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57 lines
2.0 KiB
C
57 lines
2.0 KiB
C
/*
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* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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/* Check if any fd past stderr is valid; if true, print warning on stderr and return -1
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*
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* Note: check without accessing /proc since:
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* - non-portable
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* - may cause creation of temporary file descriptors
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*/
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int main(int argc, char** argv) {
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int errors = 0;
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int rc = 0;
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char buf[128];
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int max_fd = (int)sysconf(_SC_OPEN_MAX);
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if (max_fd == -1) {
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snprintf(buf, sizeof(buf), "*** sysconf(_SC_OPEN_MAX) failed? (%d) ***\n", errno);
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rc = write(2, buf, strlen(buf));
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max_fd = 10000;
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}
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// We start after stderr fd
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for (int fd = 3; fd < max_fd; fd++) {
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if (fcntl(fd, F_GETFD, 0) >= 0) {
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// Error: found valid file descriptor
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errors++;
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snprintf(buf, sizeof(buf), "*** Parent leaked file descriptor %d ***\n", fd);
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rc = write(2, buf, strlen(buf));
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}
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}
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return errors > 0 ? -1 : 0;
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}
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