greatly improve freopen behavior

[musl] / src / unistd / dup3.c

diff --git a/src/unistd/dup3.c b/src/unistd/dup3.c
index 18f6fcc..1f7134b 100644 (file)
--- a/src/unistd/dup3.c
+++ b/src/unistd/dup3.c
@@ -1,10 +1,21 @@
 #define _GNU_SOURCE
 #include <unistd.h>
 #include <errno.h>
 #define _GNU_SOURCE
 #include <unistd.h>
 #include <errno.h>

+#include <fcntl.h>

 #include "syscall.h"
 #include "syscall.h"

+#include "libc.h"

 
 

-int dup3(int old, int new, int flags) {
+int __dup3(int old, int new, int flags)
+{

        int r;
        int r;

-       while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
+       if (old==new) return __syscall_ret(-EINVAL);
+       if (flags & O_CLOEXEC) {
+               while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
+               if (r!=-ENOSYS) return __syscall_ret(r);
+       }
+       while ((r=__syscall(SYS_dup2, old, new))==-EBUSY);
+       if (flags & O_CLOEXEC) __syscall(SYS_fcntl, new, F_SETFD, FD_CLOEXEC);

        return __syscall_ret(r);
 }
        return __syscall_ret(r);
 }

+
+weak_alias(__dup3, dup3);