diff options
author | Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> | 2023-08-24 13:42:19 -0300 |
---|---|---|
committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-09-05 13:08:59 -0300 |
commit | e7190fc73dbc8a1f8f94f8ccacd9a190fa5e609c (patch) | |
tree | 0070895e116c7250463b90b643f8727466bfbb5b /sysdeps/unix/sysv/linux/procutils.h | |
parent | 0d6f9f626521678f330f8bfee89e1cdb7e2b1062 (diff) | |
download | glibc-e7190fc73dbc8a1f8f94f8ccacd9a190fa5e609c.tar.gz glibc-e7190fc73dbc8a1f8f94f8ccacd9a190fa5e609c.tar.xz glibc-e7190fc73dbc8a1f8f94f8ccacd9a190fa5e609c.zip |
linux: Add pidfd_getpid
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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/procutils.h')
-rw-r--r-- | sysdeps/unix/sysv/linux/procutils.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/procutils.h b/sysdeps/unix/sysv/linux/procutils.h new file mode 100644 index 0000000000..b3c2f6fb55 --- /dev/null +++ b/sysdeps/unix/sysv/linux/procutils.h @@ -0,0 +1,43 @@ +/* Utilities functions to read/parse Linux procfs and sysfs. + Copyright (C) 2023 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef _PROCUTILS_H +#define _PROCUTILS_H + +#include <stdbool.h> + +typedef int (*procutils_closure_t) (const char *line, void *arg); + +#define PROCUTILS_MAX_LINE_LEN 256 + +/* Open and read the path FILENAME, line per line, and call CLOSURE with + argument ARG on each line. The read is done with a static buffer, + with non-cancellable calls, and the line is null terminated. + + The CLOSURE should return 0 if the read should continue, otherwise the + the function should stop and return early. + + The '\n' is not included in the CLOSURE input argument and lines longer + than PROCUTILS_MAX_LINE_LEN characteres are ignored. + + It returns true in case the file is fully read or false if CLOSURE + returns a value diferent than 0. */ +bool procutils_read_file (const char *filename, procutils_closure_t closure, + void *arg) attribute_hidden; + +#endif |