def forktest():
printf(1, "fork test\n")
for n in range(1000):
pid = fork()
if pid < 0:
break
if pid == 0:
exit_()
if n == 1000:
printf(1, "fork claimed to work 1000 times!\n")
exit_()
while n > 0:
if wait() < 0:
printf(1, "wait stopped early\n")
exit_(1)
n -= 1
if wait() != -1:
printf(1, "wait got too many\n")
exit_(1)
printf(1, "fork test OK\n")
def main():
if open_("console", O_RDWR) < 0:
mknod("console", 1, 1)
open_("console", O_RDWR)
dup(0) # stdout
dup(0) # stderr
while True:
printf(1, "init: starting sh\n")
pid = fork()
if pid < 0:
printf(1, "init: fork failed\n")
exit()
if pid == 0:
exec_("sh", argv)
printf(1, "init: exec sh failed\n")
exit()
while True:
wpid = wait()
if wpid < 0 or wpid == pid:
break
print(1, "zombie!\n")
def runcmd(cmd):
p = [0, 0]
if cmd == 0:
exit_()
if cmd.type == EXEC:
ecmd = cmd
if ecmd.argv[0] == 0:
exit_()
exec_(ecmd.argv[0], ecmd.argv)
printf(2, "exec %s failed\n", ecmd.argv[0])
elif cmd.type == REDIR:
rcmd = cmd
close(rcmd.fd)
if open_(rcmd.file, rcmd.mode) < 0:
printf(2, "open %s failed\n", rcmd.file)
exit_()
runcmd(rcmd.cmd)
elif cmd.type == LIST:
lcmd = cmd
# if fork1() == 0:
# runcmd(lcmd.left)
# wait()
# runcmd(lcmd.right)
fork1(runcmd, lcmd.left)
wait()
runcmd(lcmd.right)
elif cmd.type == PIPE:
pcmd = cmd
if pipe(p) < 0:
panic("pipe")
if fork1() == 0:
close(1)
dup(p[1])
close(p[0])
close(p[1])
runcmd(pcmd.left)
if fork1() == 0:
close(0)
dup(p[0])
close(p[0])
close(p[1])
runcmd(pcmd.right)
close(p[0])
close(p[1])
wait()
wait()
elif cmd.type == BACK:
bcmd = cmd
if fork1() == 0:
runcmd(bcmd.cmd)
else:
panic("runcmd")
exit_()