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lightningd: print out what errno we got if unexpected in sigchild.

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Looking at #4575, I'm not sure what happened.  This prints it out, at least.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2021-06-29 14:18:05 +09:30
parent 8f33f46960
commit 85562db432
1 changed files with 7 additions and 2 deletions
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9
lightningd/lightningd.c
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@ -713,8 +713,13 @@ static void on_sigchild(int _ UNUSED)
* there are no more children. But glibc's overzealous use of
* __attribute__((warn_unused_result)) means we have to
* "catch" the return value. */
if (write(sigchld_wfd, "", 1) != 1)
assert(errno == EAGAIN || errno == EWOULDBLOCK);
if (write(sigchld_wfd, "", 1) != 1) {
if (errno != EAGAIN && errno == EWOULDBLOCK) {
/* Should not call this in a signal handler, but we're
* already messed up! */
fatal("on_sigchild: write errno %s", strerror(errno));
}
}
}
/*~ We only need to handle SIGTERM and SIGINT for the case we are PID 1 of