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Remove a compiler warning in some environments

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POSIX mandates that `cmsg_len` in `struct cmsghdr` is a `socklen_t`,
which is an `unsigned int`. Musl libc as used in Alpine implements
this; Glibc ignores the spec and makes it a `size_t` ie `unsigned long`.
To avoid the `-Wformat=` warning from the `%lu` on Alpine, cast this
to an `unsigned long` always.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
This commit is contained in:
Justin Cormack
2017-01-24 14:06:15 +00:00
parent ce450bcc6c
commit 6ba5f5f9b8
1 changed files with 1 additions and 1 deletions
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libcontainer/utils/cmsg.c
+1 -1
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@@ -131,7 +131,7 @@ struct file_t recvfd(int sockfd)
if (cmsg->cmsg_type != SCM_RIGHTS)
error("recvfd: expected SCM_RIGHTS in cmsg: %d", cmsg->cmsg_type);
if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
error("recvfd: expected correct CMSG_LEN in cmsg: %lu", cmsg->cmsg_len);
error("recvfd: expected correct CMSG_LEN in cmsg: %lu", (unsigned long)cmsg->cmsg_len);
fdptr = (int *) CMSG_DATA(cmsg);
if (!fdptr || *fdptr < 0)