From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
Date: Sat, 30 Jan 2010 12:49:30 -0800
Subject: [PATCH 1/6] eclone-1: Test basic functionality
Verify that a child process gets the expected pid and arguments on stack
when it is created with eclone() system call.
Changelog[v2]:
- Use libeclone.a from user-cr git tree so tests are portable across
architectures.
- Fix a couple of nits identified by Serge Hallyn
Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
---
Makefile | 2 +-
eclone/Makefile | 21 +++++++++
eclone/eclone-1.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++
eclone/eclone-tests.h | 66 +++++++++++++++++++++++++++
4 files changed, 207 insertions(+), 1 deletions(-)
create mode 100644 eclone/Makefile
create mode 100644 eclone/eclone-1.c
create mode 100644 eclone/eclone-tests.h
diff --git a/Makefile b/Makefile
index 95f8b6e..1d412b9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
SUBDIRS = libcrtest counterloop fileio simple userns ipc sleep \
- process-tree futex epoll taskfs
+ process-tree futex epoll taskfs eclone
targets = ns_exec mysu
diff --git a/eclone/Makefile b/eclone/Makefile
new file mode 100644
index 0000000..10b63d3
--- /dev/null
+++ b/eclone/Makefile
@@ -0,0 +1,21 @@
+#
+# libeclone.a is built/installed from user-cr git-tree. Point USER_CR_DIR
+# to the directory containing libeclone.a and genstack.h
+#
+USER_CR_DIR ?= ../../user-cr
+
+CFLAGS = -Wall -I $(USER_CR_DIR)
+
+LDFLAGS =
+
+LIB_ECLONE = $(USER_CR_DIR)/libeclone.a
+
+PROGS = eclone-1
+
+all: $(PROGS)
+
+$(PROGS): %: %.c
+ $(CC) $(CFLAGS) -o $@ $< $(LIB_ECLONE) $(LDFLAGS)
+
+clean:
+ rm -f *.o $(PROGS)
diff --git a/eclone/eclone-1.c b/eclone/eclone-1.c
new file mode 100644
index 0000000..5aa69ed
--- /dev/null
+++ b/eclone/eclone-1.c
@@ -0,0 +1,119 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/syscall.h>
+#include "eclone-tests.h"
+#include "genstack.h"
+
+int verbose = 0;
+int child_tid, parent_tid;
+
+#define CHILD_TID1 377
+#define CHILD_ARG (void *)0x979797
+
+pid_t pids[] = { CHILD_TID1 };
+
+int do_child(void *arg)
+{
+ sleep(3);
+
+ if (arg != CHILD_ARG) {
+ printf("ERROR: Expected arg %p, actual %p\n", CHILD_ARG, arg);
+ exit(1);
+ }
+
+ if (gettid() != CHILD_TID1) {
+ printf("FAIL: Child expected pid %d, actual %d\n", CHILD_TID1,
+ getpid());
+ exit(2);
+ } else {
+ printf("PASS: Child got expected pid %d\n", CHILD_TID1);
+ exit(0);
+ }
+
+}
+
+static int do_eclone(int (*child_fn)(void *), void *child_arg,
+ unsigned int flags_low, int nr_pids, pid_t *pids)
+{
+ int rc;
+ struct clone_args clone_args;
+ genstack stack;
+
+ stack = genstack_alloc(STACKSIZE);
+ if (!stack) {
+ printf("ERROR: genstack_alloc() returns NULL for size %d\n",
+ STACKSIZE);
+ exit(1);
+ }
+
+ memset(&clone_args, 0, sizeof(clone_args));
+ clone_args.child_stack = (u64)(int)genstack_sp(stack);
+ clone_args.child_stack_size = (u64)0;
+ clone_args.parent_tid_ptr = (u64)((int)&parent_tid);
+ clone_args.child_tid_ptr = (u64)((int)&child_tid);
+ clone_args.nr_pids = nr_pids;
+
+ if (verbose) {
+ printf("[%d, %d]: Parent:\n\t child_stack 0x%p, ptidp %llx, "
+ "ctidp %llx, pids %p\n", getpid(), gettid(),
+ stack, clone_args.parent_tid_ptr,
+ clone_args.child_tid_ptr, pids);
+ }
+
+ rc = eclone(child_fn, child_arg, flags_low, &clone_args, pids);
+
+ if (verbose) {
+ printf("[%d, %d]: eclone() returned %d, error %d\n", getpid(),
+ gettid(), rc, errno);
+ fflush(stdout);
+ }
+
+ if (rc < 0) {
+ printf("ERROR: rc %d, errno %d\n", rc, errno);
+ exit(1);
+ }
+
+ return rc;
+}
+
+int main()
+{
+ int rc, pid, status;
+ unsigned long flags;
+ int nr_pids = 1;
+
+ flags = SIGCHLD|CLONE_PARENT_SETTID|CLONE_CHILD_SETTID;
+
+ pid = do_eclone(do_child, CHILD_ARG, flags, nr_pids, pids);
+
+ if (verbose) {
+ printf("[%d, %d]: Parent waiting for %d\n", getpid(),
+ gettid(), pid);
+ }
+
+ rc = waitpid(pid, &status, __WALL);
+ if (rc < 0) {
+ printf("ERROR: ");
+ verbose = 1;
+ }
+
+ if (verbose) {
+ printf("\twaitpid(): child %d, rc %d, error %d, status 0x%x\n",
+ getpid(), rc, errno, status);
+ if (rc >=0) {
+ if (WIFEXITED(status)) {
+ printf("\t EXITED, %d\n", WEXITSTATUS(status));
+ } else if (WIFSIGNALED(status)) {
+ printf("\t SIGNALED, %d\n", WTERMSIG(status));
+ }
+ }
+ }
+
+ return 0;
+}
diff --git a/eclone/eclone-tests.h b/eclone/eclone-tests.h
new file mode 100644
index 0000000..f869f99
--- /dev/null
+++ b/eclone/eclone-tests.h
@@ -0,0 +1,66 @@
+#include <errno.h>
+
+/*
+ * Some of these definitions need to eventually be defined in system files
+ * like <sys/types.h>, <sched.h> etc
+ */
+#ifndef CLONE_NEWPID
+#define CLONE_NEWPID 0x20000000
+#endif
+
+#ifndef CLONE_CHILD_SETTID
+#define CLONE_CHILD_SETTID 0x01000000
+#endif
+
+#ifndef CLONE_PARENT_SETTID
+#define CLONE_PARENT_SETTID 0x00100000
+#endif
+
+#ifndef CLONE_UNUSED
+#define CLONE_UNUSED 0x00001000
+#endif
+
+#define STACKSIZE 8192
+
+typedef unsigned long long u64;
+typedef unsigned int u32;
+typedef int pid_t;
+
+struct clone_args {
+ u64 clone_flags_high;
+ /*
+ * Architectures can use child_stack for either the stack pointer or
+ * the base of of stack. If child_stack is used as the stack pointer,
+ * child_stack_size must be 0. Otherwise child_stack_size must be
+ * set to size of allocated stack.
+ */
+ u64 child_stack;
+ u64 child_stack_size;
+ u64 parent_tid_ptr;
+ u64 child_tid_ptr;
+ u32 nr_pids;
+ u32 reserved0;
+};
+
+int eclone(int (*fn)(void *), void *fn_arg, int clone_flags_low,
+ struct clone_args *clone_args, pid_t *pids);
+
+#if __i386__
+# define __NR_gettid 224
+#elif __x86_64__
+# define __NR_gettid 186
+#elif __ia64__
+# define __NR_gettid 1105
+#elif __s390x__
+# define __NR_gettid 236
+#elif __powerpc__
+# define __NR_gettid 207
+#else
+# error "Architecture not supported for gettid()"
+#endif
+
+/* gettid() is sometimes more useful than getpid() when using clone() */
+static inline int gettid()
+{
+ return syscall(__NR_gettid, 0, 0, 0);
+}
--
1.6.6.1
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