Experimental version of waitpid()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3359 42af7a65-404d-4744-a932-0658087f49c3

include/nuttx/sched.h

@@ -1,7 +1,7 @@
 /********************************************************************************
  * nuttx/sched.h
  *
- *   Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -178,6 +178,10 @@ struct _TCB
   start_t  start;                        /* Thread start function               */
   entry_t  entry;                        /* Entry Point into the thread         */
   exitfunc_t exitfunc;                   /* Called if exit is called.           */
+#ifdef CONFIG_SCHED_WAITPID /* Experimental */
+  sem_t    exitsem;                      /* Support for waitpid                 */
+  int     *stat_loc;                     /* Location to return exit status      */
+#endif
   uint8_t  sched_priority;               /* Current priority of the thread      */
 #ifdef CONFIG_PRIORITY_INHERITANCE
 #  if CONFIG_SEM_NNESTPRIO > 0

include/sys/types.h

@@ -152,6 +152,12 @@ typedef uint16_t     ino_t;
 
 typedef int          pid_t;
 
+/* id_t is a general identifier that can be used to contain at least a pid_t,
+ * uid_t, or gid_t.
+ */
+
+typedef unsigned int id_t;
+
 /* blkcnt_t and off_t are signed integer types.
  *
  *   blkcnt_t is used for file block counts.

include/sys/wait.h

@@ -0,0 +1,118 @@
+/****************************************************************************
+ * include/sys/wait.h
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_SYS_WAIT_H
+#define __INCLUDE_SYS_WAIT_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <signal.h>
+
+#ifdef CONFIG_SCHED_WAITPID
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/* The following are provided for analysis of returned status values.
+ * Encoded is as follows as 2 bytes of info(MS) then two bytes of code (LS).
+ * Code:
+ *   0 - Child has exited, info is the exit code.
+ *   Other values - Not implemented
+ */
+
+#define WEXITSTATUS(s)  (((s) >> 8) & 0xff)/* Return exit status */
+
+#define WIFEXITED(s)    (((s) & 0xff) == 0) /* True: Child exited normally */
+#define WIFCONTINUED(s) (false)  /* True: Child has been continued */
+#define WIFSIGNALED(s)  (false)  /* True: Child exited due to uncaught signal */
+#define WIFSTOPPED(s)   (false)  /* True: Child is currently stopped */
+#define WSTOPSIG(s)     (false)  /* Return signal number that caused process to stop */
+#define WTERMSIG(s)     (false)  /* Return signal number that caused process to terminate */
+
+/* The following symbolic constants are possible values for the options
+ * argument to waitpi(1) (1) and/or waitid() (2),
+ */
+
+#define WCONTINUED      (1 << 0) /* Status for child that has been continued (1)(2) */
+#define WNOHANG         (1 << 1) /* Do not wait if status not available (1) */
+#define WUNTRACED       (1 << 2) /* Report status of stopped child process (1) */
+
+#define WEXITED         (1 << 3) /* Wait for processes that have exited (2) */
+#define WSTOPPED        (1 << 4) /* Status for child stopped on signal (2) */
+#define WNOHANG         (1 << 5) /* Return immediately if there are no children (2) */
+#define WNOWAIT         (1 << 6) /* Keep the process in a waitable state (2) */
+
+/****************************************************************************
+ * Public Type Definitions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+enum idtype_e
+{
+  P_PID = 1,
+  P_GID = 2,
+  P_ALL = 3
+};
+typedef enum idtype_e idtype_t;
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+EXTERN pid_t wait(int *stat_loc);
+EXTERN int   waitid(idtype_t idtype, id_t id, siginfo_t *siginfo, int options);
+EXTERN pid_t waitpid(pid_t pid, int *stat_loc, int options);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_SCHED_WAITPID */
+#endif /* __INCLUDE_SYS_WAIT_H */