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awesome.kill: allow negative PIDs (and 0) to support process groups 

From `kill(3p)`:

> If pid is greater than 0, sig shall be sent to the process whose
> process ID is equal to pid.

> If pid is 0, sig shall be sent to all processes (excluding an
> unspecified set of system processes) whose process group ID is equal to
> the process group ID of the sender, and for which the process has
> permission to send a signal.

> If pid is −1, sig shall be sent to all processes (excluding an
> unspecified set of system processes) for which the process has
> permission to send that signal.

> If  pid  is  negative,  but not −1, sig shall be sent to all processes
> (excluding an unspecified set of system processes) whose process group
> ID is equal to the absolute value of pid, and for which the process has
> permission to send a signal.
This commit is contained in:
Daniel Hahler 2018-06-28 15:28:14 +02:00
parent d7e09a0439
commit b3311674d2
1 changed files with 3 additions and 2 deletions
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5
luaa.c
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@ -254,7 +254,8 @@ luaA_restart(lua_State *L)
/** Send a signal to a process identified by its process id. See
* `awesome.unix_signal` for a list of signals.
* @tparam integer pid Process identifier
* @tparam integer pid Process identifier. 0 and negative values have special
* meaning. See `man 3 kill`.
* @tparam integer sig Signal number
* @treturn boolean true if the signal was successfully sent, else false
* @function kill
@ -262,7 +263,7 @@ luaA_restart(lua_State *L)
static int
luaA_kill(lua_State *L)
{
int pid = luaA_checknumber_range(L, 1, 1, INT_MAX);
int pid = lua_tonumber(L, 1);
int sig = luaA_checknumber_range(L, 2, 0, INT_MAX);
int result = kill(pid, sig);