X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=blobdiff_plain;f=src%2Funistd%2Fdup3.c;h=1f7134b3dcbf7ea16390b543f38798c4b33549b0;hp=18f6fccef24fb12fdc83a72958d3423618ae7a1d;hb=892cafff665b44d238e3b664f61ca38dd965cba6;hpb=708c91f4e9be2cfd6d35e71361956e13f3201b85

diff --git a/src/unistd/dup3.c b/src/unistd/dup3.c
index 18f6fcce..1f7134b3 100644
--- a/src/unistd/dup3.c
+++ b/src/unistd/dup3.c
@@ -1,10 +1,21 @@
 #define _GNU_SOURCE
 #include <unistd.h>
 #include <errno.h>
+#include <fcntl.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;
-	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);
 }
+
+weak_alias(__dup3, dup3);