summaryrefslogtreecommitdiffstats
path: root/arch/um/os-Linux/helper.c
diff options
context:
space:
mode:
authorJeff Dike <jdike@addtoit.com>2008-02-05 07:31:10 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 18:44:30 +0100
commit1aa351a308d2c3ddb92b6cc45083fc54271d0010 (patch)
tree8694809fe286285fa4afbacd5d69e9097d5baf62 /arch/um/os-Linux/helper.c
parentuml: use barrier() instead of mb() (diff)
downloadlinux-1aa351a308d2c3ddb92b6cc45083fc54271d0010.tar.xz
linux-1aa351a308d2c3ddb92b6cc45083fc54271d0010.zip
uml: tidy helper code
Style fixes to arch/um/os/helper.c and tidying up the breakpoint fix a bit. helper.c gets all the usual style fixes - updated copyright all printks get severities Also - errval changes to err in helper_child fixed an obsolete comment run_helper was killing a child process which is guaranteed to be dead or dying anyway Removed the nohang and pname arguments from helper_wait and fixed the declaration and callers. nohang was used only in the slirp driver and I don't think it was needed. I think pname was a bit of overkill in putting out an error message when something goes wrong. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/os-Linux/helper.c')
-rw-r--r--arch/um/os-Linux/helper.c74
1 files changed, 30 insertions, 44 deletions
diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
index fba3f0fefeef..f4bd349d4412 100644
--- a/arch/um/os-Linux/helper.c
+++ b/arch/um/os-Linux/helper.c
@@ -1,22 +1,19 @@
/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sched.h>
-#include <limits.h>
-#include <sys/signal.h>
-#include <sys/wait.h>
#include <sys/socket.h>
-#include "user.h"
+#include <sys/wait.h>
+#include "kern_constants.h"
#include "kern_util.h"
#include "os.h"
#include "um_malloc.h"
-#include "kern_constants.h"
+#include "user.h"
struct helper_data {
void (*pre_exec)(void*);
@@ -30,21 +27,19 @@ static int helper_child(void *arg)
{
struct helper_data *data = arg;
char **argv = data->argv;
- int errval;
+ int err;
if (data->pre_exec != NULL)
(*data->pre_exec)(data->pre_data);
- errval = execvp_noalloc(data->buf, argv[0], argv);
- printk("helper_child - execvp of '%s' failed - errno = %d\n", argv[0],
- -errval);
- write(data->fd, &errval, sizeof(errval));
- kill(os_getpid(), SIGKILL);
+ err = execvp_noalloc(data->buf, argv[0], argv);
+
+ /* If the exec succeeds, we don't get here */
+ write(data->fd, &err, sizeof(err));
+
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, so
- * we need to receive a preallocated stack (a local buffer is ok). */
+/* Returns either the pid of the child process we run or -E* on failure. */
int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv)
{
struct helper_data data;
@@ -58,14 +53,15 @@ int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv)
ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
if (ret < 0) {
ret = -errno;
- printk("run_helper : pipe failed, errno = %d\n", errno);
+ printk(UM_KERN_ERR "run_helper : pipe failed, errno = %d\n",
+ errno);
goto out_free;
}
ret = os_set_exec_close(fds[1]);
if (ret < 0) {
- printk("run_helper : setting FD_CLOEXEC failed, ret = %d\n",
- -ret);
+ printk(UM_KERN_ERR "run_helper : setting FD_CLOEXEC failed, "
+ "ret = %d\n", -ret);
goto out_close;
}
@@ -79,7 +75,8 @@ int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv)
pid = clone(helper_child, (void *) sp, CLONE_VM, &data);
if (pid < 0) {
ret = -errno;
- printk("run_helper : clone failed, errno = %d\n", errno);
+ printk(UM_KERN_ERR "run_helper : clone failed, errno = %d\n",
+ errno);
goto out_free2;
}
@@ -96,10 +93,9 @@ int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv)
} else {
if (n < 0) {
n = -errno;
- printk("run_helper : read on pipe failed, ret = %d\n",
- -n);
+ printk(UM_KERN_ERR "run_helper : read on pipe failed, "
+ "ret = %d\n", -n);
ret = n;
- kill(pid, SIGKILL);
}
CATCH_EINTR(waitpid(pid, NULL, __WCLONE));
}
@@ -129,50 +125,40 @@ int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
pid = clone(proc, (void *) sp, flags, arg);
if (pid < 0) {
err = -errno;
- printk("run_helper_thread : clone failed, errno = %d\n",
- errno);
+ printk(UM_KERN_ERR "run_helper_thread : clone failed, "
+ "errno = %d\n", errno);
return err;
}
if (stack_out == NULL) {
CATCH_EINTR(pid = waitpid(pid, &status, __WCLONE));
if (pid < 0) {
err = -errno;
- printk("run_helper_thread - wait failed, errno = %d\n",
- errno);
+ printk(UM_KERN_ERR "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);
+ printk(UM_KERN_ERR "run_helper_thread - thread "
+ "returned status 0x%x\n", status);
free_stack(stack, 0);
} else
*stack_out = stack;
return pid;
}
-int helper_wait(int pid, int nohang, char *pname)
+int helper_wait(int pid)
{
int ret, status;
int wflags = __WCLONE;
- if (nohang)
- wflags |= WNOHANG;
-
- if (!pname)
- pname = "helper_wait";
-
CATCH_EINTR(ret = waitpid(pid, &status, wflags));
if (ret < 0) {
- printk(UM_KERN_ERR "%s : waitpid process %d failed, "
- "errno = %d\n", pname, pid, errno);
+ printk(UM_KERN_ERR "helper_wait : waitpid process %d failed, "
+ "errno = %d\n", pid, errno);
return -errno;
- } else if (nohang && ret == 0) {
- printk(UM_KERN_ERR "%s : process %d has not exited\n",
- pname, pid);
- return -ECHILD;
} else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
- printk(UM_KERN_ERR "%s : process %d didn't exit with "
- "status 0\n", pname, pid);
+ printk(UM_KERN_ERR "helper_wait : process %d exited with "
+ "status 0x%x\n", pid, status);
return -ECHILD;
} else
return 0;