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e7190fc73d
This interface allows to obtain the associated process ID from the
process file descriptor. It is done by parsing the procps fdinfo
information. Its prototype is:
pid_t pidfd_getpid (int fd)
It returns the associated pid or -1 in case of an error and sets the
errno accordingly. The possible errno values are those from open, read,
and close (used on procps parsing), along with:
- EBADF if the FD is negative, does not have a PID associated, or if
the fdinfo fields contain a value larger than pid_t.
- EREMOTE if the PID is in a separate namespace.
- ESRCH if the process is already terminated.
Checked on x86_64-linux-gnu on Linux 4.15 (no CLONE_PIDFD or waitid
support), Linux 5.4 (full support), and Linux 6.2.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
/* Utilities functions to read/parse Linux procfs and sysfs.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _PROCUTILS_H
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#define _PROCUTILS_H
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#include <stdbool.h>
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typedef int (*procutils_closure_t) (const char *line, void *arg);
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#define PROCUTILS_MAX_LINE_LEN 256
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/* Open and read the path FILENAME, line per line, and call CLOSURE with
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argument ARG on each line. The read is done with a static buffer,
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with non-cancellable calls, and the line is null terminated.
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The CLOSURE should return 0 if the read should continue, otherwise the
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the function should stop and return early.
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The '\n' is not included in the CLOSURE input argument and lines longer
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than PROCUTILS_MAX_LINE_LEN characteres are ignored.
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It returns true in case the file is fully read or false if CLOSURE
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returns a value diferent than 0. */
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bool procutils_read_file (const char *filename, procutils_closure_t closure,
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void *arg) attribute_hidden;
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#endif
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