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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) 1996-2018, 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() do not.
*/
const char *
pg_strsignal(int signum)
{
const char *result;
/*
* 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)
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;
}
#endif
/*
* Fallback case: just return "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 this.
*/
result = "unrecognized signal";
return result;
}
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