X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Funistd%2Fdup3.c;h=f919f79125a624c4d47c1cb50a103f82e0ba576f;hb=613ccabeb0c10ac818e36ef53e09753d23785cbf;hp=18f6fccef24fb12fdc83a72958d3423618ae7a1d;hpb=dc62790deec183697489d5fddea03c82f725e7fd;p=musl

diff --git a/src/unistd/dup3.c b/src/unistd/dup3.c
index 18f6fcce..f919f791 100644
--- a/src/unistd/dup3.c
+++ b/src/unistd/dup3.c
@@ -1,10 +1,24 @@
 #define _GNU_SOURCE
 #include <unistd.h>
 #include <errno.h>
+#include <fcntl.h>
 #include "syscall.h"
 
-int dup3(int old, int new, int flags) {
+int __dup3(int old, int new, int flags)
+{
 	int r;
+#ifdef SYS_dup2
+	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);
+#else
 	while ((r=__syscall(SYS_dup3, old, new, flags))==-EBUSY);
+#endif
 	return __syscall_ret(r);
 }
+
+weak_alias(__dup3, dup3);