mirror of
https://github.com/checkpoint-restore/criu
synced 2025-08-27 04:18:27 +00:00
60738eaa78
Remove getting opts from descriptors out from scm engine, this stuff is pure criu thing, so make it collect the data. The tricky change here is that parasite code needs memory to keep fd_opts on. The memory is taken from parasite args region, which is now bigger than it used to be. But that's not a big deal, as previously this space was allocated on the parasite stack (!, but with smaller chunks). On the other hand, now we have one memcpy less, as opts are put directly into the destination buffer. travis-ci: success for files: Rework send/recv-fds to be more generic Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
#ifndef __COMMON_SCM_H__
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#define __COMMON_SCM_H__
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#include <stdint.h>
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#include <stdbool.h>
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#include <sys/un.h>
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/*
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* Because of kernel doing kmalloc for user data passed
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* in SCM messages, and there is kernel's SCM_MAX_FD as a limit
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* for descriptors passed at once we're trying to reduce
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* the pressue on kernel memory manager and use predefined
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* known to work well size of the message buffer.
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*/
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#define CR_SCM_MSG_SIZE (1024)
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#define CR_SCM_MAX_FD (252)
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struct scm_fdset {
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struct msghdr hdr;
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struct iovec iov;
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char msg_buf[CR_SCM_MSG_SIZE];
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};
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#ifndef F_GETOWNER_UIDS
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#define F_GETOWNER_UIDS 17
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#endif
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extern int send_fds(int sock, struct sockaddr_un *saddr, int len,
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int *fds, int nr_fds, void *data, unsigned ch_size);
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extern int recv_fds(int sock, int *fds, int nr_fds,
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void *data, unsigned ch_size);
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static inline int send_fd(int sock, struct sockaddr_un *saddr, int saddr_len, int fd)
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{
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return send_fds(sock, saddr, saddr_len, &fd, 1, NULL, 0);
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}
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static inline int recv_fd(int sock)
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{
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int fd, ret;
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ret = recv_fds(sock, &fd, 1, NULL, 0);
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if (ret)
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return -1;
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return fd;
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}
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#endif
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