If you had used read(2) and write(2) syscalls, you would have needed to allocate and use an intermediate buffer. Many servers, including the Telnet and SSH servers that come with FreeBSD, do this to store the hostname in a log file for future reference by the administrator. The default is to log to the AUTH facility. This way, you have made a copy of your file without having used any intermediate buffer: there is no intermediate buffer allocated in userland, even if the copy is done in userland.
When both of the file descriptors are files on a storage device, you can use the mmap(2) syscall that is based on the Mach micro-kernel virtual memory implementation that is at the heart of the FreeBSD kernel: just mmap the input file descriptor to get a pointer corresponding to the input file data, open a file descriptor to create the output file, extend the size of the output file to the size of the input file (for instance with lseek(2) to go to the second last position of the file, followed by writing a null byte), use mmap(2) on the output file descriptor to get a pointer corresponding to the output file content, and finally use memcpy(3) or bcopy(3) with those two pointers to copy the input file content to the output file content. So, I am thinking to change filesystem of my /home directory. When I mount this ext4 partition in FreeBSD and copy and move some file, it creates some problems and Linux complain about orphan links (Screenshot is attached). same as preservemode,ownership,timestamps. My data is in separate drive mounted as /home with ext4 filesystem. dev/gpt/oam (/oam for short), an Operations. output updates using the specified FORMAT -log-fileFILE log what were. Cause cp to preserve the following attributes of each source file in the copy: modification time, access time, file flags, file mode, ACL, user ID, and group ID, as allowed by permissions. dev/gpt/junos (/junos for short) volume that is used to run Junos OS and to store the configuration and log files.
#Freebsd copy log file windows#
As said in the comments, when one file descriptor is a file on a storage device and another is a network socket, you can use the sendfile(2) syscall that has been improved by Netflix on FreeBSD to transfer data with zero-copy at the userspace level. Copy the file from /etc into /nsconfig Edit the file in /nsconfig as appropriate If in HA, force an HA file sync (or wait for HA file sync to complete). Microsoft has been working on a major redesign of File Explorer for Windows 11, and it has finally teased the new look during its Build 2023 developers. DESCRIPTION Rsync is a fast and extraordinarily versatile file copying tool.
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