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author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 12:33:43 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-27 12:33:43 +0000 |
commit | f9ab90d9d6d02989a075d0f0074496d5b1045e4b (patch) | |
tree | add7e996bac5289cdc55e6935750c352505560a9 /usr.bin/nice | |
parent | be22b15ae2ff8d7fe06b6e14fddf0c5b444a95da (diff) | |
download | FreeBSD-src-f9ab90d9d6d02989a075d0f0074496d5b1045e4b.zip FreeBSD-src-f9ab90d9d6d02989a075d0f0074496d5b1045e4b.tar.gz |
BSD 4.4 Lite Usr.bin Sources
Diffstat (limited to 'usr.bin/nice')
-rw-r--r-- | usr.bin/nice/Makefile | 5 | ||||
-rw-r--r-- | usr.bin/nice/nice.1 | 97 | ||||
-rw-r--r-- | usr.bin/nice/nice.c | 93 |
3 files changed, 195 insertions, 0 deletions
diff --git a/usr.bin/nice/Makefile b/usr.bin/nice/Makefile new file mode 100644 index 0000000..d36378e --- /dev/null +++ b/usr.bin/nice/Makefile @@ -0,0 +1,5 @@ +# @(#)Makefile 8.1 (Berkeley) 6/6/93 + +PROG= nice + +.include <bsd.prog.mk> diff --git a/usr.bin/nice/nice.1 b/usr.bin/nice/nice.1 new file mode 100644 index 0000000..67b8471 --- /dev/null +++ b/usr.bin/nice/nice.1 @@ -0,0 +1,97 @@ +.\" Copyright (c) 1980, 1990, 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. +.\" +.\" @(#)nice.1 8.1 (Berkeley) 6/6/93 +.\" +.Dd June 6, 1993 +.Dt NICE 1 +.Os BSD 4 +.Sh NAME +.Nm nice +.Nd execute a command at a low scheduling priority +.Sh SYNOPSIS +.Nm nice +.Op Fl Ns Ar number +.Ar command +.Op Ar arguments +.Sh DESCRIPTION +.Nm Nice +runs +.Ar command +at a low priority. +(Think of low and slow). +If +.Fl Ns Ar number +is specified, and if it is greater than or equal +to 10 (the default), +.Nm nice +will execute +.Ar command +at that priority. +The upper bound, or lowest priority that +.Nm nice +will run a command is 20. +The lower bounds or +higher priorities (integers less than 10) +can only be requested by the super-user. +Negative numbers are expressed as +.Fl - Ns Ar number . +.Pp +The returned exit status is the exit value from the +command executed by +.Nm nice . +.Sh SEE ALSO +.Xr csh 1 , +.Xr renice 8 +.Sh HISTORY +A +.Nm nice +command appeared in +.At v6 . +.Sh BUGS +.Nm Nice +is particular to +.Xr sh 1 . +If you use +.Xr csh 1 , +then commands executed with ``&'' are automatically immune to hangup +signals while in the background. +.Pp +.Nm Nice +is built into +.Xr csh 1 +with a slightly different syntax than described here. The form +.Ql nice +10 +nices to positive nice, and +.Ql nice \-10 +can be used +by the super-user to give a process more of the processor. diff --git a/usr.bin/nice/nice.c b/usr.bin/nice/nice.c new file mode 100644 index 0000000..6b905d9 --- /dev/null +++ b/usr.bin/nice/nice.c @@ -0,0 +1,93 @@ +/* + * Copyright (c) 1989, 1993, 1994 + * 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 char copyright[] = +"@(#) Copyright (c) 1989, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)nice.c 8.2 (Berkeley) 4/16/94"; +#endif /* not lint */ + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/resource.h> + +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> + +#define DEFNICE 10 + +void usage __P((void)); + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int niceness = DEFNICE; + + if (argv[1][0] == '-') + if (argv[1][1] == '-' || isdigit(argv[1][1])) { + niceness = atoi(argv[1] + 1); + ++argv; + } else + errx(1, "illegal option -- %s", argv[1]); + + if (argv[1] == NULL) + usage(); + + errno = 0; + niceness += getpriority(PRIO_PROCESS, 0); + if (errno) + err(1, "getpriority"); + if (setpriority(PRIO_PROCESS, 0, niceness)) + err(1, "setpriority"); + execvp(argv[1], &argv[1]); + err(1, "%s", argv[1]); +} + +void +usage() +{ + (void)fprintf(stderr, + "nice [ -# ] command [ options ] [ operands ]\n"); + exit(1); +} |