166 lines
4.9 KiB
Groff
166 lines
4.9 KiB
Groff
.\" (C) Copyright 2020 Craig Small <csmall@dropbear.xyz>
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.\" (C) Copyright 2021-2022 Jim Warner <james.warner@comcast.net>
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.\"
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.\" %%%LICENSE_START(LGPL_2.1+)
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.\" This manual 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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.\"
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.\" This manual 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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.\"
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.\" You should have received a copy of the GNU Lesser General Public
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.\" License along with this library; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\" %%%LICENSE_END
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.\"
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.TH PROCPS_MISC 3 "July 2022" "libproc-2"
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.\" Please adjust this date whenever revising the manpage.
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.\"
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.nh
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.SH NAME
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procps_misc \- API for miscellaneous information in the /proc filesystem
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.SH SYNOPSIS
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.nf
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.B #include <procps/misc.h>
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.PP
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Platform Particulars
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.RS 4
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.PP
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.RB "long " procps_cpu_count " (void);
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.RB "long " procps_hertz_get " (void);
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.RB "unsigned int " procps_pid_length " (void);
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.RB "int " procps_linux_version " (void);
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.RE
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.PP
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Runtime Particulars
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.PP
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.RS 4
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.RI "int \fB procps_loadavg\fR (double *" av1 ", double *" av5 ", double *" av15 ");"
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.RI "int \fB procps_uptime\fR (double *" uptime_secs ", double *" idle_secs ");"
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.RB "char *" procps_uptime_sprint " (void);"
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.RB "char *" procps_uptime_sprint_short " (void);"
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.RE
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.PP
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Namespace Particulars
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.PP
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.RS 4
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.RI "int \fB procps_ns_get_id\fR (const char *" name ");"
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.RI "const char\fB *procps_ns_get_name\fR (int " id ");"
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.RI "int \fB procps_ns_read_pid\fR (int " pid ", struct procps_ns *" nsp ");"
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.RE
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Link with \fI\-lproc-2\fP.
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.SH DESCRIPTION
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.BR procps_cpu_count ()
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returns the number of CPUs that are currently online as
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.BI sysconf( _SC_NPROCESSORS_ONLY )
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or an assumed \fI1\fR.
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.BR procps_hertz_get ()
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returns the number of clock ticks per second as
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.BI sysconf( _SC_CLK_TCK )
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or an assumed \fI100\fR.
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Dividing tics by this value yields seconds.
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.BR procps_pid_length ()
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returns the maximum string length for a PID on the system. For example, if the largest
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possible PID value on was 123, then the length would be 3. If the file
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\fI/proc/sys/kernel/pid_max\fR is unreadable, the value is assumed to be \fI5\fR.
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.BR procps_linux_version ()
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returns the current Linux version as an encoded integer. On non-Linux systems that
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have an emulated proc filesystem this function returns the version of the
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Linux emulation instead.
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The version consists of three positive integers representing the major,
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minor and patch levels.
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The following macros are provided for encoding a given Linux version or
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separating out the components of the current version.
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.RS 4
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.PP
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LINUX_VERSION(\ major\ ,\ minor\ ,\ patch\ )
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.PP
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LINUX_VERSION_MAJOR(\ ver\ )
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.PP
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LINUX_VERSION_MINOR(\ ver\ )
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.PP
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LINUX_VERSION_PATCH(\ ver\ )
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.RE
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.BR procps_loadavg ()
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fetches the system load average and puts the 1, 5 and 15 minute averages into
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location(s) specified by any pointer which is not \fINULL\fR.
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.BR procps_uptime ()
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returns uptime and/or idle seconds into location(s) specified by any pointer
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which is not \fINULL\fR.
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The \fBsprint\fR varieties return a human-readable string in one of two forms.
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.RS 4
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.PP
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HH:MM:SS up HH:MM, # users, load average: 1, 5, 15 MM averages
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.PP
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up HH, MM
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.RE
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.BR procps_ns_get_id ()
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returns the integer id (enum namespace_type) of the namespace for the given namespace \fIname\fR.
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.BR procps_ns_get_name ()
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returns the name of the namespace for the given \fIid\fR (enum namespace_type).
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.BR procps_ns_read_pid ()
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returns the inodes for the namespaces of the given process in the
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procps_ns structure pointed to by \fInsp\fR.
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Those inodes will appear in the order proscribed by enum namespace_type.
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.PP
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.RS 4
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.nf
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enum namespace_type {
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PROCPS_NS_CGROUP,
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PROCPS_NS_IPC,
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PROCPS_NS_MNT,
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PROCPS_NS_NET,
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PROCPS_NS_PID,
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PROCPS_NS_TIME,
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PROCPS_NS_USER,
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PROCPS_NS_UTS
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};
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.fi
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.RE
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.SH RETURN VALUE
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.SS Functions Returning an `int' or `long'
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An error will be indicated by a negative number that
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is always the inverse of some well known errno.h value.
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.SS Functions Returning an `address'
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An error will be indicated by a NULL return pointer
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with the reason found in the formal errno value.
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.SH FILES
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.TP
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.I /proc/loadavg
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The raw values for load average.
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.TP
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.I /proc/sys/kernel/osrelease
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Contains the release version of the Linux kernel or proc filesystem.
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.TP
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.I /proc/sys/kernel/pid_max
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Contains the value at which PIDs wrap around, one greater than the maximum PID value.
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.TP
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.I /proc/uptime
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The raw values for uptime and idle time.
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.TP
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.IB /proc/<PID>/ns
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contains the set of namespaces for a particular \fBPID\fR.
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.SH SEE ALSO
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.BR procps (3),
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.BR procps_pids (3),
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.BR proc (5).
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