WSTOPSIG(status) == SIGALRM) ||
+				(WSTOPSIG(status) == SIGIO) ||
+				(WSTOPSIG(status) == SIGPROF) ||
+				(WSTOPSIG(status) == SIGCHLD) ||
+				(WSTOPSIG(status) == SIGWINCH) ||
+				(WSTOPSIG(status) == SIGINT)){
+				ptrace(cont_type, pid, 0, WSTOPSIG(status));
+				continue;
+			}
+			else if((relay_signals != NULL) &&
+				sigismember(relay_signals, WSTOPSIG(status))){
+				ptrace(cont_type, pid, 0, WSTOPSIG(status));
+				continue;
+			}
+			else printk("process %d stopped with signal %d\n",
+				    pid, WSTOPSIG(status));
+			panic("wait_for_stop failed to wait for %d to stop "
+			      "with %d\n", pid, sig);
+		}
+		return(status);
+	}
+}
+
 /*
  *-------------------------
  * only for tt mode (will be deleted in future...)

arch/um/os-Linux/util.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+#include <setjmp.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/utsname.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include "asm/types.h"
+#include <ctype.h>
+#include <signal.h>
+#include <wait.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <sched.h>
+#include <termios.h>
+#include <string.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "mem_user.h"
+#include "init.h"
+#include "ptrace_user.h"
+#include "uml-config.h"
+#include "os.h"
+
+void stack_protections(unsigned long address)
+{
+	int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
+
+	if(mprotect((void *) address, page_size(), prot) < 0)
+		panic("protecting stack failed, errno = %d", errno);
+}
+
+void task_protections(unsigned long address)
+{
+	unsigned long guard = address + page_size();
+	unsigned long stack = guard + page_size();
+	int prot = 0, pages;
+
+#ifdef notdef
+	if(mprotect((void *) stack, page_size(), prot) < 0)
+		panic("protecting guard page failed, errno = %d", errno);
+#endif
+	pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
+	prot = PROT_READ | PROT_WRITE | PROT_EXEC;
+	if(mprotect((void *) stack, pages * page_size(), prot) < 0)
+		panic("protecting stack failed, errno = %d", errno);
+}
+
+int raw(int fd)
+{
+	struct termios tt;
+	int err;
+
+	CATCH_EINTR(err = tcgetattr(fd, &tt));
+	if(err < 0)
+		return -errno;
+
+	cfmakeraw(&tt);
+
+	CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
+	if(err < 0)
+		return -errno;
+
+	/* XXX tcsetattr could have applied only some changes
+	 * (and cfmakeraw() is a set of changes) */
+	return(0);
+}
+
+void setup_machinename(char *machine_out)
+{
+	struct utsname host;
+
+	uname(&host);
+#if defined(UML_CONFIG_UML_X86) && !defined(UML_CONFIG_64BIT)
+	if (!strcmp(host.machine, "x86_64")) {
+		strcpy(machine_out, "i686");
+		return;
+	}
+#endif
+	strcpy(machine_out, host.machine);
+}
+
+char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
+
+void setup_hostinfo(void)
+{
+	struct utsname host;
+
+	uname(&host);
+	sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
+		host.release, host.version, host.machine);
+}
+
+int setjmp_wrapper(void (*proc)(void *, void *), ...)
+{
+	va_list args;
+	sigjmp_buf buf;
+	int n;
+
+	n = sigsetjmp(buf, 1);
+	if(n == 0){
+		va_start(args, proc);
+		(*proc)(&buf, &args);
+	}
+	va_end(args);
+	return(n);
+}