Add very basic ftruncate() regression test, with a comment rather more
thorough than the tests regarding what should be tested.
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tools/regression/file/ftruncate/Makefile
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tools/regression/file/ftruncate/Makefile
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# $FreeBSD$
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PROG= ftruncate
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NO_MAN=
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WARNS= 2
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.include <bsd.prog.mk>
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102
tools/regression/file/ftruncate/ftruncate.c
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tools/regression/file/ftruncate/ftruncate.c
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/*-
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* Copyright (c) 2006 Robert N. M. Watson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Very simple regression test. Open a temporary file, then proceed to
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* ftruncate it to various values and check that fstat returns those values.
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* First we run forwards through a set of sizes starting with zero, then back
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* again.
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*
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* Future tests that might be of interest:
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*
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* - Make sure that files grown via ftruncate() return 0 bytes for data
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* reads.
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*
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* - Make sure that we can't ftruncate on a read-only descriptor.
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*
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* - Make sure we get EISDIR on a directory.
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*/
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <unistd.h>
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/*
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* Select various potentially interesting sizes at and around power of 2
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* edges.
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*/
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static off_t sizes[] = {0, 1, 2, 3, 4, 127, 128, 129, 511, 512, 513, 1023,
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1024, 1025, 2047, 2048, 2049, 4095, 4096, 4097, 8191, 8192, 8193, 16383,
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16384, 16385};
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static int size_count = sizeof(sizes) / sizeof(off_t);
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int
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main(int argc, char *argv[])
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{
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char path[PATH_MAX];
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struct stat sb;
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int fd, i;
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snprintf(path, PATH_MAX, "/tmp/ftruncate.XXXXXXXXXXXXX");
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fd = mkstemp(path);
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if (fd < 0)
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err(-1, "makestemp");
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(void)unlink(path);
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if (ftruncate(fd, -1) == 0)
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errx(-1, "ftruncate(fd, -1) succeeded");
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if (errno != EINVAL)
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err(-1, "ftruncate(fd, -1) returned wrong error");
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for (i = 0; i < size_count; i++) {
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if (ftruncate(fd, sizes[i]) < 0)
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err(-1, "ftruncate(%llu) up", sizes[i]);
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if (fstat(fd, &sb) < 0)
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err(-1, "stat");
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if (sb.st_size != sizes[i])
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errx(-1, "fstat(%llu) returned %llu up", sizes[i],
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sb.st_size);
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}
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for (i = size_count - 1; i >= 0; i--) {
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if (ftruncate(fd, sizes[i]) < 0)
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err(-1, "ftruncate(%llu) down", sizes[i]);
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if (fstat(fd, &sb) < 0)
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err(-1, "stat");
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if (sb.st_size != sizes[i])
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errx(-1, "fstat(%llu) returned %llu down", sizes[i],
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sb.st_size);
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}
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close(fd);
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return (0);
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}
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