Process information in OpenBSD

procfs in the BSDs is either deprecated or removed altogether, sorry.That being said, it's also quite usual to have the sources for your system under /usr/src, so you can look at them if you really need to.Or you can just browse them on the web, eg http://bxr.su/o/bin/ps/ps.c

You can use sysctl to get the running processes in an array of kinfo_proc structures, this type is defined in:

/usr/include/sys/sysctl.h

The top command uses a function named getprocs that works this way, it's defined in:

/usr/src/usr.bin/top/machine.c

The next utility outputs information of all running processes using a slightly modified version of getprocs:

#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <kvm.h>#include <sys/sysctl.h>#define TRUE  1#define FALSE 0struct kinfo_proc * getprocs( int * count, int threads ){    struct kinfo_proc * procbase = NULL ;    unsigned int maxslp ;    size_t size = sizeof( maxslp ) ;    int maxslp_mib[] = { CTL_VM, VM_MAXSLP } ;    int mib[6] =    {        CTL_KERN,        KERN_PROC,        threads ? KERN_PROC_KTHREAD | KERN_PROC_SHOW_THREADS : KERN_PROC_KTHREAD,        0,        sizeof( struct kinfo_proc ),        0    } ;    if( sysctl( maxslp_mib, 2, &maxslp, &size, NULL, 0 ) == -1 )    {        perror( "list" ) ;        return NULL ;    }    retry:    if( sysctl( mib, 6, NULL, &size, NULL, 0 ) == -1 )    {        perror( "list" ) ;        return NULL ;    }    size = 5 * size / 4 ;           /* extra slop */    procbase = (struct kinfo_proc *)malloc( size ) ;    if( procbase == NULL )    {        perror( "list" ) ;        return NULL ;    }    mib[5] = (int)( size / sizeof( struct kinfo_proc ) ) ;    if( sysctl( mib, 6, procbase, &size, NULL, 0 ) )    {        if( errno == ENOMEM )        {            free( procbase ) ;            goto retry;        }        perror( "list" ) ;        return NULL ;    }    *count = (int)( size / sizeof( struct kinfo_proc ) ) ;    return procbase ;}int showinfo( int threads ){    struct kinfo_proc * list, * proc ;    int count, i ;    if( ( list = getprocs( &count, threads ) ) == NULL )    {        return 1 ;    }    proc = list ;    if( threads )    {        for( i = 0 ; i < count ; ++i, ++proc )        {            if( proc->p_tid != -1 )            {                printf( "%s: pid: %d (tid: %d)\n", proc->p_comm, proc->p_pid, proc->p_tid ) ;            }        }    }    else    {        for( i = 0 ; i < count ; ++i, ++proc )        {            printf( "%s: pid: %d\n", proc->p_comm, proc->p_pid ) ;        }    }    return 0 ;}int main( int argc, char * argv[] ){    if( argc == 1 )    {        return showinfo( FALSE ) ;    }    else if( argc == 2 && ( !strcmp( argv[1], "-t" ) || !strcmp( argv[1], "--threads" ) ) )    {        return showinfo( TRUE ) ;    }    else    {        printf( "Usage:\n" ) ;        printf( "      list [-h] [-t]\n\n" ) ;        printf( "Options:\n" ) ;        printf( "      -h, --help            Print this information\n" ) ;        printf( "      -t, --threads         Show threads\n\n" ) ;        return 0 ;    }}