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Subject[PATCH 6/10] UML - Separate libc-dependent helper code
Date
From
The serial UML OS-abstraction layer patch (um/kernel dir).

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

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>

Index: linux-2.6.14/arch/um/drivers/chan_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/chan_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/chan_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -16,7 +16,6 @@
#include "user_util.h"
#include "chan_user.h"
#include "user.h"
-#include "helper.h"
#include "os.h"
#include "choose-mode.h"
#include "mode.h"
Index: linux-2.6.14/arch/um/drivers/harddog_kern.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/harddog_kern.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/harddog_kern.c 2005-10-30 19:27:49.000000000 -0500
@@ -46,7 +46,6 @@
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <asm/uaccess.h>
-#include "helper.h"
#include "mconsole.h"

MODULE_LICENSE("GPL");
Index: linux-2.6.14/arch/um/drivers/harddog_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/harddog_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/harddog_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -8,7 +8,6 @@
#include <errno.h>
#include "user_util.h"
#include "user.h"
-#include "helper.h"
#include "mconsole.h"
#include "os.h"
#include "choose-mode.h"
Index: linux-2.6.14/arch/um/drivers/net_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/net_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/net_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -16,7 +16,6 @@
#include "user_util.h"
#include "kern_util.h"
#include "net_user.h"
-#include "helper.h"
#include "os.h"

int tap_open_common(void *dev, char *gate_addr)
Index: linux-2.6.14/arch/um/drivers/port_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/port_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/port_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -18,7 +18,6 @@
#include "user.h"
#include "chan_user.h"
#include "port.h"
-#include "helper.h"
#include "os.h"

struct port_chan {
Index: linux-2.6.14/arch/um/drivers/slip_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/slip_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/slip_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -14,7 +14,6 @@
#include "net_user.h"
#include "slip.h"
#include "slip_common.h"
-#include "helper.h"
#include "os.h"

void slip_user_init(void *data, void *dev)
Index: linux-2.6.14/arch/um/drivers/slirp_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/slirp_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/slirp_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -13,7 +13,6 @@
#include "net_user.h"
#include "slirp.h"
#include "slip_common.h"
-#include "helper.h"
#include "os.h"

void slirp_user_init(void *data, void *dev)
Index: linux-2.6.14/arch/um/drivers/xterm.c
===================================================================
--- linux-2.6.14.orig/arch/um/drivers/xterm.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/drivers/xterm.c 2005-10-30 19:27:49.000000000 -0500
@@ -14,7 +14,6 @@
#include <sys/socket.h>
#include "kern_util.h"
#include "chan_user.h"
-#include "helper.h"
#include "user_util.h"
#include "user.h"
#include "os.h"
Index: linux-2.6.14/arch/um/include/helper.h
===================================================================
--- linux-2.6.14.orig/arch/um/include/helper.h 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/include/helper.h 2005-10-28 06:47:18.772411750 -0400
@@ -1,27 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#ifndef __HELPER_H__
-#define __HELPER_H__
-
-extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
- unsigned long *stack_out);
-extern int run_helper_thread(int (*proc)(void *), void *arg,
- unsigned int flags, unsigned long *stack_out,
- int stack_order);
-extern int helper_wait(int pid);
-
-#endif
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
Index: linux-2.6.14/arch/um/include/os.h
===================================================================
--- linux-2.6.14.orig/arch/um/include/os.h 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/include/os.h 2005-10-30 19:27:49.000000000 -0500
@@ -205,6 +205,14 @@ extern unsigned long __do_user_copy(void
void (*op)(void *to, const void *from,
int n), int *faulted_out);

+/* helper.c */
+extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
+ unsigned long *stack_out);
+extern int run_helper_thread(int (*proc)(void *), void *arg,
+ unsigned int flags, unsigned long *stack_out,
+ int stack_order);
+extern int helper_wait(int pid);
+
#endif

/*
Index: linux-2.6.14/arch/um/kernel/Makefile
===================================================================
--- linux-2.6.14.orig/arch/um/kernel/Makefile 2005-10-30 19:27:34.000000000 -0500
+++ linux-2.6.14/arch/um/kernel/Makefile 2005-10-30 19:28:09.000000000 -0500
@@ -7,7 +7,7 @@ extra-y := vmlinux.lds
clean-files :=

obj-y = config.o exec_kern.o exitcode.o \
- helper.o init_task.o irq.o irq_user.o ksyms.o mem.o physmem.o \
+ init_task.o irq.o irq_user.o ksyms.o mem.o physmem.o \
process_kern.o ptrace.o reboot.o resource.o sigio_user.o sigio_kern.o \
signal_kern.o signal_user.o smp.o syscall_kern.o sysrq.o time.o \
time_kern.o tlb.o trap_kern.o trap_user.o uaccess.o um_arch.o \
@@ -24,8 +24,7 @@ obj-$(CONFIG_MODE_SKAS) += skas/

user-objs-$(CONFIG_TTY_LOG) += tty_log.o

-USER_OBJS := $(user-objs-y) config.o helper.o time.o tty_log.o umid.o \
- user_util.o
+USER_OBJS := $(user-objs-y) config.o time.o tty_log.o umid.o user_util.o

include arch/um/scripts/Makefile.rules

Index: linux-2.6.14/arch/um/kernel/helper.c
===================================================================
--- linux-2.6.14.orig/arch/um/kernel/helper.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/kernel/helper.c 2005-10-28 06:47:18.772411750 -0400
@@ -1,165 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <sched.h>
-#include <sys/signal.h>
-#include <sys/wait.h>
-#include "user.h"
-#include "kern_util.h"
-#include "user_util.h"
-#include "helper.h"
-#include "os.h"
-
-struct helper_data {
- void (*pre_exec)(void*);
- void *pre_data;
- char **argv;
- int fd;
-};
-
-/* Debugging aid, changed only from gdb */
-int helper_pause = 0;
-
-static void helper_hup(int sig)
-{
-}
-
-static int helper_child(void *arg)
-{
- struct helper_data *data = arg;
- char **argv = data->argv;
- int errval;
-
- if(helper_pause){
- signal(SIGHUP, helper_hup);
- pause();
- }
- if(data->pre_exec != NULL)
- (*data->pre_exec)(data->pre_data);
- execvp(argv[0], argv);
- errval = errno;
- printk("execvp of '%s' failed - errno = %d\n", argv[0], errno);
- os_write_file(data->fd, &errval, sizeof(errval));
- os_kill_process(os_getpid(), 0);
- return(0);
-}
-
-/* Returns either the pid of the child process we run or -E* on failure.
- * XXX The alloc_stack here breaks if this is called in the tracing thread */
-int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
- unsigned long *stack_out)
-{
- struct helper_data data;
- unsigned long stack, sp;
- int pid, fds[2], ret, n;
-
- if((stack_out != NULL) && (*stack_out != 0))
- stack = *stack_out;
- else stack = alloc_stack(0, um_in_interrupt());
- if(stack == 0)
- return(-ENOMEM);
-
- ret = os_pipe(fds, 1, 0);
- if(ret < 0){
- printk("run_helper : pipe failed, ret = %d\n", -ret);
- goto out_free;
- }
-
- ret = os_set_exec_close(fds[1], 1);
- if(ret < 0){
- printk("run_helper : setting FD_CLOEXEC failed, ret = %d\n",
- -ret);
- goto out_close;
- }
-
- sp = stack + page_size() - sizeof(void *);
- data.pre_exec = pre_exec;
- data.pre_data = pre_data;
- data.argv = argv;
- data.fd = fds[1];
- pid = clone(helper_child, (void *) sp, CLONE_VM | SIGCHLD, &data);
- if(pid < 0){
- ret = -errno;
- printk("run_helper : clone failed, errno = %d\n", errno);
- goto out_close;
- }
-
- os_close_file(fds[1]);
- fds[1] = -1;
-
- /*Read the errno value from the child.*/
- n = os_read_file(fds[0], &ret, sizeof(ret));
- if(n < 0){
- printk("run_helper : read on pipe failed, ret = %d\n", -n);
- ret = n;
- os_kill_process(pid, 1);
- }
- else if(n != 0){
- CATCH_EINTR(n = waitpid(pid, NULL, 0));
- ret = -errno;
- } else {
- ret = pid;
- }
-
-out_close:
- if (fds[1] != -1)
- os_close_file(fds[1]);
- os_close_file(fds[0]);
-out_free:
- if(stack_out == NULL)
- free_stack(stack, 0);
- else *stack_out = stack;
- return(ret);
-}
-
-int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
- unsigned long *stack_out, int stack_order)
-{
- unsigned long stack, sp;
- int pid, status, err;
-
- stack = alloc_stack(stack_order, um_in_interrupt());
- if(stack == 0) return(-ENOMEM);
-
- sp = stack + (page_size() << stack_order) - sizeof(void *);
- pid = clone(proc, (void *) sp, flags | SIGCHLD, arg);
- if(pid < 0){
- err = -errno;
- printk("run_helper_thread : clone failed, errno = %d\n",
- errno);
- return err;
- }
- if(stack_out == NULL){
- CATCH_EINTR(pid = waitpid(pid, &status, 0));
- if(pid < 0){
- err = -errno;
- printk("run_helper_thread - wait failed, errno = %d\n",
- errno);
- pid = err;
- }
- if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
- printk("run_helper_thread - thread returned status "
- "0x%x\n", status);
- free_stack(stack, stack_order);
- }
- else *stack_out = stack;
- return(pid);
-}
-
-int helper_wait(int pid)
-{
- int ret;
-
- CATCH_EINTR(ret = waitpid(pid, NULL, WNOHANG));
- if(ret < 0){
- ret = -errno;
- printk("helper_wait : waitpid failed, errno = %d\n", errno);
- }
- return(ret);
-}
Index: linux-2.6.14/arch/um/kernel/ksyms.c
===================================================================
--- linux-2.6.14.orig/arch/um/kernel/ksyms.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/kernel/ksyms.c 2005-10-30 19:27:49.000000000 -0500
@@ -20,7 +20,6 @@
#include "user_util.h"
#include "mem_user.h"
#include "os.h"
-#include "helper.h"

EXPORT_SYMBOL(stop);
EXPORT_SYMBOL(uml_physmem);
Index: linux-2.6.14/arch/um/kernel/sigio_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/kernel/sigio_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/kernel/sigio_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -18,7 +18,6 @@
#include "kern_util.h"
#include "user_util.h"
#include "sigio.h"
-#include "helper.h"
#include "os.h"

/* Changed during early boot */
Index: linux-2.6.14/arch/um/kernel/user_util.c
===================================================================
--- linux-2.6.14.orig/arch/um/kernel/user_util.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/kernel/user_util.c 2005-10-30 19:27:49.000000000 -0500
@@ -27,7 +27,6 @@
#include "user.h"
#include "mem_user.h"
#include "init.h"
-#include "helper.h"
#include "ptrace_user.h"
#include "uml-config.h"

Index: linux-2.6.14/arch/um/os-Linux/Makefile
===================================================================
--- linux-2.6.14.orig/arch/um/os-Linux/Makefile 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/os-Linux/Makefile 2005-10-30 19:27:49.000000000 -0500
@@ -3,10 +3,11 @@
# Licensed under the GPL
#

-obj-y = aio.o elf_aux.o file.o main.o mem.o process.o signal.o start_up.o \
- time.o tt.o tty.o uaccess.o user_syms.o drivers/ sys-$(SUBARCH)/
+obj-y = aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
+ start_up.o time.o tt.o tty.o uaccess.o user_syms.o drivers/ \
+ sys-$(SUBARCH)/

-USER_OBJS := aio.o elf_aux.o file.o main.o mem.o process.o signal.o \
+USER_OBJS := aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
start_up.o time.o tt.o tty.o uaccess.o

elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
Index: linux-2.6.14/arch/um/os-Linux/aio.c
===================================================================
--- linux-2.6.14.orig/arch/um/os-Linux/aio.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/os-Linux/aio.c 2005-10-30 19:27:49.000000000 -0500
@@ -10,7 +10,6 @@
#include <sched.h>
#include <sys/syscall.h>
#include "os.h"
-#include "helper.h"
#include "aio.h"
#include "init.h"
#include "user.h"
Index: linux-2.6.14/arch/um/os-Linux/drivers/ethertap_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/os-Linux/drivers/ethertap_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/os-Linux/drivers/ethertap_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -19,7 +19,6 @@
#include "user_util.h"
#include "net_user.h"
#include "etap.h"
-#include "helper.h"
#include "os.h"

#define MAX_PACKET ETH_MAX_PACKET
Index: linux-2.6.14/arch/um/os-Linux/drivers/tuntap_user.c
===================================================================
--- linux-2.6.14.orig/arch/um/os-Linux/drivers/tuntap_user.c 2005-10-30 19:22:17.000000000 -0500
+++ linux-2.6.14/arch/um/os-Linux/drivers/tuntap_user.c 2005-10-30 19:27:49.000000000 -0500
@@ -20,7 +20,6 @@
#include "kern_util.h"
#include "user_util.h"
#include "user.h"
-#include "helper.h"
#include "os.h"

#define MAX_PACKET ETH_MAX_PACKET
Index: linux-2.6.14/arch/um/os-Linux/helper.c
===================================================================
--- linux-2.6.14.orig/arch/um/os-Linux/helper.c 2005-10-28 06:47:18.772411750 -0400
+++ linux-2.6.14/arch/um/os-Linux/helper.c 2005-10-30 19:27:49.000000000 -0500
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <sys/signal.h>
+#include <sys/wait.h>
+#include "user.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "os.h"
+
+struct helper_data {
+ void (*pre_exec)(void*);
+ void *pre_data;
+ char **argv;
+ int fd;
+};
+
+/* Debugging aid, changed only from gdb */
+int helper_pause = 0;
+
+static void helper_hup(int sig)
+{
+}
+
+static int helper_child(void *arg)
+{
+ struct helper_data *data = arg;
+ char **argv = data->argv;
+ int errval;
+
+ if(helper_pause){
+ signal(SIGHUP, helper_hup);
+ pause();
+ }
+ if(data->pre_exec != NULL)
+ (*data->pre_exec)(data->pre_data);
+ execvp(argv[0], argv);
+ errval = errno;
+ printk("execvp of '%s' failed - errno = %d\n", argv[0], errno);
+ os_write_file(data->fd, &errval, sizeof(errval));
+ kill(os_getpid(), SIGKILL);
+ return(0);
+}
+
+/* Returns either the pid of the child process we run or -E* on failure.
+ * XXX The alloc_stack here breaks if this is called in the tracing thread */
+int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
+ unsigned long *stack_out)
+{
+ struct helper_data data;
+ unsigned long stack, sp;
+ int pid, fds[2], ret, n;
+
+ if((stack_out != NULL) && (*stack_out != 0))
+ stack = *stack_out;
+ else stack = alloc_stack(0, um_in_interrupt());
+ if(stack == 0)
+ return(-ENOMEM);
+
+ ret = os_pipe(fds, 1, 0);
+ if(ret < 0){
+ printk("run_helper : pipe failed, ret = %d\n", -ret);
+ goto out_free;
+ }
+
+ ret = os_set_exec_close(fds[1], 1);
+ if(ret < 0){
+ printk("run_helper : setting FD_CLOEXEC failed, ret = %d\n",
+ -ret);
+ goto out_close;
+ }
+
+ sp = stack + page_size() - sizeof(void *);
+ data.pre_exec = pre_exec;
+ data.pre_data = pre_data;
+ data.argv = argv;
+ data.fd = fds[1];
+ pid = clone(helper_child, (void *) sp, CLONE_VM | SIGCHLD, &data);
+ if(pid < 0){
+ ret = -errno;
+ printk("run_helper : clone failed, errno = %d\n", errno);
+ goto out_close;
+ }
+
+ close(fds[1]);
+ fds[1] = -1;
+
+ /*Read the errno value from the child.*/
+ n = os_read_file(fds[0], &ret, sizeof(ret));
+ if(n < 0){
+ printk("run_helper : read on pipe failed, ret = %d\n", -n);
+ ret = n;
+ kill(pid, SIGKILL);
+ CATCH_EINTR(waitpid(pid, NULL, 0));
+ }
+ else if(n != 0){
+ CATCH_EINTR(n = waitpid(pid, NULL, 0));
+ ret = -errno;
+ } else {
+ ret = pid;
+ }
+
+out_close:
+ if (fds[1] != -1)
+ close(fds[1]);
+ close(fds[0]);
+out_free:
+ if(stack_out == NULL)
+ free_stack(stack, 0);
+ else *stack_out = stack;
+ return(ret);
+}
+
+int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
+ unsigned long *stack_out, int stack_order)
+{
+ unsigned long stack, sp;
+ int pid, status, err;
+
+ stack = alloc_stack(stack_order, um_in_interrupt());
+ if(stack == 0) return(-ENOMEM);
+
+ sp = stack + (page_size() << stack_order) - sizeof(void *);
+ pid = clone(proc, (void *) sp, flags | SIGCHLD, arg);
+ if(pid < 0){
+ err = -errno;
+ printk("run_helper_thread : clone failed, errno = %d\n",
+ errno);
+ return err;
+ }
+ if(stack_out == NULL){
+ CATCH_EINTR(pid = waitpid(pid, &status, 0));
+ if(pid < 0){
+ err = -errno;
+ printk("run_helper_thread - wait failed, errno = %d\n",
+ errno);
+ pid = err;
+ }
+ if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
+ printk("run_helper_thread - thread returned status "
+ "0x%x\n", status);
+ free_stack(stack, stack_order);
+ }
+ else *stack_out = stack;
+ return(pid);
+}
+
+int helper_wait(int pid)
+{
+ int ret;
+
+ CATCH_EINTR(ret = waitpid(pid, NULL, WNOHANG));
+ if(ret < 0){
+ ret = -errno;
+ printk("helper_wait : waitpid failed, errno = %d\n", errno);
+ }
+ return(ret);
+}
-
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