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Make 'stop' and 'suspend' regular built-ins

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The 'stop' and 'suspend' default aliases are now converted into
regular built-in commands so that 'unalias -a' does not remove
them, 'suspend' can do some sanity checks, and something like
	cmd=stop; $cmd $!
will now work.

src/cmd/ksh93/bltins/trap.c:
- b_kill(): Incorporate 'stop' functionality, which is simply
  setting the same flag and variable as '-s STOP' would have done.
- b_suspend(): Add simple builtin function that sends SIGSTOP to
  the main shell. Check for no operands, and refuse to suspend a
  login shell (which would leave the user stuck with no way out).
  Also check that 'kill' succeeds; if we're in an asynchronous
  subshell, it is possible the main shell no longer exists.

src/cmd/ksh93/data/aliases.c:
- Remove "stop" and "suspend" default aliases. (Why were these
  conditional upon SIGTSTP when they actually issued SIGSTOP?)

src/cmd/ksh93/include/builtins.h,
src/cmd/ksh93/data/builtins.c,
src/cmd/ksh93/data/msg.c:
- Add declarations of "stop" and "suspend" regular built-ins.
- Add option strings (AST manual/--man pages) for them.
- Add e_toomanyops ("too many operands") reusable error message for
  b_suspend(). Other new commands may want this at some point.

src/cmd/ksh93/sh.1:
- Remove "stop" and "suspend" default aliases.
- Document "stop" and "suspend" regular built-in commands.
This commit is contained in:
Martijn Dekker 2020-06-22 14:59:24 +02:00
parent add82e1984
commit 3ba4900e9c
8 changed files with 108 additions and 11 deletions
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8
src/cmd/ksh93/include/builtins.h
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@ -86,6 +86,9 @@ extern int b_unalias(int, char*[],Shbltin_t*);
# ifdef SIGTSTP
extern int b_bg(int, char*[],Shbltin_t*);
# endif /* SIGTSTP */
# ifdef SIGSTOP
extern int b_suspend(int, char*[],Shbltin_t*);
# endif /* SIGSTOP */
#endif
/* The following utilities are built-in because of side-effects */
@ -131,6 +134,7 @@ extern const char e_overlimit[];
extern const char e_eneedsarg[];
extern const char e_oneoperand[];
extern const char e_toomanyops[];
extern const char e_toodeep[];
extern const char e_badname[];
extern const char e_badsyntax[];
@ -172,6 +176,10 @@ extern const char sh_opthash[];
extern const char sh_opthist[];
extern const char sh_optjobs[];
extern const char sh_optkill[];
#if defined(JOBS) && defined(SIGSTOP)
extern const char sh_optstop[];
extern const char sh_optsuspend[];
#endif /* defined(JOBS) && defined(SIGSTOP) */
extern const char sh_optksh[];
extern const char sh_optlet[];
extern const char sh_optprint[];