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Replace use of sys_siglist[] with strsignal().

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This commit back-patches the v12-era commits a73d08319, cc92cca43,
and 7570df0f3 into supported pre-v12 branches.  The net effect is to
eliminate our former dependency on the never-standard sys_siglist[]
array, instead using POSIX-standard strsignal(3).

What motivates doing this now is that glibc just removed sys_siglist[]
from the set of symbols available to newly-built programs.  While our
code can survive without sys_siglist[], it then fails to print any
description of the signal that killed a child process, which is a
non-negligible loss of friendliness.  We can expect that people will
be wanting to build the back branches on platforms that include this
change, so we need to do something.

Since strsignal(3) has existed for quite a long time, and we've not
had any trouble with these patches so far in v12, it seems safe to
back-patch into older branches.

Discussion: https://postgr.es/m/3179114.1594853308@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2020-07-15 22:05:12 -04:00
parent 23924feca0
commit 0140dec180
12 changed files with 94 additions and 84 deletions
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9
configure.in
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@ -1516,6 +1516,7 @@ AC_CHECK_FUNCS(m4_normalize([
setproctitle
setsid
shm_open
strsignal
symlink
sync_file_range
towlower
@ -1717,14 +1718,6 @@ if test "$PORTNAME" = "cygwin"; then
AC_LIBOBJ(dirmod)
fi
AC_CHECK_DECLS([sys_siglist], [], [],
[#include <signal.h>
/* NetBSD declares sys_siglist in unistd.h. */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
])
AC_CHECK_FUNC(syslog,
[AC_CHECK_HEADER(syslog.h,
[AC_DEFINE(HAVE_SYSLOG, 1, [Define to 1 if you have the syslog interface.])])])