iovec

Standard C library (libc)

#include <sys/uio.h>

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

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)).

POSIX.1-2008.

POSIX.1-2001.

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

process_madvise(2), readv(2)