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  1. #include <sys/types.h>
  2. #include <unistd.h>
  3. #include <stdio.h>
  4.  
  5. int main (int argc, char *argv[]) {
  6.     pid_t pid1, pid2;
  7.     int status1, status2;
  8.  
  9.     if ( (pid1 = fork()) == 0 ) {
  10.         // First child
  11.         printf("I am the first child (%d, child of %d)\n", getpid(), getppid());
  12.         printf("Executing 'ls' with execl...\n");
  13.         execl("/bin/ls", "ls", "-l", NULL);
  14.         // If execl fails, print an error
  15.         perror("execl failed");
  16.     } 
  17.     else {
  18.         // Parent process
  19.         if ( (pid2 = fork()) == 0 ) {
  20.             // Second child
  21.             printf("I am the second child (%d, child of %d)\n", getpid(), getppid());
  22.             printf("Executing 'ps' with execv...\n");
  23.             char *args[] = {"ps", "-A", NULL};
  24.             execv("/bin/ps", args);
  25.             // If execv fails, print an error
  26.             perror("execv failed");
  27.         } 
  28.         else {
  29.             // Parent waits for both children to finish
  30.             waitpid(pid1, &status1, 0);
  31.             waitpid(pid2, &status2, 0);
  32.             printf("Both children have finished executing.\n");
  33.         }
  34.     }
  35.  
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0.02s 5276KB
comments (?)
stdin
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Standard input is empty
stdout
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total 16
-rwxr-xr-x 1 root root 14312 Sep 25 21:18 prog
    PID TTY          TIME CMD
      1 ?        02:50:49 systemd
      2 ?        00:00:08 kthreadd
      3 ?        00:00:00 rcu_gp
      4 ?        00:00:00 rcu_par_gp
      5 ?        00:00:00 slub_flushwq
      6 ?        00:00:00 netns
      8 ?        00:00:00 kworker/0:0H-events_highpri
     10 ?        00:00:00 mm_percpu_wq
     11 ?        00:00:00 rcu_tasks_kthread
     12 ?        00:00:00 rcu_tasks_rude_kthread
     13 ?        00:00:00 rcu_tasks_trace_kthread
     14 ?        00:14:04 ksoftirqd/0
     15 ?        02:36:49 rcu_preempt
     16 ?        00:00:18 migration/0
     18 ?        00:00:00 cpuhp/0
     19 ?        00:00:00 cpuhp/1
     20 ?        00:00:23 migration/1
     21 ?        00:08:36 ksoftirqd/1
     23 ?        00:00:00 kworker/1:0H-events_highpri
     24 ?        00:00:00 cpuhp/2
     25 ?        00:00:23 migration/2
     26 ?        00:05:29 ksoftirqd/2
     28 ?        00:00:00 kworker/2:0H-events_highpri
     29 ?        00:00:00 cpuhp/3
     30 ?        00:00:22 migration/3
     31 ?        00:04:13 ksoftirqd/3
     33 ?        00:00:00 kworker/3:0H-events_highpri
     34 ?        00:00:00 cpuhp/4
     35 ?        00:00:17 migration/4
     36 ?        00:02:04 ksoftirqd/4
     38 ?        00:00:00 kworker/4:0H-events_highpri
     39 ?        00:00:00 cpuhp/5
     40 ?        00:00:17 migration/5
     41 ?        00:03:23 ksoftirqd/5
     43 ?        00:00:00 kworker/5:0H-events_highpri
     44 ?        00:00:00 cpuhp/6
     45 ?        00:00:16 migration/6
     46 ?        00:01:51 ksoftirqd/6
     48 ?        00:00:00 kworker/6:0H-events_highpri
     49 ?        00:00:00 cpuhp/7
     50 ?        00:00:16 migration/7
     51 ?        00:02:02 ksoftirqd/7
     53 ?        00:00:00 kworker/7:0H-events_highpri
     62 ?        00:00:00 kdevtmpfs
     63 ?        00:00:00 inet_frag_wq
     64 ?        00:00:00 kauditd
     66 ?        00:00:02 khungtaskd
     67 ?        00:00:00 oom_reaper
     68 ?        00:00:00 writeback
     69 ?        00:05:02 kcompactd0
     70 ?        00:00:00 ksmd
     71 ?        00:00:56 khugepaged
     72 ?        00:00:00 kintegrityd
     73 ?        00:00:00 kblockd
     74 ?        00:00:00 blkcg_punt_bio
     75 ?        00:00:00 tpm_dev_wq
     76 ?        00:00:00 edac-poller
     77 ?        00:00:00 devfreq_wq
     79 ?        00:01:09 kworker/4:1H-kblockd
     80 ?        00:01:52 kswapd0
     88 ?        00:00:00 kthrotld
     93 ?        00:00:00 acpi_thermal_pm
     94 ?        00:00:00 mld
     95 ?        00:02:04 kworker/0:1H-kblockd
     96 ?        00:00:00 ipv6_addrconf
    101 ?        00:00:00 kstrp
    106 ?        00:00:00 zswap-shrink
    107 ?        00:00:00 kworker/u17:0
    151 ?        00:01:58 kworker/2:1H-kblockd
    162 ?        00:02:00 kworker/1:1H-kblockd
    163 ?        00:14:34 kworker/3:1H-kblockd
    164 ?        00:00:39 kworker/7:1H-kblockd
    165 ?        00:00:59 kworker/5:1H-kblockd
    166 ?        00:00:54 kworker/6:1H-kblockd
    191 ?        00:00:00 ata_sff
    192 ?        00:00:00 scsi_eh_0
    193 ?        00:00:00 scsi_tmf_0
    194 ?        00:00:00 scsi_eh_1
    195 ?        00:00:00 scsi_tmf_1
    196 ?        00:00:00 scsi_eh_2
    197 ?        00:00:00 scsi_tmf_2
    198 ?        00:00:00 scsi_eh_3
    199 ?        00:00:00 scsi_tmf_3
    200 ?        00:00:00 scsi_eh_4
    201 ?        00:00:00 scsi_tmf_4
    202 ?        00:00:00 scsi_eh_5
    203 ?        00:00:00 scsi_tmf_5
    218 ?        00:00:00 md
    222 ?        01:06:14 md0_raid1
    228 ?        00:00:00 kdmflush/253:0
    229 ?        00:00:00 kdmflush/253:1
    248 ?        00:00:00 raid5wq
    281 ?        00:06:23 jbd2/dm-0-8
    282 ?        00:00:00 ext4-rsv-conver
    339 ?        00:39:51 systemd-journal
    376 ?        00:00:07 systemd-udevd
    435 ?        00:00:00 ipmi-msghandler
    457 ?        00:00:00 watchdogd
    464 ?        00:00:00 cryptd
    469 ?        00:00:51 mdadm
    470 ?        00:00:00 kipmi0
    633 ?        00:00:00 dhclient
    645 ?        00:00:24 rpcbind
    646 ?        00:00:22 systemd-timesyn
    648 ?        00:00:00 rpciod
    649 ?        00:00:00 xprtiod
    653 ?        00:00:00 acpid
    655 ?        00:00:11 cron
    656 ?        00:00:00 svscanboot
    657 ?        00:46:39 dbus-daemon
    659 ?        00:03:54 irqbalance
    661 ?        00:08:02 rsyslogd
    662 ?        00:00:05 smartd
    664 ?        00:17:08 systemd-logind
    665 ?        00:00:00 atd
    667 ?        00:02:55 svscan
    668 ?        00:00:00 readproctitle
    669 ?        00:00:00 supervise
    670 ?        00:00:00 supervise
    671 ?        00:00:00 supervise
    672 ?        00:00:00 supervise
    673 ?        00:00:00 supervise
    674 ?        00:00:00 supervise
    675 ?        00:00:00 supervise
    676 ?        00:00:00 supervise
    677 ?        00:00:00 supervise
    678 ?        00:00:00 supervise
    679 ?        00:00:00 supervise
    680 ?        00:00:00 supervise
    681 ?        00:00:00 supervise
    682 ?        00:00:00 supervise
    683 ?        00:00:00 supervise
    684 ?        00:00:00 supervise
    685 ?        00:00:00 supervise
    686 ?        00:00:00 supervise
    687 ?        00:00:00 supervise
    688 ?        00:00:00 supervise
    689 ?        00:00:00 supervise
    690 ?        00:00:00 supervise
    691 ?        00:00:00 supervise
    692 ?        00:00:00 supervise
    693 ?        00:00:00 supervise
    694 ?        00:00:00 supervise
    695 ?        00:00:00 supervise
    696 ?        00:00:00 supervise
    697 ?        00:00:00 supervise
    698 ?        00:00:00 supervise
    699 ?        00:00:00 supervise
    700 ?        00:00:00 supervise
    707 ?        00:00:00 run
    708 ?        00:00:00 sudo
    709 ?        00:00:00 run
    710 ?        00:00:00 run
    711 ?        00:00:00 run
    712 ?        00:00:00 run
    713 ?        00:00:00 run
    714 ?        00:00:00 sudo
    715 ?        00:00:00 run
    716 ?        00:00:00 run
    717 ?        00:00:00 sudo
    718 ?        00:00:00 run
    719 ?        00:00:00 run
    720 ?        00:00:00 run
    721 ?        00:00:00 run
    722 ?        00:00:00 sudo
    723 ?        00:00:00 run
    724 ?        00:00:00 run
    725 ?        00:00:00 sudo
    726 ?        00:00:00 sudo
    795 ?        00:00:00 sudo
    796 ?        00:00:00 run
    797 ?        00:00:00 run
    798 ?        00:00:00 sudo
    857 ?        00:02:52 multilog
    858 ?        00:00:00 multilog
    859 ?        00:02:53 multilog
    862 ?        00:00:00 multilog
    865 ?        00:07:01 multilog
    866 ?        00:00:00 multilog
    869 ?        00:00:00 multilog
    870 ?        00:06:54 multilog
    871 ?        00:06:57 multilog
    872 ?        00:00:00 multilog
    873 ?        00:02:51 multilog
    874 ?        00:00:00 multilog
    877 ?        30-07:21:07 python3
    878 ?        30-04:27:47 python3
    879 ?        49-14:23:57 python3
    880 ?        48-15:08:07 python3
    881 ?        29-20:51:10 python3
    882 ?        48-18:49:38 python3
    883 ?        30-04:57:58 python3
    884 ?        49-01:19:12 python3
    887 ?        00:06:58 multilog
    888 ?        00:00:00 multilog
    889 ?        00:00:00 multilog
    890 ?        00:02:50 multilog
    944 ?        00:00:00 agetty
    975 ?        00:00:00 agetty
   1179 ?        00:07:45 sshd
   1187 ?        00:25:19 exim4
2475968 ?        00:00:00 kworker/7:1-events
2476259 ?        00:00:00 kworker/0:0-cgroup_pidlist_destroy
2478294 ?        00:00:00 kworker/4:0-cgroup_pidlist_destroy
2479871 ?        00:00:00 kworker/2:4-events
2480316 ?        00:00:00 kworker/5:3-events
2480412 ?        00:00:00 kworker/3:1-cgroup_pidlist_destroy
2480727 ?        00:00:00 kworker/6:2-rcu_gp
2481225 ?        00:00:00 kworker/1:1-cgroup_pidlist_destroy
2481928 ?        00:00:00 kworker/2:1-events
2482105 ?        00:00:00 kworker/1:2-events
2482293 ?        00:00:00 kworker/4:2-events
2482735 ?        00:00:00 kworker/3:2-cgroup_pidlist_destroy
2482876 ?        00:00:00 kworker/u16:2-ext4-rsv-conversion
2483339 ?        00:00:00 kworker/5:0-events
2483358 ?        00:00:00 kworker/6:0-events
2483380 ?        00:00:00 kworker/0:3-cgroup_destroy
2483598 ?        00:00:00 kworker/2:0-cgroup_destroy
2483638 ?        00:00:00 kworker/1:3-cgroup_pidlist_destroy
2483658 ?        00:00:00 kworker/3:3-cgroup_destroy
2483671 ?        00:00:00 kworker/u16:1-writeback
2483672 ?        00:00:00 kworker/5:1-inet_frag_wq
2483686 ?        00:00:00 kworker/4:1-cgroup_pidlist_destroy
2484188 ?        00:00:00 kworker/7:0-events
2484225 ?        00:00:00 kworker/7:2-inet_frag_wq
2484635 ?        00:00:00 kworker/3:0+events
2484681 ?        00:00:00 kworker/u16:0-netns
2484697 ?        00:00:00 kworker/2:2-cgroup_pidlist_destroy
2484757 ?        00:00:00 kworker/1:0-events
2484776 ?        00:00:00 kworker/0:1-events
2484852 ?        00:00:00 kworker/6:1-cgroup_pidlist_destroy
2485290 ?        00:00:00 kworker/6:3-rcu_gp
2485340 ?        00:00:00 kworker/0:2-events
2485369 ?        00:00:00 bash
2485372 ?        00:00:00 secrun
2485378 ?        00:00:00 prog
2485381 ?        00:00:00 bash
2485382 ?        00:00:00 secrun
2485383 ?        00:00:00 prog
2485387 ?        00:00:00 ps
Both children have finished executing.
https://ideone.com/niOPAO
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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