Process

unix:getpid [function]

returns the process id (16bit integer) of this process.

unix:getppid [function]

returns the process id of the parent process.

unix:getpgrp integer [function]

returns the process group id.

unix:setpgrp integer [function]

sets a new process group id.

unix:getuid [function]

gets user id of this process.

unix:geteuid [function]

returns the effective user id of this process.

unix:getgid [function]

returns the group id of this process.

unix:getegid [function]

returns the effective group id of this process.

unix:setuid integer [function]

sets effective user id of this process.

unix:setgid integer [function]

sets the effective group id of this process.

unix:fork [function]

creates another EusLisp. 0 is returned to the subprocess and the pid of the forked process is returned to the parent process. Use system:piped-fork described in section 13.3 to make a process connected via pipes.

unix:vfork [function]

forks another EusLisp, and suspends the parent process from execution until the new EusLisp process terminates.

unix:exec path [function]

replaces executing EusLisp with another program.

unix:wait [function]

waits for the completion of one of subprocesses.

unix:exit code [function]

terminates execution and returns code as its completion status. Zero means normal termination.

sys:*exit-hook* [variable]

Defines a function that is called just before the process is exited.

unix:getpriority which who [function]

returns the highest priority (nice value) enjoyed by this process. Which is one of 0(process), 1(process-group) or 2(user).

unix:setpriority which who priority [function]

sets priority of the resource determined by which and who. which is one of 0(process), 1(process-group) or 2(user). who is interpreted relative to which (a process identifier for $which=0$, process group identifier for $which=1$, and a user ID for $which=2$. A zero value of who denotes the current process, process group, or user. To lower the priority (nice value) of your EusLisp process, (unix:setpriority 0 0 10) will sets the nice value to 10. Bigger nice value makes your process get less favored.

unix:getrusage who [function]

returns list of system resource usage information about who process. Elements are ordered as follows: More comprehensive display is obtained by lisp:rusage.

    float ru_utime (sec.) /* user time used */
    float ru_stime (sec.) /* system time used */
    int  ru_maxrss;       /* maximum resident set size */
    int  ru_ixrss;        /* currently 0 */
    int  ru_idrss;        /* integral resident set size */
    int  ru_isrss;        /* currently 0 */
    int  ru_minflt;       /* page faults without physical I/O */
    int  ru_majflt;       /* page faults with physical I/O */
    int  ru_nswap;        /* number of swaps */
    int  ru_inblock;      /* block input operations */
    int  ru_oublock;      /* block output operations */
    int  ru_msgsnd;       /* messages sent */
    int  ru_msgrcv;       /* messages received */
    int  ru_nsignals;     /* signals received */
    int  ru_nvcsw;        /* voluntary context switches */
    int  ru_nivcsw;       /* involuntary context switches */

unix:system [command] [function]

executes command in a sub shell. command must be recognizable by Bourn-shell.

unix:getenv env-var [function]

gets the value for the environment variable env-var.

unix:putenv env [function]

adds env in the process's environment variable list. env is a string which equates var to value like "VARIABLE=value".

unix:sleep time [function]

suspends execution of this process for time seconds.

unix:usleep time [function]

suspends execution of this process for time micro-seconds (u represents micro). Usleep is not available on Solaris2 or other Sys5 based systems.