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https://github.com/checkpoint-restore/criu
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30224abcb6
The flags are only one bit in the kernel (close-on-exec, all the rest are not per-fd, but per-file), but for simplicity I save it in a char field. Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
#ifndef UTIL_NET_H_
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#define UTIL_NET_H_
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#include <sys/socket.h>
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#include <sys/un.h>
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#define UNIX_PATH_MAX (sizeof(struct sockaddr_un) - \
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(size_t)((struct sockaddr_un *) 0)->sun_path)
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#ifndef SO_PEEK_OFF
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#define SO_PEEK_OFF 42
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#endif
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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 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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char msg[CR_SCM_MAX_FD];
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};
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extern int send_fds(int sock, struct sockaddr_un *saddr, int saddr_len,
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int *fds, int nr_fds, bool with_flags);
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extern int recv_fds(int sock, int *fds, int nr_fds, char *flags);
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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, false);
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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);
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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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