Add a testcase of pipe that child process sends message to parent process. Here we use memcmp() to avoid the output buffer issue. Suggested-by: Thomas Weißschuh <thomas@xxxxxxxx> Suggested-by: Willy Tarreau <w@xxxxxx> Link: https://lore.kernel.org/all/c5de2d13-3752-4e1b-90d9-f58cca99c702@xxxxxxxx/ Signed-off-by: Yuan Tan <tanyuan@xxxxxxxxxxx> --- tools/testing/selftests/nolibc/nolibc-test.c | 35 ++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 03b1d30f5507..2653ab8d5124 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -767,6 +767,41 @@ int test_mmap_munmap(void) return ret; } +int test_pipe(void) +{ + const char *const msg = "hello, nolibc"; + int pipefd[2]; + char buf[32]; + pid_t pid; + ssize_t len; + + if (pipe(pipefd) == -1) + return 1; + + pid = fork(); + + switch (pid) { + case -1: + return 1; + + case 0: + close(pipefd[0]); + write(pipefd[1], msg, strlen(msg)); + close(pipefd[1]); + exit(EXIT_SUCCESS); + + default: + close(pipefd[1]); + len = read(pipefd[0], buf, sizeof(buf)); + close(pipefd[0]); + waitpid(pid, NULL, 0); + + if (len != strlen(msg)) + return 1; + return !!memcmp(buf, msg, len); + } +} + /* Run syscall tests between IDs <min> and <max>. * Return 0 on success, non-zero on failure. -- 2.34.1
