95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
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* Author: Dai Shili <daisl.fnst@fujitsu.com>
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*/
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/*\
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* [Description]
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*
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* Test the write() system call with O_APPEND.
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*
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* The full description of O_APPEND is in open(2) man-pages:
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* The file is opened in append mode. Before each write(2), the
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* file offset is positioned at the end of the file, as if with lseek(2).
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* The modification of the file offset and the write operation are
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* performed as a single atomic step.
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*
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* Writing 2k data to the file, close it and reopen it with O_APPEND.
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* Verify that the file size is 3k and offset is moved to the end of the file.
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*/
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#include <stdlib.h>
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#include <inttypes.h>
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#include "tst_test.h"
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#include "tst_safe_prw.h"
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#define K1 1024
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#define K2 (K1 * 2)
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#define K3 (K1 * 3)
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#define DATA_FILE "write06_file"
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static int fd = -1;
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static char *write_buf[2];
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static void verify_write(void)
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{
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off_t off;
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struct stat statbuf;
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fd = SAFE_OPEN(DATA_FILE, O_RDWR | O_CREAT | O_TRUNC, 0666);
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SAFE_WRITE(SAFE_WRITE_ALL, fd, write_buf[0], K2);
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SAFE_CLOSE(fd);
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fd = SAFE_OPEN(DATA_FILE, O_RDWR | O_APPEND);
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SAFE_FSTAT(fd, &statbuf);
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if (statbuf.st_size != K2)
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tst_res(TFAIL, "file size is %ld != K2", statbuf.st_size);
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off = SAFE_LSEEK(fd, K1, SEEK_SET);
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if (off != K1)
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tst_brk(TBROK, "Failed to seek to K1");
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SAFE_WRITE(SAFE_WRITE_ALL, fd, write_buf[1], K1);
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off = SAFE_LSEEK(fd, 0, SEEK_CUR);
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if (off != K3)
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tst_res(TFAIL, "Wrong offset after write %zu expected %u", off, K3);
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else
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tst_res(TPASS, "Offset is correct after write %zu", off);
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SAFE_FSTAT(fd, &statbuf);
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if (statbuf.st_size != K3)
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tst_res(TFAIL, "Wrong file size after append %zu expected %u", statbuf.st_size, K3);
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else
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tst_res(TPASS, "Correct file size after append %u", K3);
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SAFE_CLOSE(fd);
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}
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static void setup(void)
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{
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memset(write_buf[0], 0, K2);
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memset(write_buf[1], 1, K1);
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}
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static void cleanup(void)
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{
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if (fd != -1)
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SAFE_CLOSE(fd);
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SAFE_UNLINK(DATA_FILE);
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}
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static struct tst_test test = {
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.needs_tmpdir = 1,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = verify_write,
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.bufs = (struct tst_buffers[]) {
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{&write_buf[0], .size = K2},
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{&write_buf[1], .size = K1},
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{}
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}
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};
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