Florian Fischer
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/// @file t_dup.c
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/// @brief Test the dup syscall
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/// @copyright (c) 2024 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/unistd.h>
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#include <strerror.h>
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#include <string.h>
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int main(int argc, char *argv[])
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{
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char *file = "t_dup_file";
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int fd1, fd2;
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int flags = O_WRONLY | O_CREAT | O_TRUNC;
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mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
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fd1 = open(file, flags, mode);
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if (fd1 < 0) {
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printf("Failed to open file %s: %s\n", file, strerror(errno));
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exit(1);
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}
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fd2 = dup(fd1);
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if (fd2 < 0) {
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printf("Failed to dup fd %d: %s\n", fd1, strerror(errno));
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exit(1);
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}
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if (write(fd1, "foo", 3) != 3) {
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printf("Writing to fd %d failed: %s\n", fd1, strerror(errno));
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exit(1);
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}
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close(fd1);
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if (write(fd2, "bar", 3) != 3) {
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printf("Writing to fd %d failed: %s\n", fd2, strerror(errno));
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exit(1);
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}
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close(fd2);
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fd1 = open(file, O_RDONLY, 0);
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if (fd1 < 0) {
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printf("Failed to open file %s: %s\n", file, strerror(errno));
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exit(1);
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}
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char buf[7];
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buf[6] = 0;
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if (read(fd1, &buf, 6) < 0) {
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printf("Reading from fd %d failed: %s\n", fd1, strerror(errno));
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exit(1);
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}
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if (strcmp(buf, "foobar") != 0) {
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printf("Unexpected file content: %s\n", buf);
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exit(1);
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}
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unlink(file);
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return 0;
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}
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