fix special-case breakage in popen due to reversed argument order

diff --git a/src/stdio/popen.c b/src/stdio/popen.c
index 28ff23fd1614422bdbeb907529b08c7ec5c6b413..92cb57ee937b7ea3908de2c0de86ced5eefb3d8d 100644 (file)
--- a/src/stdio/popen.c
+++ b/src/stdio/popen.c
@@ -39,7 +39,7 @@ FILE *popen(const char *cmd, const char *mode)
         * remove the close-on-exec flag in the child without also creating
         * a file descriptor leak race condition in the parent. */
        if (p[1-op] == 1-op) {
-               int tmp = fcntl(F_DUPFD_CLOEXEC, 1-op, 0);
+               int tmp = fcntl(1-op, F_DUPFD_CLOEXEC, 0);
                if (tmp < 0) {
                        e = errno;
                        goto fail;