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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | FILES | SEE ALSO | COLOPHON |
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PROCPS_MISC(3) Library Functions Manual PROCPS_MISC(3)
procps_misc - API for miscellaneous information in the /proc
filesystem
#include <libproc2/misc.h>
Platform Particulars
long procps_cpu_count (void);
long procps_hertz_get (void);
unsigned int procps_pid_length (void);
int procps_linux_version (void);
Runtime Particulars
int procps_container_uptime (double *uptime_secs);
int procps_loadavg (double *av1, double *av5, double *av15);
int procps_uptime (double *uptime_secs, double *idle_secs);
int procps_uptime_snprint ( char *restrict str, size_t size, double uptime_secs, const int pretty);
char *procps_uptime_sprint (void);
char *procps_uptime_sprint_short (void);
int procps_users (void);
Namespace Particulars
int procps_ns_get_id (const char *name);
const char *procps_ns_get_name (int id);
int procps_ns_read_pid (int pid, struct procps_ns *nsp);
Link with -lproc2.
procps_cpu_count() returns the number of CPUs that are currently
online as sysconf(_SC_NPROCESSORS_ONLY) or an assumed 1.
procps_hertz_get() returns the number of clock ticks per second
as sysconf(_SC_CLK_TCK) or an assumed 100. Dividing tics by this
value yields seconds.
procps_pid_length() returns the maximum string length for a PID
on the system. For example, if the largest possible PID value on
was 123, then the length would be 3. If the file
/proc/sys/kernel/pid_max is unreadable, the value is assumed to
be 5.
procps_linux_version() returns the current Linux version as an
encoded integer. On non-Linux systems that have an emulated proc
filesystem this function returns the version of the Linux
emulation instead. The version consists of three positive
integers representing the major, minor and patch levels. The
following macros are provided for encoding a given Linux version
or separating out the components of the current version.
LINUX_VERSION( major , minor , patch )
LINUX_VERSION_MAJOR( ver )
LINUX_VERSION_MINOR( ver )
LINUX_VERSION_PATCH( ver )
procps_loadavg() fetches the system load average and puts the 1,
5 and 15 minute averages into location(s) specified by any
pointer which is not NULL.
procps_container_uptime() returns the uptime of a container into
location specified by the pointer if it is not NULL. This is
currently determined by the elapsed time of PID 1, which could be
given with the command:
$ ps -o etimes 1
ELAPSED
12345
There is no concept of idle time in a container so
procps_container_uptime() doesn't have that parameter.
procps_uptime() returns uptime and/or idle seconds into
location(s) specified by any pointer which is not NULL. The
sprint varieties return a human-readable string in one of two
forms.
HH:MM:SS up HH:MM, # users, load average: 1, 5, 15 MM
averages
up HH, MM
procps_uptime_snprint() Uses the given buffer str of size length
to fill in the uptime string instead of a statically allocated
buffer. The function requires the uptime_secs value, which can
be obtained from procps_uptime() or procps_container_uptime() and
the pretty flag determines if the output is standard or
pretty/short.
procps_users() returns the number of users on the system. This
value comes from sd_get_sessions(3) and counting the sessions of
user, user-early and user-incomplete class or enumerating through
getutent(3).
procps_ns_get_id() returns the integer id (enum namespace_type)
of the namespace for the given namespace name.
procps_ns_get_name() returns the name of the namespace for the
given id (enum namespace_type).
procps_ns_read_pid() returns the inodes for the namespaces of the
given process in the procps_ns structure pointed to by nsp.
Those inodes will appear in the order proscribed by enum
namespace_type.
enum namespace_type {
PROCPS_NS_CGROUP,
PROCPS_NS_IPC,
PROCPS_NS_MNT,
PROCPS_NS_NET,
PROCPS_NS_PID,
PROCPS_NS_TIME,
PROCPS_NS_USER,
PROCPS_NS_UTS
};
Functions Returning an ‘int’ or ‘long’
An error will be indicated by a negative number that is always
the inverse of some well known errno.h value.
Functions Returning an ‘address’
An error will be indicated by a NULL return pointer with the
reason found in the formal errno value.
/proc/loadavg
The raw values for load average.
/proc/sys/kernel/osrelease
Contains the release version of the Linux kernel or proc
filesystem.
/proc/sys/kernel/pid_max
Contains the value at which PIDs wrap around, one greater
than the maximum PID value.
/proc/uptime
The raw values for system uptime and idle time.
/proc/PID/ns
contains the set of namespaces for a particular PID.
procps(3), procps_pids(3), getutent(3), sd_get_sessions(3),
proc(5).
This page is part of the procps-ng (/proc filesystem utilities)
project. Information about the project can be found at
⟨https://gitlab.com/procps-ng/procps⟩. If you have a bug report
for this manual page, see
⟨https://gitlab.com/procps-ng/procps/blob/master/Documentation/bugs.md⟩.
This page was obtained from the project's upstream Git repository
⟨https://gitlab.com/procps-ng/procps.git⟩ on 2024-06-14. (At
that time, the date of the most recent commit that was found in
the repository was 2024-06-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
libproc2 2024-06-04 PROCPS_MISC(3)
Pages that refer to this page: procps(3), procps_pids(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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