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common: add pidfd related methods

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Add functions to open pidfds, i.e. file descriptors representing
processes, for process ids and vice versa. Both functions work
an array of fds/pids, stop on error and return the number of
successfully handled items.
This commit is contained in:
Christian Kellner
2019-10-04 17:34:53 +02:00
parent 4b59818fd4
commit 5398dd1d19
4 changed files with 266 additions and 0 deletions
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53
common/common-pidfds.h Normal file
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/*
Copyright (c) 2017-2019, Feral Interactive
Copyright (c) 2019, Red Hat
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of Feral Interactive nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
/* Open pidfds for up to count process ids specified in pids. The
* pointer fds needs to point to an array with at least count
* entries. Will stop when it encounters an error (and sets errno).
* Returns the number of successfully opened pidfds (or -1 in case
* of other errors. */
int open_pidfds(pid_t *pids, int *fds, int count);
/* Translate up to count process ids to the corresponding process ids.
* The pointer pids needs to point to an array with at least count
* entries. Will stop when it encounters an error (and sets errno).
* Returns the number of successfully translated pidfds (or -1 in
* case of other errors. */
int pidfds_to_pids(int *fds, pid_t *pids, int count);
/* Helper to open the fdinfo directory for the current process, i.e.
* does open("/proc/self/fdinfo", ...). Returns the file descriptor
* for the directory, ownership is transferred and caller needs to
* call close on it. */
int open_fdinfo_dir(void);