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80c3e28528
Add a testcase for poll() on hist file. This introduces a helper binary to the ftracetest, because there is no good way to reliably execute poll() on hist file. Cc: Shuah Khan <shuah@kernel.org> Cc: Tom Zanussi <zanussi@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://lore.kernel.org/173547867935.569911.10127126796879854182.stgit@devnote2 Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
74 lines
1.3 KiB
C
74 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Simple poll on a file.
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*
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* Copyright (c) 2024 Google LLC.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define BUFSIZE 4096
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/*
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* Usage:
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* poll [-I|-P] [-t timeout] FILE
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*/
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int main(int argc, char *argv[])
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{
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struct pollfd pfd = {.events = POLLIN};
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char buf[BUFSIZE];
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int timeout = -1;
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int ret, opt;
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while ((opt = getopt(argc, argv, "IPt:")) != -1) {
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switch (opt) {
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case 'I':
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pfd.events = POLLIN;
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break;
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case 'P':
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pfd.events = POLLPRI;
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break;
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case 't':
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timeout = atoi(optarg);
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break;
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default:
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fprintf(stderr, "Usage: %s [-I|-P] [-t timeout] FILE\n",
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argv[0]);
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return -1;
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}
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}
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if (optind >= argc) {
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fprintf(stderr, "Error: Polling file is not specified\n");
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return -1;
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}
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pfd.fd = open(argv[optind], O_RDONLY);
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if (pfd.fd < 0) {
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fprintf(stderr, "failed to open %s", argv[optind]);
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perror("open");
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return -1;
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}
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/* Reset poll by read if POLLIN is specified. */
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if (pfd.events & POLLIN)
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do {} while (read(pfd.fd, buf, BUFSIZE) == BUFSIZE);
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ret = poll(&pfd, 1, timeout);
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if (ret < 0 && errno != EINTR) {
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perror("poll");
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return -1;
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}
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close(pfd.fd);
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/* If timeout happned (ret == 0), exit code is 1 */
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if (ret == 0)
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return 1;
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return 0;
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}
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