78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) International Business Machines Corp., 2001
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* Ported to LTP: Wayne Boyer
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*/
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/*
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* 1. creat() a file using 0444 mode, write to the fildes, write
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* should return a positive count.
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*
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* 2. creat() should truncate a file to 0 bytes if it already
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* exists, and should not fail.
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*
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include "tst_test.h"
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static char filename[40];
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static int fd;
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static void setup(void)
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{
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sprintf(filename, "creat01.%d", getpid());
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}
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static struct tcase {
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int mode;
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} tcases[] = {
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{0644},
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{0444}
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};
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static void verify_creat(unsigned int i)
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{
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struct stat buf;
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char c;
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fd = SAFE_CREAT(filename, tcases[i].mode);
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SAFE_STAT(filename, &buf);
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if (buf.st_size != 0)
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tst_res(TFAIL, "creat() failed to truncate file to 0 bytes");
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else
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tst_res(TPASS, "creat() truncated file to 0 bytes");
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if (write(fd, "A", 1) != 1)
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tst_res(TFAIL | TERRNO, "write was unsuccessful");
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else
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tst_res(TPASS, "file was created and written to successfully");
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if (read(fd, &c, 1) != -1)
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tst_res(TFAIL, "read succeeded unexpectedly");
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else
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tst_res(TPASS | TERRNO, "read failed expectedly");
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SAFE_CLOSE(fd);
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}
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static void cleanup(void)
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{
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if (fd > 0)
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SAFE_CLOSE(fd);
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}
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static struct tst_test test = {
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.tcnt = 2,
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.test = verify_creat,
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.needs_tmpdir = 1,
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.cleanup = cleanup,
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.setup = setup,
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};
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