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 11.3 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.

  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.