Lseek64int

Lseek64int is a system call in various Unix-like operating systems that allows a process to change its file offset to a 64-bit value. It was introduced to provide a way for applications to access files greater than 2GB in size.

The system call is used as a combination of the legacy lseek and lseek64 system calls. When lseek64int is invoked, the low 32 bits of the offset are taken from the legacy lseek system call, while the high 32 bits are taken from the lseek64 system call. The resulting 64-bit offset is then used to change the file offset.

The lseek64int system call is commonly used in Unix-like operating systems that support 64-bit offsets, including Linux and Solaris. It is typically used in conjunction with file systems that support large file sizes, such as the ext4 and XFS file systems.

The use of lseek64int can help to prevent the limitations of the legacy lseek system call, which only supported 32-bit offsets. However, it may also result in reduced performance due to the need to perform additional operations to handle the 64-bit offset.

In Linux, the lseek64int system call is an alias for the lllseek64 system call, which provides similar functionality. The lseek64int system call is declared in the <linux/fs.h> header file and is typically used with the F_IMMUTABLE or F_SEAL_DEFRAG file flags to seal the file's contents and defend against excessive seeks.

Overall, lseek64int is a useful system call for applications that need to access large files or perform 64-bit file operations. However, its use may have performance implications and should be considered carefully in high-performance applications.