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/*-------------------------------------------------------------------------
*
* pgstrsignal.c
* Identify a Unix signal number
*
* On platforms compliant with modern POSIX, this just wraps strsignal(3).
* Elsewhere, we do the best we can.
*
* This file is not currently built in MSVC builds, since it's useless
* on non-Unix platforms.
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/port/pgstrsignal.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
/*
* pg_strsignal
*
* Return a string identifying the given Unix signal number.
*
* The result is declared "const char *" because callers should not
* modify the string. Note, however, that POSIX does not promise that
* 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() reputedly do not.
*
* Note that the fallback cases just return constant strings such as
* "unrecognized signal". Project style is for callers to print the
* numeric signal value along with the result of this function, so
* there's no need to work harder than that.
*/
const char *
pg_strsignal(int signum)
{
const char *result;
/*
* If we have strsignal(3), use that --- but check its result for NULL.
*/
#ifdef HAVE_STRSIGNAL
result = strsignal(signum);
if (result == NULL)
result = "unrecognized signal";
#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.
*/
result = "(signal names not available on this platform)";
#endif
return result;
}
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