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v4.0.0
doc/procps_misc.3
163 строки
5 KB
Jim Warner
doc: minor tweaks affecting three newlib man documents
27 фев 2022, 13:27
27 фев 2022, 13:27
854e85a
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.\" (C) Copyright 2020 Craig Small <csmall@dropbear.xyz> .\" (C) Copyright 2021-2022 Jim Warner <james.warner@comcast.net> .\" .\" %%%LICENSE_START(LGPL_2.1+) .\" This manual 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. .\" .\" This manual 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 this library; if not, write to the Free Software .\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA .\" %%%LICENSE_END .\" .TH PROCPS_MISC 3 "January 2022" "libproc-2" .\" Please adjust this date whenever revising the manpage. .\" .nh .SH NAME procps_misc \- API for miscellaneous information in the /proc filesystem .SH SYNOPSIS .nf .B #include <procps/misc.h> .PP Platform Particulars .RS 4 .PP .B "long procps_cpu_count (void);" .B "long procps_hertz_get (void);" .B "unsigned int procps_pid_length (void);" .B "int procps_linux_version (void);" .RE .PP Runtime Particulars .PP .RS 4 .BI "int procps_loadavg (double * " av1 ", double * " av5 ", double * " av15 ");" .BI "int procps_uptime (double * " uptime_secs ", double * " idle_secs ");" .B "char * procps_uptime_sprint (void);" .B "char * procps_uptime_sprint_short (void);" .RE .PP Namespace Particulars .PP .RS 4 .BI "int procps_ns_get_id (const char * " name ");" .BI "const char * procps_ns_get_name (int " id ");" .BI "int procps_ns_read_pid (int " pid ", struct procps_ns * " nsp ");" .RE Link with \fI\-lproc-2\fP. .SH DESCRIPTION .BR procps_cpu_count () returns the number of CPUs that are currently online as .BI sysconf( _SC_NPROCESSORS_ONLY ) or an assumed \fI1\fR. .BR procps_hertz_get () returns the number of clock ticks per second as .BI sysconf( _SC_CLK_TCK ) or an assumed \fI100\fR. Dividing tics by this value yields seconds. .BR 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 \fI/proc/sys/kernel/pid_max\fR is unreadable, the value is assumed to be \fI5\fR. .BR 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. .RS 4 .PP LINUX_VERSION(\ major\ ,\ minor\ ,\ patch\ ) .PP LINUX_VERSION_MAJOR(\ ver\ ) .PP LINUX_VERSION_MINOR(\ ver\ ) .PP LINUX_VERSION_PATCH(\ ver\ ) .RE .BR 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 \fINULL\fR. .BR procps_uptime () returns uptime and/or idle seconds into location(s) specified by any pointer which is not \fINULL\fR. The \fBsprint\fR varieties return a human-readable string in one of two forms. .RS 4 .PP HH:MM:SS up HH:MM, # users, load average: 1, 5, 15 MM averages .PP up HH, MM .RE .BR procps_ns_get_id () returns the integer id (enum namespace_type) of the namespace for the given namespace \fIname\fR. .BR procps_ns_get_name () returns the name of the namespace for the given \fIid\fR (enum namespace_type). .BR procps_ns_read_pid () returns the inodes for the namespaces of the given process in the procps_ns structure pointed to by \fInsp\fR. Those inodes will appear in the order proscribed by enum namespace_type. .PP .RS 4 .nf enum namespace_type { PROCPS_NS_IPC, PROCPS_NS_MNT, PROCPS_NS_NET, PROCPS_NS_PID, PROCPS_NS_USER, PROCPS_NS_UTS }; .fi .RE .SH RETURN VALUE .SS 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. .SS Functions Returning an `address' An error will be indicated by a NULL return pointer with the reason found in the formal errno value. .SH FILES .TP .I /proc/loadavg The raw values for load average. .TP .I /proc/sys/kernel/osrelease Contains the release version of the Linux kernel or proc filesystem. .TP .I /proc/sys/kernel/pid_max Contains the value at which PIDs wrap around, one greater than the maximum PID value. .TP .I /proc/uptime The raw values for uptime and idle time. .TP .IB /proc/<PID>/ns contains the set of namespaces for a particular \fBPID\fR. .SH SEE ALSO .BR procps (3), .BR procps_pids (3), .BR proc (5).