Unix v6 System Calls List

/*
 * This table is the switch used to transfer
 * to the appropriate routine for processing a system call.
 * Each row contains the number of arguments expected
 * and a pointer to the routine.
 */
int     sysent[]
{
        0, &nullsys,                    /*  0 = indir */
        0, &rexit,                      /*  1 = exit */
        0, &fork,                       /*  2 = fork */
        2, &read,                       /*  3 = read */
        2, &write,                      /*  4 = write */
        2, &open,                       /*  5 = open */
        0, &close,                      /*  6 = close */
        0, &wait,                       /*  7 = wait */
        2, &creat,                      /*  8 = creat */
        2, &link,                       /*  9 = link */
        1, &unlink,                     /* 10 = unlink */
        2, &exec,                       /* 11 = exec */
        1, &chdir,                      /* 12 = chdir */
        0, &gtime,                      /* 13 = time */
        3, &mknod,                      /* 14 = mknod */
        2, &chmod,                      /* 15 = chmod */
        2, &chown,                      /* 16 = chown */
        1, &sbreak,                     /* 17 = break */
        2, &stat,                       /* 18 = stat */
        2, &seek,                       /* 19 = seek */
        0, &getpid,                     /* 20 = getpid */
        3, &smount,                     /* 21 = mount */
        1, &sumount,                    /* 22 = umount */
        0, &setuid,                     /* 23 = setuid */
        0, &getuid,                     /* 24 = getuid */
        0, &stime,                      /* 25 = stime */
        3, &ptrace,                     /* 26 = ptrace */
        0, &nosys,                      /* 27 = x */
        1, &fstat,                      /* 28 = fstat */
        0, &nosys,                      /* 29 = x */
        1, &nullsys,                    /* 30 = smdate; inoperative */
        1, &stty,                       /* 31 = stty */
        1, &gtty,                       /* 32 = gtty */
        0, &nosys,                      /* 33 = x */
        0, &nice,                       /* 34 = nice */
        0, &sslep,                      /* 35 = sleep */
        0, &sync,                       /* 36 = sync */
        1, &kill,                       /* 37 = kill */
        0, &getswit,                    /* 38 = switch */
        0, &nosys,                      /* 39 = x */
        0, &nosys,                      /* 40 = x */
        0, &dup,                        /* 41 = dup */
        0, &pipe,                       /* 42 = pipe */
        1, &times,                      /* 43 = times */
        4, &profil,                     /* 44 = prof */
        0, &nosys,                      /* 45 = tiu */
        0, &setgid,                     /* 46 = setgid */
        0, &getgid,                     /* 47 = getgid */
        2, &ssig,                       /* 48 = sig */
        0, &nosys,                      /* 49 = x */
        0, &nosys,                      /* 50 = x */
        0, &nosys,                      /* 51 = x */
        0, &nosys,                      /* 52 = x */
        0, &nosys,                      /* 53 = x */
        0, &nosys,                      /* 54 = x */
        0, &nosys,                      /* 55 = x */
        0, &nosys,                      /* 56 = x */
        0, &nosys,                      /* 57 = x */
        0, &nosys,                      /* 58 = x */
        0, &nosys,                      /* 59 = x */
        0, &nosys,                      /* 60 = x */
        0, &nosys,                      /* 61 = x */
        0, &nosys,                      /* 62 = x */
        0, &nosys                       /* 63 = x */
};
/* ---------------------------       */