offset(o1) - phpMan

_llseek (2)          - reposition read/write file offset
ftell (3p)           - return a file offset in a stream
llseek (2)           - reposition read/write file offset
lseek (2)            - reposition read/write file offset
lseek (3p)           - move the read/write file offset
lseek64 (3)          - reposition 64-bit read/write file offset
offsetof (3)         - offset of a structure member
pcre2_set_offset_limit (3) - Perl-compatible regular expressions (revised API)
posix_mem_offset (3p) - find offset and length of a mapped typed memory block...
pread (2)            - read from or write to a file descriptor at a given offset
pread64 (2)          - read from or write to a file descriptor at a given offset
pwrite (2)           - read from or write to a file descriptor at a given offset
pwrite64 (2)         - read from or write to a file descriptor at a given offset