Properly use .Nm, .Em, .Pa etc. Make usage() a simplier function.
This commit is contained in:
Philippe Charnier
parent
eb257e6ec5
commit
c097456602
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=58609
@ -57,7 +57,7 @@ environment variables like
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.Xr env 1
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and run a program with the selected resources.
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Three uses of the
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.Nm limits
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.Nm
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command are possible:
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.Pp
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.Bl -hang -width indent
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@ -99,9 +99,9 @@ format, suitable for the calling shell.
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The calling shell is determined by examining the entries in the
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.Pa /proc
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filesystem for the parent process.
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If the shell is known (ie. it is one of sh, csh, bash, tcsh, ksh,
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If the shell is known (i.e. it is one of sh, csh, bash, tcsh, ksh,
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pdksh or rc),
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.Nm limits
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.Nm
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emits 'limit' or 'ulimit' commands in the format understood by
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that shell.
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If the name of the shell cannot be determined, then the 'ulimit'
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@ -116,13 +116,13 @@ global configuration of maximum resource usage by maintaining a
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central database of settings in the login class database.
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.Pp
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Within a shell script,
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.Nm limits
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.Nm
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will normally be used with eval within backticks as follows:
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.Pp
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.Dl eval `limits -e -C daemon`
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.Pp
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which causes the output of
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.Nm limits
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.Nm
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to be evaluated and set by the current shell.
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.El
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.Pp
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@ -140,7 +140,7 @@ If the user does not belong to a class, then the resource capabilities
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for the "default" class are used, if it exists, or the "root" class if
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the user is a superuser account.
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.It Fl S
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Selects display or setting of "soft" (or current) resource limits.
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Select display or setting of "soft" (or current) resource limits.
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If specific limits settings follow this switch, only soft limits are
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affected unless overridden later with either the
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.Fl H
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@ -148,7 +148,7 @@ or
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.Fl B
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flags.
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.It Fl H
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Selects display or setting of "hard" (or maximum) resource limits.
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Select display or setting of "hard" (or maximum) resource limits.
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If specific limits settings follow this switch, only hard limits are
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affected until overridden later with either the
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.Fl S
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@ -156,7 +156,7 @@ or
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.Fl B
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flags.
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.It Fl B
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Selects display or setting of both "soft" (current) or "hard" (maximum)
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Select display or setting of both "soft" (current) or "hard" (maximum)
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resource limits.
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If specific limits settings follow this switch, both soft and hard
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limits are affected until overridden later with either the
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@ -165,40 +165,40 @@ or
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.Fl H
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flags.
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.Fl e
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Selects "eval mode" formatting for output.
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Select "eval mode" formatting for output.
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This is valid only on display mode and cannot be used when running a
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command.
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The exact syntax used for output depends upon the type of shell from
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which
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.Nm limits
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.Nm
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is invoked.
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.It Fl b Op Ar limit
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Selects or sets the
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.Em sbsize
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resource limit.
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.It Fl c Op Ar limit
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Selects or sets (if 'limit' is specified) the
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Select or set (if 'limit' is specified) the
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.Em coredumpsize
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resource limit.
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A value of 0 disables core dumps.
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.It Fl d Op Ar limit
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Selects or sets (if 'limit' is specified) the
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Select or set (if 'limit' is specified) the
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.Em datasize
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resource limit.
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.It Fl f Op Ar limit
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Selects or sets the
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Select or set the
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.Em filesize
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resource limit.
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.It Fl l Op Ar limit
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Selects or sets the
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Select or set the
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.Em memorylocked
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resource limit.
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.It Fl m Op Ar limit
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Selects or sets the
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Select or set the
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.Em memoryuse
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size limit.
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.It Fl n Op Ar limit
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Selects or sets the
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Select or set the
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.Em openfiles
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resource limit. The system-wide limit on the maximum number of
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open files per process can be viewed using the 'sysctl kern.maxfilesperproc'
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@ -206,15 +206,15 @@ command. The total number of simultaneously open files in the entire
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system is limited to the value displayed by the 'sysctl kern.maxfiles'
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command.
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.It Fl s Op Ar limit
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Selects or sets the
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Select or set the
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.Em stacksize
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resource limit.
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.It Fl t Op Ar limit
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Selects or sets the
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Select or set the
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.Em cputime
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resource limit.
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.It Fl u Op Ar limit
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Selects or sets the
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Select or set the
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.Em maxproc
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resource limit. The system-wide limit on the maximum number of processes
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allowed per UID can be viewed using the 'sysctl kern.maxprocperuid' command.
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@ -222,8 +222,16 @@ The maximum number of processes that can be running simultaneously
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in the entire system is limited to the value given by
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the 'sysctl kern.maxproc' command.
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.Pp
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Valid values for 'limit' in the above set of flags consist of either the
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string 'infinity' or 'inf' for an infinite (or kernel-defined maximum)
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Valid values for
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.Ar limit
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in the above set of flags consist of either the
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string
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.Em infinity ,
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.Em inf ,
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.Em unlimited
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or
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.Em unlimit
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for an infinite (or kernel-defined maximum)
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limit, or a numeric value maybe followed by a suffix.
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Values which relate to size default to a value in bytes, or one of the
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following suffixes may be used as a multiplier:
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@ -265,7 +273,7 @@ weeks.
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The option
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.Sq Fl E
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causes
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.Nm limits
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.Nm
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to completely ignore the environment it inherits.
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.It Fl a
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This option forces all resource settings to be displayed even if
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@ -282,17 +290,17 @@ call, only the superuser may raise process "hard" resource limits.
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Non-root users may, however, lower them or change "soft" resource limits
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within to any value below the hard limit.
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When invoked to execute a program, the failure of
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.Nm limits
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.Nm
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to raise a hard limit is considered a fatal error.
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.El
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.Sh DIAGNOSTICS
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.Nm Limits
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exits with EXIT_FAILURE if usage is incorrect in any way; ie. an invalid
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exits with EXIT_FAILURE if usage is incorrect in any way; i.e. an invalid
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option, or set/display options are selected in the same invocation,
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.Fl e
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is used when running a program, etc.
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When run in display or eval mode,
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.Nm limits
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.Nm
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exits with a status of EXIT_SUCCESS.
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When run in command mode and execution of the command succeeds, the exit status
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will be whatever the executed program returns.
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@ -311,18 +319,26 @@ will be whatever the executed program returns.
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does not handle commands with equal (``='') signs in their
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names, for obvious reasons.
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.Pp
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When eval output is selected, the /proc filesystem must be installed
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When eval output is selected, the
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.Pa /proc
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filesystem must be installed
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and mounted for the shell to be correctly determined, and therefore
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output syntax correct for the running shell.
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The default output is valid for /bin/sh, so this means that any
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The default output is valid for
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.Pa /bin/sh ,
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so this means that any
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usage of
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.Nm limits
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in eval mode prior mounting /proc may only occur in standard bourne
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.Nm
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in eval mode prior mounting
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.Pa /proc
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may only occur in standard bourne
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shell scripts.
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.Pp
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.Nm Limits
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makes no effort to ensure that resource settings emitted or displayed
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are valid and settable by the current user.
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Only a superuser account may raise hard limits, and when doing so
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the FreeBSD kernel will silently lower limits to values less than
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the
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.Fx
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kernel will silently lower limits to values less than
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specified if the values given are too high.
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@ -214,7 +214,7 @@ static struct {
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#define RCS_STRING "tfdscmlunb"
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static rlim_t resource_num(int which, int ch, const char *str);
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static void usage(const char *msg, ...);
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static void usage(void);
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static int getshelltype(void);
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static void print_limit(rlim_t limit, unsigned divisor, const char *inf,
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const char *pfx, const char *sfx, const char *which);
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@ -266,7 +266,8 @@ main(int argc, char *argv[])
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if ((pwd = getpwnam(optarg)) == NULL) {
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if (!isdigit(*optarg) ||
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(pwd = getpwuid(atoi(optarg))) == NULL) {
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usage("Invalid user `%s'\n", optarg);
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warnx("invalid user `%s'", optarg);
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usage();
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}
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}
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break;
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@ -297,7 +298,7 @@ main(int argc, char *argv[])
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}
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/* FALLTHRU */
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case '?':
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usage(NULL);
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usage();
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}
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optarg = NULL;
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}
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@ -377,8 +378,10 @@ main(int argc, char *argv[])
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* (perhaps) set environment variables and run a program
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*/
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if (*argv) {
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if (doeval)
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usage("-e cannot be used with `cmd' option\n");
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if (doeval) {
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warnx("-e cannot be used with `cmd' option");
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usage();
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}
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login_close(lc);
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@ -394,7 +397,7 @@ main(int argc, char *argv[])
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}
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if (*argv == NULL)
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usage(NULL);
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usage();
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execvp(*argv, argv);
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err(1, "%s", *argv);
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@ -450,14 +453,8 @@ main(int argc, char *argv[])
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static void
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usage(char const *msg, ...)
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usage(void)
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{
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if (msg) {
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va_list argp;
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va_start(argp, msg);
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vfprintf(stderr, msg, argp);
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va_end(argp);
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}
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(void)fprintf(stderr,
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"usage: limits [-C class|-U user] [-eaSHBE] [-bcdflmnstu [val]] [[name=val ...] cmd]\n");
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exit(EXIT_FAILURE);
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@ -567,8 +564,10 @@ resource_num(int which, int ch, const char *str)
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s = e;
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break;
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}
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if (*s)
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usage("invalid value -%c `%s'\n", ch, str);
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if (*s) {
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warnx("invalid value -%c `%s'", ch, str);
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usage();
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}
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}
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return res;
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}
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