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0ce6af9f18
Backport of CL 108537 to 1.9 release branch. We were using file descriptor 100, which requires the Linux kernel to grow the fdtable size. That step may sometimes require a long time, causing the test to fail. Switch to file descriptor 30, which should not require growing the fdtable. Updates #23784 Fixes #25278 Change-Id: I19ea6ab1724ec1807643d5111c44631e20be76b0 Reviewed-on: https://go-review.googlesource.com/111996 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <errno.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 <time.h>
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#include <unistd.h>
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#define fd (30)
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// Tests libgo2.so, which does not export any functions.
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// Read a string from the file descriptor and print it.
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int main(void) {
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int i;
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ssize_t n;
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char buf[20];
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struct timespec ts;
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// The descriptor will be initialized in a thread, so we have to
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// give a chance to get opened.
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for (i = 0; i < 1000; i++) {
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n = read(fd, buf, sizeof buf);
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if (n >= 0)
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break;
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if (errno != EBADF && errno != EINVAL) {
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fprintf(stderr, "BUG: read: %s\n", strerror(errno));
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return 2;
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}
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// An EBADF error means that the shared library has not opened the
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// descriptor yet.
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ts.tv_sec = 0;
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ts.tv_nsec = 1000000;
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nanosleep(&ts, NULL);
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}
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if (n < 0) {
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fprintf(stderr, "BUG: failed to read any data from pipe\n");
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return 2;
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}
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if (n == 0) {
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fprintf(stderr, "BUG: unexpected EOF\n");
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return 2;
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}
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if (n == sizeof buf) {
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n--;
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}
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buf[n] = '\0';
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printf("%s\n", buf);
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return 0;
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}
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