From 4da3758acf0327d429dfce3d313b50c2e0fc7723 Mon Sep 17 00:00:00 2001
From: Chiichen <39649411+Chiichen@users.noreply.github.com>
Date: Wed, 2 Aug 2023 14:29:59 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E4=BA=86wait4=E7=9A=84?=
 =?UTF-8?q?=E5=BC=82=E5=B8=B8=E6=8A=A5=E9=94=99=20(#312)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* 修复了wait4的异常报错
---
 kernel/src/process/syscall.rs              | 5 +++--
 user/libs/libc/src/include/export/unistd.h | 6 ++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/kernel/src/process/syscall.rs b/kernel/src/process/syscall.rs
index 3bbba927..dd71b106 100644
--- a/kernel/src/process/syscall.rs
+++ b/kernel/src/process/syscall.rs
@@ -41,8 +41,9 @@ impl Syscall {
     ) -> Result<usize, SystemError> {
         let ret = unsafe { c_sys_wait4(pid, wstatus, options, rusage) };
         if (ret as isize) < 0 {
-            return Err(SystemError::from_posix_errno(-(ret as isize) as i32)
-                .expect("wait4: Invalid errno"));
+            return Err(
+                SystemError::from_posix_errno((ret as isize) as i32).expect("wait4: Invalid errno")
+            );
         }
         return Ok(ret as usize);
     }
diff --git a/user/libs/libc/src/include/export/unistd.h b/user/libs/libc/src/include/export/unistd.h
index e3f599a6..e5f1dbfd 100644
--- a/user/libs/libc/src/include/export/unistd.h
+++ b/user/libs/libc/src/include/export/unistd.h
@@ -120,6 +120,12 @@ int rm(const char * path);
  */
 void swab(void *restrict src, void *restrict dest, ssize_t nbytes);
 
+/**
+ * @brief   创建pipe
+ *  @param fildes  分别是读端fildes[0]和写端fildes[1]
+ */
+int pipe(int fildes[2]);
+
 pid_t getpid(void);
 
 int dup(int fd);