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diff --git a/man/procps_misc.3 b/man/procps_misc.3 new file mode 100644 index 0000000..bc42aac --- /dev/null +++ b/man/procps_misc.3 @@ -0,0 +1,156 @@ +.\" +.\" Copyright (c) 2020-2023 Jim Warner <james.warner@comcast.net> +.\" Copyright (c) 2020-2023 Craig Small <csmall@dropbear.xyz> +.\" +.\" 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. +.\" +.\" +.TH PROCPS_MISC 3 "August 2022" "libproc2" +.\" 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 <libproc2/misc.h> +.PP +Platform Particulars +.RS 4 +.PP +.RB "long " procps_cpu_count " (void); +.RB "long " procps_hertz_get " (void); +.RB "unsigned int " procps_pid_length " (void); +.RB "int " procps_linux_version " (void); +.RE +.PP +Runtime Particulars +.PP +.RS 4 +.RI "int \fB procps_loadavg\fR (double *" av1 ", double *" av5 ", double *" av15 ");" +.RI "int \fB procps_uptime\fR (double *" uptime_secs ", double *" idle_secs ");" +.RB "char *" procps_uptime_sprint " (void);" +.RB "char *" procps_uptime_sprint_short " (void);" +.RE +.PP +Namespace Particulars +.PP +.RS 4 +.RI "int \fB procps_ns_get_id\fR (const char *" name ");" +.RI "const char\fB *procps_ns_get_name\fR (int " id ");" +.RI "int \fB procps_ns_read_pid\fR (int " pid ", struct procps_ns *" nsp ");" +.RE + +Link with \fI\-lproc2\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_CGROUP, + PROCPS_NS_IPC, + PROCPS_NS_MNT, + PROCPS_NS_NET, + PROCPS_NS_PID, + PROCPS_NS_TIME, + 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). |