diff options
Diffstat (limited to 'src/socket_wrapper.c')
| -rw-r--r-- | src/socket_wrapper.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/socket_wrapper.c b/src/socket_wrapper.c index 00518c1..0b13a8c 100644 --- a/src/socket_wrapper.c +++ b/src/socket_wrapper.c @@ -5186,6 +5186,16 @@ static int swrap_dup2(int fd, int newfd) return libc_dup2(fd, newfd); } + if (fd == newfd) { + /* + * According to the manpage: + * + * "If oldfd is a valid file descriptor, and newfd has the same + * value as oldfd, then dup2() does nothing, and returns newfd." + */ + return newfd; + } + if (find_socket_info(newfd)) { /* dup2() does an implicit close of newfd, which we * need to emulate */ |