diff options
Diffstat (limited to 'shell_cmds/renice')
| -rw-r--r-- | shell_cmds/renice/renice.8 | 138 | ||||
| -rw-r--r-- | shell_cmds/renice/renice.c | 203 |
2 files changed, 341 insertions, 0 deletions
diff --git a/shell_cmds/renice/renice.8 b/shell_cmds/renice/renice.8 new file mode 100644 index 0000000..5a03755 --- /dev/null +++ b/shell_cmds/renice/renice.8 @@ -0,0 +1,138 @@ +.\" Copyright (c) 1983, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed by the University of +.\" California, Berkeley and its contributors. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)renice.8 8.1 (Berkeley) 6/9/93 +.\" $FreeBSD: src/usr.bin/renice/renice.8,v 1.16 2003/02/26 20:27:24 charnier Exp $ +.\" +.Dd June 9, 1993 +.Dt RENICE 8 +.Os +.Sh NAME +.Nm renice +.Nd alter priority of running processes +.Sh SYNOPSIS +.Nm +.Ar priority +.Op Oo Fl p Oc Ar pid ... +.Op Oo Fl g Oc Ar pgrp ... +.Op Oo Fl u Oc Ar user ... +.Nm +.Fl n Ar increment +.Op Oo Fl p Oc Ar pid ... +.Op Oo Fl g Oc Ar pgrp ... +.Op Oo Fl u Oc Ar user ... +.Sh DESCRIPTION +The +.Nm +utility alters the +scheduling priority of one or more running processes. +The following +.Ar who +parameters are interpreted as process ID's, process group +ID's, user ID's or user names. +The +.Nm Ns 'ing +of a process group causes all processes in the process group +to have their scheduling priority altered. +The +.Nm Ns 'ing +of a user causes all processes owned by the user to have +their scheduling priority altered. +By default, the processes to be affected are specified by +their process ID's. +.Pp +The following options are available: +.Bl -tag -width indent +.It Fl g +Force +.Ar who +parameters to be interpreted as process group ID's. +.It Fl n +Instead of changing the specified processes to the given priority, +interpret the following argument as an increment to be applied to +the current priority of each process. +.It Fl u +Force the +.Ar who +parameters to be interpreted as user names or user ID's. +.It Fl p +Reset the +.Ar who +interpretation to be (the default) process ID's. +.El +.Pp +For example, +.Pp +.Dl "renice +1 987 -u daemon root -p 32" +.Pp +would change the priority of process ID's 987 and 32, and +all processes owned by users daemon and root. +.Pp +Users other than the super-user may only alter the priority of +processes they own, +and can only monotonically increase their ``nice value'' +within the range 0 to +.Dv PRIO_MAX +(20). +(This prevents overriding administrative fiats.) +The super-user +may alter the priority of any process +and set the priority to any value in the range +.Dv PRIO_MIN +(\-20) +to +.Dv PRIO_MAX . +Useful priorities are: +20 (the affected processes will run at the lowest priority), +0 (the ``base'' scheduling priority), +anything negative (lower values cause more favorable scheduling). +.Sh FILES +.Bl -tag -width /etc/passwd -compact +.It Pa /etc/passwd +to map user names to user ID's +.El +.Sh SEE ALSO +.Xr nice 1 , +.Xr getpriority 2 , +.Xr setpriority 2 +.Sh STANDARDS +The +.Nm +utility conforms to +.St -p1003.1-2001 . +.Sh HISTORY +The +.Nm +utility appeared in +.Bx 4.0 . +.Sh BUGS +Non super-users cannot increase scheduling priorities of their own processes, +even if they were the ones that decreased the priorities in the first place. diff --git a/shell_cmds/renice/renice.c b/shell_cmds/renice/renice.c new file mode 100644 index 0000000..d7253e0 --- /dev/null +++ b/shell_cmds/renice/renice.c @@ -0,0 +1,203 @@ +/* + * Copyright (c) 1983, 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static const char copyright[] = +"@(#) Copyright (c) 1983, 1989, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#if 0 +#ifndef lint +static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93"; +#endif /* not lint */ +#endif + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/resource.h> + +#include <err.h> +#include <errno.h> +#include <limits.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +static int donice(int, int, int, int); +static int getnum(const char *, const char *, int *); +static void usage(void); + +/* + * Change the priority (nice) of processes + * or groups of processes which are already + * running. + */ +int +main(int argc, char *argv[]) +{ + struct passwd *pwd; + int errs, incr, prio, which, who; + int delim; + int priflag; + + errs = 0; + incr = 0; + which = PRIO_PROCESS; + who = 0; + argc--, argv++; + if (argc < 2) + usage(); + delim = 0; + priflag = 0; + + /* incrementing priflag here ensures we only process + the single priority arg if it is the very first arg */ + for (; argc > 0; argc--, argv++, priflag++) { + /* once we've seen -- , don't process anymore switches */ + if (0 == delim) { + /* -n must immediately be followed by the incremental + priority */ + if (strcmp(*argv, "-n") == 0) { + incr = 1; + argc--, argv++; + if (getnum("priority", *argv, &prio)) + return (1); + continue; + } + if (strcmp(*argv, "-g") == 0) { + which = PRIO_PGRP; + continue; + } + if (strcmp(*argv, "-u") == 0) { + which = PRIO_USER; + continue; + } + if (strcmp(*argv, "-p") == 0) { + which = PRIO_PROCESS; + continue; + } + if (strcmp(*argv, "--") == 0) { + delim = 1; + continue; + } + if (0 == priflag) { + /* if very first switch/arg and we've made it to + here, this must be the priority */ + if (getnum("priority", *argv, &prio)) { + return(1); + } + continue; + } + } + if (which == PRIO_USER) { + if ((pwd = getpwnam(*argv)) != NULL) + who = pwd->pw_uid; + else if (getnum("uid", *argv, &who)) { + errs++; + continue; + } else if (who < 0) { + warnx("%s: bad value", *argv); + errs++; + continue; + } + } else { + if (getnum("pid", *argv, &who)) { + errs++; + continue; + } + if (who < 0) { + warnx("%s: bad value", *argv); + errs++; + continue; + } + } + errs += donice(which, who, prio, incr); + } + exit(errs != 0); +} + +static int +donice(int which, int who, int prio, int incr) +{ + int oldprio; + + errno = 0; + oldprio = getpriority(which, who); + if (oldprio == -1 && errno) { + warn("%d: getpriority", who); + return (1); + } + if (incr) + prio = oldprio + prio; + if (prio > PRIO_MAX) + prio = PRIO_MAX; + if (prio < PRIO_MIN) + prio = PRIO_MIN; + if (setpriority(which, who, prio) < 0) { + warn("%d: setpriority", who); + return (1); + } + return (0); +} + +static int +getnum(const char *com, const char *str, int *val) +{ + long v; + char *ep; + + errno = 0; + v = strtol(str, &ep, 10); + if (v < INT_MIN || v > INT_MAX || errno == ERANGE) { + warnx("%s argument %s is out of range.", com, str); + return (1); + } + if (ep == str || *ep != '\0' || errno != 0) { + warnx("Bad %s argument: %s.", com, str); + return (1); + } + + *val = (int)v; + return (0); +} + +static void +usage() +{ + fprintf(stderr, "%s\n%s\n", +"usage: renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]", +" renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]"); + exit(1); +} |