iovec(3type)                                                      iovec(3type)

NAME
       iovec - Vector I/O data structure

LIBRARY
       Standard C library (libc)

SYNOPSIS
       #include <sys/uio.h>

       struct iovec {
           void   *iov_base;  /* Starting address */
           size_t  iov_len;   /* Size of the memory pointed to by iov_base. */
       };

DESCRIPTION
       Describes a region of memory, beginning at iov_base address and with
       the size of iov_len bytes.  System calls use arrays of this structure,
       where each element of the array represents a memory region, and the
       whole array represents a vector of memory regions.  The maximum number
       of iovec structures in that array is limited by IOV_MAX (defined in
       <limits.h>, or accessible via the call sysconf(_SC_IOV_MAX)).

STANDARDS
       POSIX.1-2024.

HISTORY
       SUSv1, POSIX.1-2001 XSI.

NOTES
       The following header also provides this type: <sys/socket.h>.

SEE ALSO
       process_madvise(2), readv(2)

Linux man-pages 6.19              2026-01-09                      iovec(3type)