rune/libenclave/skeleton: sink the implementation of PAL V2 APIs.

Move the implementation of skeleton PAL V2 APIs from liberpal-skeleton-v2.c
to liberpal-skeleton.c
Signed-off-by: NYilin Li <YiLin.Li@linux.alibaba.com>

rune/libenclave/internal/runtime/pal/skeleton/liberpal-skeleton-v2.c

@@ -23,45 +23,17 @@ int pal_init(pal_attr_t *attr)
 
 int pal_create_process(pal_create_process_args *args)
 {
-	if (args == NULL || args->path == NULL || args->argv == NULL || args->pid == NULL || args->stdio == NULL) {
-		errno = EINVAL;
-		return -1;
-	}
-
-	int pid;
-	if ((pid = fork()) < 0)
-		return -1;
-	else if (pid == 0) {
-		int exit_code, ret;
-
-		ret = __pal_exec(args->path, args->argv, args->stdio, &exit_code);
-		exit(ret ? ret : exit_code);
-	} else
-		*args->pid = pid;
-
-	return 0;
+	return __pal_create_process(args);
 }
 
 int pal_exec(pal_exec_args *attr)
 {
-	if (attr == NULL || attr->exit_value == NULL) {
-		errno = EINVAL;
-		return -1;
-	}
-
-	int status;
-	waitpid(attr->pid, &status, 0);
-
-	if (WIFEXITED(status) || WIFSIGNALED(status))
-		*attr->exit_value = WEXITSTATUS(status);
-
-	return 0;
+	return wait4child(attr);
 }
 
 int pal_kill(int pid, int sig)
 {
-	/* No implementation */
-	return 0;
+	return __pal_kill(pid, sig);
 }
 
 int pal_destroy(void)

rune/libenclave/internal/runtime/pal/skeleton/liberpal-skeleton.c

@@ -13,6 +13,7 @@
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/time.h>
+#include <sys/wait.h>
 #if __GLIBC__ == 2 && __GLIBC_MINOR__ < 25
 #include <sys/types.h>
 #else
@@ -467,6 +468,49 @@ int __pal_exec(char *path, char *argv[], pal_stdio_fds *stdio, int *exit_code)
 	return 0;
 }
 
+int __pal_create_process(pal_create_process_args *args)
+{
+	int pid;
+
+	if (args == NULL || args->path == NULL || args->argv == NULL || args->pid == NULL || args->stdio == NULL) {
+		return -1;
+	}
+
+	if ((pid = fork()) < 0)
+		return -1;
+	else if (pid == 0) {
+		int exit_code, ret;
+
+		ret = __pal_exec(args->path, args->argv, args->stdio, &exit_code);
+		exit(ret ? ret : exit_code);
+	} else
+		*args->pid = pid;
+
+	return 0;
+}
+
+int wait4child(pal_exec_args *attr)
+{
+	int status;
+
+	if (attr == NULL || attr->exit_value == NULL) {
+		return -1;
+	}
+
+	waitpid(attr->pid, &status, 0);
+
+	if (WIFEXITED(status) || WIFSIGNALED(status))
+		*attr->exit_value = WEXITSTATUS(status);
+
+	return 0;
+}
+
+int __pal_kill(int pid, int sig)
+{
+	/* No implementation */
+	return 0;
+}
+
 int __pal_destory(void)
 {
 	if (!initialized) {

rune/libenclave/internal/runtime/pal/skeleton/liberpal-skeleton.h

@@ -29,6 +29,9 @@ typedef struct {
 
 int __pal_init(pal_attr_t *attr);
 int __pal_exec(char *path, char *argv[], pal_stdio_fds *stdio, int *exit_code);
+int __pal_create_process(pal_create_process_args *args);
+int wait4child(pal_exec_args *attr);
+int __pal_kill(int pid, int sig);
 int __pal_destory(void);
 
 #endif