I/O Primitives (The GNU C Library)
www.gnu.org › software › libc13.2 Input and Output Primitives. This section describes the functions for performing primitive input and output operations on file descriptors: read, write, and lseek. These functions are declared in the header file unistd.h . Data Type: ssize_t. This data type is used to represent the sizes of blocks that can be read or written in a single ...