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runsv: code shrink: use single handler function for SIGTERM and SIGCHLD

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function                                             old     new   delta
s_chld_term                                            -      36     +36
runsv_main                                          1677    1662     -15
s_child                                               22       -     -22
s_term                                                29       -     -29
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 0/1 up/down: 36/-66)            Total: -30 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-06-05 16:36:21 +02:00
parent 5dadd497ff
commit 5a72b0cd74
1 changed files with 8 additions and 9 deletions
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17
runit/runsv.c
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@ -149,19 +149,16 @@ static void warn_cannot(const char *m)
warn2_cannot(m, "");
}
/* SIGCHLD/TERM handlers are reentrancy-safe because they are unmasked
/* SIGCHLD/TERM handler is reentrancy-safe because they are unmasked
* only over poll() call, not over memory allocations
* or printouts. Do not need to save/restore errno either,
* as poll() error is not checked there.
*/
static void s_child(int sig_no UNUSED_PARAM)
{
write(selfpipe.wr, "", 1);
}
static void s_term(int sig_no UNUSED_PARAM)
static void s_chld_term(int sig_no)
{
if (sig_no == SIGTERM)
sigterm = 1;
write(selfpipe.wr, "", 1); /* XXX */
write(selfpipe.wr, "", 1);
}
static int open_trunc_or_warn(const char *name)
@ -523,8 +520,10 @@ int runsv_main(int argc UNUSED_PARAM, char **argv)
* (poll() wouldn't restart regardless of that flag),
* we just follow what runit-2.1.2 does:
*/
bb_signals_norestart(1 << SIGCHLD, s_child);
bb_signals_norestart(1 << SIGTERM, s_term);
bb_signals_norestart(0
+ (1 << SIGCHLD)
+ (1 << SIGTERM)
, s_chld_term);
xchdir(dir);
/* bss: svd[0].pid = 0; */