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before:
this_module = 'posix.sys.msg'
global_table = '_G'
M = require(this_module)
specify posix.sys.msg:
- context when required:
- it does not touch the global table:
expect(show_apis {added_to=global_table, by=this_module}).
to_equal {}
- before:
errno = require 'posix.errno'
msg = require 'posix.sys.msg'
st = require 'posix.sys.stat'
unistd = require 'posix.unistd'
EPOCH = require 'posix.time'.time()
EEXIST = errno.EEXIST
msgget, msgsnd, msgrcv = M.msgget, M.msgsnd, M.msgrcv
IPC_CREAT, IPC_EXCL = M.IPC_CREAT, M.IPC_EXCL
S_IRUSR, S_IRGRP, S_IROTH = st.S_IRUSR, st.S_IRGRP, st.S_IROTH
S_IWUSR, S_IWGRP, S_IWOTH = st.S_IWUSR, st.S_IWGRP, st.S_IWOTH
mode = bor(S_IRUSR, S_IRGRP, S_IROTH, S_IWUSR, S_IWGRP, S_IWOTH)
mq, err, errnum = msgget(100, bor(IPC_CREAT, IPC_EXCL, mode))
if errnum == EEXIST then
mq, err = msgget(100, mode)
end
mtype = 42
mdata = 'Answer to the Ultimate Question of Life'
- describe msgget:
- context with bad arguments:
badargs.diagnose(msgget, ' (int, ?int)')
- it creates a queue:
expect(mq).not_to_be(nil)
expect(err).to_be(nil)
- describe msgsnd:
- context with bad arguments:
badargs.diagnose(msgsnd, ' (int, int, string, ?int)')
- it sends a message:
ok, err = msgsnd(mq, mtype, mdata)
expect(ok).not_to_be(err)
- describe msgrcv:
- context with bad arguments:
badargs.diagnose(msgrcv, ' (int, int, ?int, ?int)')
- it receives a message:
expect({msgrcv(mq, 128)}).to_equal {mtype, mdata, nil}
- describe msgctl:
- before:
msgctl = M.msgctl
IPC_RMID, IPC_SET, IPC_STAT = M.IPC_RMID, M.IPC_SET, M.IPC_STAT
objtype = function(x) return(getmetatable(x) or {})._type end
- context with bad arguments:
# Not really 'any*' for arg3, but that's all we can do without knowing arg2!
badargs.diagnose(msgctl, ' (int, int, any*)')
- context with IPC_STAT:
- it diagnoses too many arguments:
expect(msgctl(mq, IPC_STAT, false)).
to_raise 'no more than 2 arguments expected, got 3'
- it returns a new table on each invocation:
expect(msgctl(mq, IPC_STAT)).not_to_be(msgctl(mq, IPC_STAT))
- it returns correctly populated PosixMsqid table:
msqid = msgctl(mq, IPC_STAT)
expect(objtype(msqid)).to_be 'PosixMsqid'
expect(type(msqid.msg_qnum)).to_be 'number'
expect(type(msqid.msg_qbytes)).to_be 'number'
expect(msqid.msg_lspid).to_be(unistd.getpid())
expect(msqid.msg_lrpid).to_be(unistd.getpid())
expect(msqid.msg_stime).to_be_within_n_of {value=EPOCH, delta=1}
expect(msqid.msg_rtime).to_be_within_n_of {value=EPOCH, delta=1}
expect(msqid.msg_perm.uid).to_be(unistd.getuid())
expect(msqid.msg_perm.gid).to_be(unistd.getgid())
expect(msqid.msg_perm.cuid).to_be(msqid.msg_perm.uid)
expect(msqid.msg_perm.cgid).to_be(msqid.msg_perm.gid)
expect(msqid.msg_perm.mode).to_be(mode)
- context with IPC_SET:
- before:
sleep = require 'posix.unistd'.sleep
msqid = {
msg_perm = {
uid = unistd.getuid(),
gid = unistd.getgid(),
mode = mode,
},
msg_qbytes = 1024,
}
- 'it diagnoses missing argument #3':
expect(msgctl(mq, IPC_SET)).to_raise 'table expected, got no value'
- 'it diagnoses argument #3 type not table':
expect(msgctl(mq, IPC_SET, false)).to_raise 'table expected, got boolean'
- 'it diagnoses argument #3 with missing fields':
msqid.msg_qbytes = nil
expect(msgctl(mq, IPC_SET, msqid)).
to_raise "integer expected for field 'msg_qbytes', got no value"
expect(msgctl(mq, IPC_SET, {msg_qbytes=1024})).
to_raise "table expected for field 'msg_perm', got no value"
- 'it diagnoses argument #3 with bad field types':
msqid.msg_qbytes = false
expect(msgctl(mq, IPC_SET, msqid)).
to_raise "integer expected for field 'msg_qbytes', got boolean"
expect(msgctl(mq, IPC_SET, {msg_qbytes=1024, msg_perm=false})).
to_raise "table expected for field 'msg_perm', got boolean"
- 'it diagnoses argument #3 with bad field names':
msqid.bogus = 1
expect(msgctl(mq, IPC_SET, msqid)).
to_raise "invalid field name 'bogus'"
- 'it diagnoses argument #3 with missing subfields':
msqid.msg_perm.mode = nil
expect(msgctl(mq, IPC_SET, msqid)).
to_raise "integer expected for field 'mode', got no value"
- 'it diagnoses argument #3 with bad subfield types':
msqid.msg_perm.mode = false
expect(msgctl(mq, IPC_SET, msqid)).
to_raise "integer expected for field 'mode', got boolean"
- 'it diagnoses argument #3 with bad subfield names':
msqid.msg_perm.bogus = 1
expect(msgctl(mq, IPC_SET, msqid)).
to_raise "invalid field name 'bogus'"
- it diagnoses too many arguments:
expect(msgctl(mq, IPC_SET, {}, nil)).
to_raise 'no more than 3 arguments expected, got 4'
- it sets specified fields in the message queue:
expect(msgctl(mq, IPC_SET, msqid)).not_to_be(nil)
r = msgctl(mq, IPC_STAT)
expect(r.msg_perm.uid).to_be(unistd.getuid())
expect(r.msg_perm.gid).to_be(unistd.getgid())
expect(r.msg_perm.mode).to_be(mode)
expect(r.msg_qbytes).to_be(1024)
- it updates ctime field:
msqid.msg_qbytes = 666
ctime = msgctl(mq, IPC_STAT).msg_ctime
expect(ctime).not_to_be(nil)
sleep(2)
expect(msgctl(mq, IPC_SET, msqid)).not_to_be(nil)
expect(msgctl(mq, IPC_STAT).msg_ctime).not_to_be(ctime)
- context with IPC_RMID:
- it diagnoses too many arguments to IPC_RMID cmd:
expect(msgctl(mq, IPC_RMID, false)).to_raise 'no more than 2 arguments expected, got 3'
- it removes a queue:
ok, err = msgctl(mq, IPC_RMID)
expect(ok).not_to_be(err)
- it diagnoses a bad queue: |
ok, err = msgctl(mq, IPC_RMID)
expect(ok).to_be(nil)
expect(err).to_contain 'msgctl: '
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