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lseek is a system call, but fseek is a C function belonging to the ANSI C standard library, and included in the file stdio.h
lseek uses file descriptor (return by open system call), but fseek uses pointer to FILE structure (return by fopen ANSI C library function) (though file desctor and FILE * can be used interchangeably several times).
System calls are to communicate directly with an operating system. Generally, system calls are slower than normal function calls.
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