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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869// SPDX-License-Identifier: GPL-2.0#include <unistd.h>#include <stdbool.h>#include <errno.h>#include <linux/kernel.h>#include <internal/lib.h>
unsigned int page_size;
static ssize_t ion(bool is_read, int fd, void *buf, size_t n){ void *buf_start = buf; size_t left = n;
while (left) { /* buf must be treated as const if !is_read. */ ssize_t ret = is_read ? read(fd, buf, left) : write(fd, buf, left);
if (ret < 0 && errno == EINTR) continue; if (ret <= 0) return ret;
left -= ret; buf += ret; }
BUG_ON((size_t)(buf - buf_start) != n); return n;}
/* * Read exactly 'n' bytes or return an error. */ssize_t readn(int fd, void *buf, size_t n){ return ion(true, fd, buf, n);}
ssize_t preadn(int fd, void *buf, size_t n, off_t offs){ size_t left = n;
while (left) { ssize_t ret = pread(fd, buf, left, offs);
if (ret < 0 && errno == EINTR) continue; if (ret <= 0) return ret;
left -= ret; buf += ret; offs += ret; }
return n;}
/* * Write exactly 'n' bytes or return an error. */ssize_t writen(int fd, const void *buf, size_t n){ /* ion does not modify buf. */ return ion(false, fd, (void *)buf, n);}