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