111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
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// 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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* 07/2001 Ported by Wayne Boyer
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*/
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/*\
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* [Description]
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*
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* Testcase to check the basic functionality of dup2().
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*
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* - Attempt to dup2() on an open file descriptor.
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* - Attempt to dup2() on a close file descriptor.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "tst_test.h"
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#include "tst_safe_macros.h"
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static char filename0[40], filename1[40];
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static int fd0 = -1, fd1 = -1;
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static struct tcase {
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char *desc;
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int is_close;
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} tcases[] = {
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{"Test duping over an open fd", 0},
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{"Test duping over a close fd", 1},
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};
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static void run(unsigned int i)
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{
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int fd2, rval;
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char buf[40];
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struct tcase *tc = tcases + i;
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tst_res(TINFO, "%s", tc->desc);
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fd0 = SAFE_CREAT(filename0, 0666);
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SAFE_WRITE(SAFE_WRITE_ALL, fd0, filename0, strlen(filename0));
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SAFE_CLOSE(fd0);
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fd1 = SAFE_CREAT(filename1, 0666);
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SAFE_WRITE(SAFE_WRITE_ALL, fd1, filename1, strlen(filename1));
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fd0 = SAFE_OPEN(filename0, O_RDONLY);
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SAFE_FCNTL(fd0, F_SETFD, 1);
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if (tc->is_close) {
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/* SAFE_CLOSE() sets the fd to -1 avoid it here */
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rval = fd1;
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SAFE_CLOSE(rval);
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}
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TEST(dup2(fd0, fd1));
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fd2 = TST_RET;
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if (TST_RET == -1) {
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tst_res(TFAIL, "call failed unexpectedly");
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goto free;
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}
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if (fd1 != fd2) {
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tst_res(TFAIL, "file descriptors don't match");
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goto free;
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}
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memset(buf, 0, sizeof(buf));
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SAFE_READ(0, fd2, buf, sizeof(buf));
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if (strcmp(buf, filename0) != 0)
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tst_res(TFAIL, "read from file got bad data");
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else
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tst_res(TPASS, "test the content of file is correct");
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rval = SAFE_FCNTL(fd2, F_GETFD);
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if (rval != 0)
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tst_res(TFAIL, "the FD_CLOEXEC flag is %#x, expected 0x0",
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rval);
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else
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tst_res(TPASS, "test the FD_CLOEXEC flag is correct");
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free:
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SAFE_CLOSE(fd0);
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SAFE_CLOSE(fd1);
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SAFE_UNLINK(filename0);
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SAFE_UNLINK(filename1);
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}
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static void setup(void)
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{
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int pid;
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pid = getpid();
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sprintf(filename0, "dup203.file0.%d\n", pid);
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sprintf(filename1, "dup203.file1.%d\n", pid);
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}
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static void cleanup(void)
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{
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close(fd0);
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close(fd1);
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}
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static struct tst_test test = {
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.setup = setup,
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.tcnt = ARRAY_SIZE(tcases),
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.needs_tmpdir = 1,
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.test = run,
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.cleanup = cleanup,
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};
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