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socket-util: remove unused {send,receive}_many_fds*()

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These were introduced as part of the effort of sd-executor
worker pool (#29566), which never landed due to unsignificant
performance improvement. Let's just remove the unused
helpers. If that work ever gets resurrected they can be
restored from this commit pretty easily.
This commit is contained in:
Mike Yuan
2026-02-17 14:56:00 +09:00
committed by Yu Watanabe
parent d9e078fe68
commit fad273450a
3 changed files with 0 additions and 205 deletions
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src/basic/socket-util.c
-115
View File
@@ -970,53 +970,6 @@ int getpeerpidref(int fd, PidRef *ret) {
return pidref_set_pidfd_consume(ret, pidfd);
}
ssize_t send_many_fds_iov_sa(
int transport_fd,
int *fds_array, size_t n_fds_array,
const struct iovec *iov, size_t iovlen,
const struct sockaddr *sa, socklen_t len,
int flags) {
_cleanup_free_ struct cmsghdr *cmsg = NULL;
struct msghdr mh = {
.msg_name = (struct sockaddr*) sa,
.msg_namelen = len,
.msg_iov = (struct iovec *)iov,
.msg_iovlen = iovlen,
};
ssize_t k;
assert(transport_fd >= 0);
assert(fds_array || n_fds_array == 0);
/* The kernel will reject sending more than SCM_MAX_FD FDs at once */
if (n_fds_array > SCM_MAX_FD)
return -E2BIG;
/* We need either an FD array or data to send. If there's nothing, return an error. */
if (n_fds_array == 0 && !iov)
return -EINVAL;
if (n_fds_array > 0) {
mh.msg_controllen = CMSG_SPACE(sizeof(int) * n_fds_array);
mh.msg_control = cmsg = malloc(mh.msg_controllen);
if (!cmsg)
return -ENOMEM;
*cmsg = (struct cmsghdr) {
.cmsg_len = CMSG_LEN(sizeof(int) * n_fds_array),
.cmsg_level = SOL_SOCKET,
.cmsg_type = SCM_RIGHTS,
};
memcpy(CMSG_DATA(cmsg), fds_array, sizeof(int) * n_fds_array);
}
k = sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags);
if (k < 0)
return (ssize_t) -errno;
return k;
}
ssize_t send_one_fd_iov_sa(
int transport_fd,
int fd,
@@ -1072,74 +1025,6 @@ int send_one_fd_sa(
return (int) send_one_fd_iov_sa(transport_fd, fd, NULL, 0, sa, len, flags);
}
ssize_t receive_many_fds_iov(
int transport_fd,
struct iovec *iov, size_t iovlen,
int **ret_fds_array, size_t *ret_n_fds_array,
int flags) {
CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int) * SCM_MAX_FD)) control;
struct msghdr mh = {
.msg_control = &control,
.msg_controllen = sizeof(control),
.msg_iov = iov,
.msg_iovlen = iovlen,
};
_cleanup_free_ int *fds_array = NULL;
size_t n_fds_array = 0;
struct cmsghdr *cmsg;
ssize_t k;
assert(transport_fd >= 0);
assert(ret_fds_array);
assert(ret_n_fds_array);
/*
* Receive many FDs via @transport_fd. We don't care for the transport-type. We retrieve all the FDs
* at once. This is best used in combination with send_many_fds().
*/
k = recvmsg_safe(transport_fd, &mh, MSG_CMSG_CLOEXEC | flags);
if (k < 0)
return k;
CMSG_FOREACH(cmsg, &mh)
if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
size_t n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
if (!GREEDY_REALLOC_APPEND(fds_array, n_fds_array, CMSG_TYPED_DATA(cmsg, int), n)) {
cmsg_close_all(&mh);
return -ENOMEM;
}
}
if (n_fds_array == 0) {
cmsg_close_all(&mh);
/* If didn't receive an FD or any data, return an error. */
if (k == 0)
return -EIO;
}
*ret_fds_array = TAKE_PTR(fds_array);
*ret_n_fds_array = n_fds_array;
return k;
}
int receive_many_fds(int transport_fd, int **ret_fds_array, size_t *ret_n_fds_array, int flags) {
ssize_t k;
k = receive_many_fds_iov(transport_fd, NULL, 0, ret_fds_array, ret_n_fds_array, flags);
if (k == 0)
return 0;
/* k must be negative, since receive_many_fds_iov() only returns a positive value if data was received
* through the iov. */
assert(k < 0);
return (int) k;
}
ssize_t receive_one_fd_iov(
int transport_fd,
struct iovec *iov, size_t iovlen,