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Drop support for getting signal descriptions from sys_siglist[].

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It appears that all platforms that have sys_siglist[] also have
strsignal(), making that fallback case in pg_strsignal() dead code.
Getting rid of it allows dropping a configure test, which seems worth
more than providing textual signal descriptions on whatever platforms
might still hypothetically have use for the fallback case.

Discussion: https://postgr.es/m/25758.1544983503@sss.pgh.pa.us
This commit is contained in:
Tom Lane 2018-12-17 13:50:07 -05:00
parent ca4103025d
commit cc92cca431
4 changed files with 9 additions and 42 deletions
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18
configure vendored
View File

@ -16064,24 +16064,6 @@ esac
fi
ac_fn_c_check_decl "$LINENO" "sys_siglist" "ac_cv_have_decl_sys_siglist" "#include <signal.h>
/* NetBSD declares sys_siglist in unistd.h. */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
"
if test "x$ac_cv_have_decl_sys_siglist" = xyes; then :
ac_have_decl=1
else
ac_have_decl=0
fi
cat >>confdefs.h <<_ACEOF
#define HAVE_DECL_SYS_SIGLIST $ac_have_decl
_ACEOF
ac_fn_c_check_func "$LINENO" "syslog" "ac_cv_func_syslog"
if test "x$ac_cv_func_syslog" = xyes; then :
ac_fn_c_check_header_mongrel "$LINENO" "syslog.h" "ac_cv_header_syslog_h" "$ac_includes_default"

8
configure.in
View File

@ -1787,14 +1787,6 @@ 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.])])])

4
src/include/pg_config.h.in
View File

@ -192,10 +192,6 @@
don't. */
#undef HAVE_DECL_STRTOULL
/* Define to 1 if you have the declaration of `sys_siglist', and to 0 if you
don't. */
#undef HAVE_DECL_SYS_SIGLIST
/* Define to 1 if you have the `dlopen' function. */
#undef HAVE_DLOPEN

21
src/port/pgstrsignal.c
View File

@ -31,7 +31,7 @@
* the string will remain valid across later calls to strsignal().
*
* This version guarantees to return a non-NULL pointer, although
* some platforms' versions of strsignal() do not.
* some platforms' versions of strsignal() reputedly do not.
*/
const char *
pg_strsignal(int signum)
@ -40,21 +40,18 @@ pg_strsignal(int signum)
/*
* If we have strsignal(3), use that --- but check its result for NULL.
* Otherwise, if we have sys_siglist[], use that; just out of paranoia,
* check for NULL there too. (We assume there is no point in trying both
* APIs.)
*/
#if defined(HAVE_STRSIGNAL)
#ifdef HAVE_STRSIGNAL
result = strsignal(signum);
if (result)
return result;
#elif defined(HAVE_DECL_SYS_SIGLIST) && HAVE_DECL_SYS_SIGLIST
if (signum > 0 && signum < NSIG)
{
result = sys_siglist[signum];
if (result)
return result;
}
#else
/*
* We used to have code here to try to use sys_siglist[] if available.
* However, it seems that all platforms with sys_siglist[] have also had
* strsignal() for many years now, so that was just a waste of code.
*/
#endif
/*