Jarayon va uning holatlari

#include <stdio.h>
#include <stdlib.h>

int global_qiymatli = 42;      /* data */
int global_nol;                /* bss */

int main(void) {
    int mahalliy = 7;                  /* stek */
    int *uyumda = malloc(sizeof(int)); /* uyum */

    if (uyumda == NULL) {
        return 1;
    }

    *uyumda = 100;

    printf("Kod (main)     : %s\n", (void *) main != NULL ? "bor" : "yo'q");
    printf("Global (data)  : %d\n", global_qiymatli);
    printf("Global (bss)   : %d\n", global_nol);
    printf("Stek           : %d\n", mahalliy);
    printf("Uyum           : %d\n", *uyumda);

    /* manzillar tartibini tekshiramiz */
    printf("Uyum stekdan pastdami? : %s\n",
           (void *) uyumda < (void *) &mahalliy ? "ha" : "yo'q");

    free(uyumda);
    return 0;
}

ps aux | head -5

USER  PID %CPU %MEM    VSZ   RSS TTY  STAT START   TIME COMMAND
root    1  0.0  0.1 168404 11928 ?    Ss   09:12   0:02 /sbin/init
root    2  0.0  0.0      0     0 ?    S    09:12   0:00 [kthreadd]
husan 842  1.2  2.4 985432 39812 ?    Sl   09:15   0:45 /usr/bin/firefox
husan 901  0.0  0.0  12456  3204 pts/0 R+  10:22   0:00 ps aux

#include <stdio.h>
#include <unistd.h>

int main(void) {
    pid_t ozim = getpid();
    pid_t otam = getppid();

    printf("Mening PID     : %s\n", ozim > 0 ? "olindi" : "xato");
    printf("Otamning PID   : %s\n", otam > 0 ? "olindi" : "xato");
    printf("PID musbat son : %s\n", ozim > 0 ? "ha" : "yo'q");

    /* aniq raqamlarni ko'rish uchun: */
    /* printf("PID = %d, PPID = %d\n", ozim, otam); */

    return 0;
}

pstree -p | head -12

systemd(1)─┬─ModemManager(892)─┬─{ModemManager}(915)
           │                   └─{ModemManager}(921)
           ├─NetworkManager(878)───{NetworkManager}(902)
           ├─bash(1204)───pstree(1567)
           ├─cron(864)
           ├─sshd(901)───sshd(1198)───bash(1204)
           └─systemd-journal(312)

ls /proc/self/

cmdline  cwd  environ  exe  fd  limits  maps  root  stat  status  task

cat /proc/self/status | head -8

Name:    cat
Umask:    0022
State:    R (running)
Tgid:    2451
Ngid:    0
Pid:    2451
PPid:    1204
TracerPid:    0

vmstat 1 3

procs -----------memory---------- ---system-- ------cpu-----
 r  b   swpd   free   buff  cache   in     cs us sy id wa st
 2  0      0 6823456 234560 4512332 1245  3421  3  1 96  0  0
 1  0      0 6823012 234560 4512332 1102  2987  2  1 97  0  0
 0  0      0 6822980 234560 4512332  987  2654  1  1 98  0  0

top -b -n 1 | head -12

top - 10:45:32 up 2 days,  3:12,  2 users,  load average: 0.42, 0.38, 0.35
Tasks: 312 total,   1 running, 311 sleeping,   0 stopped,   0 zombie
%Cpu(s):  2.1 us,  0.8 sy,  0.0 ni, 97.0 id,  0.1 wa,  0.0 hi,  0.0 si
MiB Mem :  15903.4 total,   6823.1 free,   4212.5 used,   4867.8 buff/cache

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
  842 husanboy  20   0  985432 398124 145232 S   1.2   2.4   0:45.23 firefox
 1204 husanboy  20   0   12456   5204   3412 S   0.0   0.0   0:00.12 bash

kill 1234          # muloyim so'rov: tugating (SIGTERM)
kill -9 1234       # majburiy to'xtatish (SIGKILL)
kill -STOP 1234    # muzlatish
kill -CONT 1234    # davom ettirish

pkill firefox      # nom bo'yicha
killall firefox    # barcha nusxalarini