builtin-trap.test.sh

#!/bin/bash

#### trap -l
trap -l | grep INT >/dev/null
## status: 0
## N-I dash/mksh status: 1

#### trap -p
trap 'echo exit' EXIT
trap -p | grep EXIT >/dev/null
## status: 0
## N-I dash/mksh status: 1

#### Register invalid trap
trap 'foo' SIGINVALID
## status: 1

#### Remove invalid trap
trap - SIGINVALID
## status: 1

#### SIGINT and INT are aliases
trap - SIGINT
echo $?
trap - INT
echo $?
## STDOUT:
0
0
## END
## N-I dash STDOUT:
1
0
## END

#### Invalid trap invocation
trap 'foo'
echo status=$?
## stdout: status=2
## OK dash stdout: status=1
## BUG mksh stdout: status=0

#### exit 1 when trap code string is invalid
# All shells spew warnings to stderr, but don't actually exit!  Bad!
trap 'echo <' EXIT
echo status=$?
## stdout: status=1
## BUG mksh status: 1
## BUG mksh stdout: status=0
## BUG dash/bash status: 0
## BUG dash/bash stdout: status=0

#### trap EXIT calling exit
cleanup() {
  echo "cleanup [$@]"
  exit 42
}
trap 'cleanup x y z' EXIT
## stdout: cleanup [x y z]
## status: 42

#### trap EXIT return status ignored
cleanup() {
  echo "cleanup [$@]"
  return 42
}
trap 'cleanup x y z' EXIT
## stdout: cleanup [x y z]
## status: 0

#### trap EXIT with PARSE error
trap 'echo FAILED' EXIT
for
## stdout: FAILED
## status: 2
## OK mksh status: 1

#### trap EXIT with PARSE error and explicit exit
trap 'echo FAILED; exit 0' EXIT
for
## stdout: FAILED
## status: 0

#### trap DEBUG
debuglog() {
  echo "debuglog [$@]"
}
trap 'debuglog x y' DEBUG
echo 1
echo 2
## STDOUT:
debuglog [x y]
1
debuglog [x y]
2
## END
## N-I dash/mksh STDOUT:
1
2
## END

#### trap RETURN
profile() {
  echo "profile [$@]"
}
g() {
  echo --
  echo g
  echo --
  return
}
f() {
  echo --
  echo f
  echo --
  g
}
# RETURN trap doesn't fire when a function returns, only when a script returns?
# That's not what the manual syas.
trap 'profile x y' RETURN
f
. spec/testdata/return-helper.sh
## status: 42
## STDOUT:
--
f
--
--
g
--
return-helper.sh
profile [x y]
## END
## N-I dash/mksh STDOUT:
--
f
--
--
g
--
return-helper.sh
## END

#### trap ERR and disable it
err() {
  echo "err [$@] $?"
}
trap 'err x y' ERR 
echo 1
false
echo 2
trap - ERR  # disable trap
false
echo 3
## STDOUT:
1
err [x y] 1
2
3
## END
## N-I dash STDOUT:
1
2
3
## END

#### trap 0 is equivalent to EXIT
# not sure why this is, but POSIX wants it.
trap 'echo EXIT' 0
echo status=$?
trap - EXIT
echo status=$?
## status: 0
## STDOUT:
status=0
status=0
## END

#### trap 1 is equivalent to SIGHUP; HUP is equivalent to SIGHUP
trap 'echo HUP' SIGHUP
echo status=$?
trap 'echo HUP' HUP
echo status=$?
trap 'echo HUP' 1
echo status=$?
trap - HUP
echo status=$?
## status: 0
## STDOUT:
status=0
status=0
status=0
status=0
## END
## N-I dash STDOUT:
status=1
status=0
status=0
status=0
## END

#### eval in the exit trap (regression for issue #293)
trap 'eval "echo hi"' 0
## STDOUT:
hi
## END