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nice(1) [opensolaris man page]

nice(1) 							   User Commands							   nice(1)

NAME
nice - invoke a command with an altered scheduling priority SYNOPSIS
/usr/bin/nice [-increment | -n increment] command [argument]... /usr/xpg4/bin/nice [-increment | -n increment] command [argument]... csh Builtin nice [-increment | +increment] [command] DESCRIPTION
The nice utility invokes command, requesting that it be run with a different system scheduling priority. The priocntl(1) command is a more general interface to scheduler functions. The invoking process (generally the user's shell) must be in a scheduling class that supports nice. If the C shell (see csh(1)) is used, the full path of the command must be specified. Otherwise, the csh built-in version of nice will be invoked. See csh Builtin below. /usr/bin/nice If nice executes commands with arguments, it uses the default shell /usr/bin/sh (see sh(1)). /usr/xpg4/bin/nice If nice executes commands with arguments, it uses /usr/xpg4/bin/sh (see ksh(1)). csh Builtin nice is also a csh built-in command with behavior different from the utility versions. See csh(1) for description. OPTIONS
The following options are supported: -increment | -n increment increment is a positive or negative decimal integer that has the same effect on the execution of the utility as if the utility had called the nice() function with the numeric value of the increment option-argument. See nice(2). nice() errors, other than EINVAL, are ignored. If not specified, an increment of 10 is assumed. The super-user may run commands with priority higher than normal by using a negative increment such as -10. A negative increment assigned by an unprivileged user is ignored. OPERANDS
The following operands are supported: command The name of a command that is to be invoked. If command names any of the special built-in utilities (see shell_builtins(1)), the results are undefined. argument Any string to be supplied as an argument when invoking command. ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of nice: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, PATH, and NLSPATH. EXIT STATUS
If command is invoked, the exit status of nice will be the exit status of command. Otherwise, nice will exit with one of the following val- ues: 1-125 An error occurred. 126 command was found but could not be invoked. 127 command could not be found. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin/nice +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ /usr/xpg4/bin/nice +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWxcu4 | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), ksh(1), nohup(1), priocntl(1), sh(1), shell_builtins(1), nice(2), attributes(5), environ(5), standards(5) SunOS 5.11 23 Jan 2004 nice(1)

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nice(2) 							   System Calls 							   nice(2)

NAME
nice - change priority of a process SYNOPSIS
#include <unistd.h> int nice(int incr); DESCRIPTION
The nice() function allows a process to change its priority. The invoking process must be in a scheduling class that supports the nice(). The nice() function adds the value of incr to the nice value of the calling process. A process's nice value is a non-negative number for which a greater positive value results in lower CPU priority. A maximum nice value of (2 * NZERO) -1 and a minimum nice value of 0 are imposed by the system. NZERO is defined in <limits.h> with a default value of 20. Requests for values above or below these limits result in the nice value being set to the corresponding limit. A nice value of 40 is treated as 39. Calling the nice() function has no effect on the priority of processes or threads with policy SCHED_FIFO or SCHED_RR. Only a process with the {PRIV_PROC_PRIOCNTL} privilege can lower the nice value. RETURN VALUES
Upon successful completion, nice() returns the new nice value minus NZERO. Otherwise, -1 is returned, the process's nice value is not changed, and errno is set to indicate the error. ERRORS
The nice() function will fail if: EINVAL The nice() function is called by a process in a scheduling class other than time-sharing or fixed-priority. EPERM The incr argument is negative or greater than 40 and the {PRIV_PROC_PRIOCNTL} privilege is not asserted in the effective set of the calling process. USAGE
The priocntl(2) function is a more general interface to scheduler functions. Since -1 is a permissible return value in a successful situation, an application wishing to check for error situations should set errno to 0, then call nice(), and if it returns -1, check to see if errno is non-zero. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Async-Signal-Safe | +-----------------------------+-----------------------------+ SEE ALSO
nice(1), exec(2), priocntl(2), getpriority(3C), attributes(5), privileges(5), standards(5) SunOS 5.10 1 Apr 2004 nice(2)
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