68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
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/*-------------------------------------------------------------------------
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*
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* pgstrsignal.c
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* Identify a Unix signal number
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*
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* On platforms compliant with modern POSIX, this just wraps strsignal(3).
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* Elsewhere, we do the best we can.
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*
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* This file is not currently built in MSVC builds, since it's useless
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* on non-Unix platforms.
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*
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* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/port/pgstrsignal.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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/*
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* pg_strsignal
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*
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* Return a string identifying the given Unix signal number.
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*
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* The result is declared "const char *" because callers should not
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* modify the string. Note, however, that POSIX does not promise that
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* the string will remain valid across later calls to strsignal().
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*
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* This version guarantees to return a non-NULL pointer, although
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* some platforms' versions of strsignal() do not.
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*/
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const char *
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pg_strsignal(int signum)
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{
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const char *result;
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/*
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* If we have strsignal(3), use that --- but check its result for NULL.
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* Otherwise, if we have sys_siglist[], use that; just out of paranoia,
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* check for NULL there too. (We assume there is no point in trying both
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* APIs.)
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*/
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#if defined(HAVE_STRSIGNAL)
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result = strsignal(signum);
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if (result)
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return result;
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#elif defined(HAVE_DECL_SYS_SIGLIST) && HAVE_DECL_SYS_SIGLIST
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if (signum > 0 && signum < NSIG)
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{
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result = sys_siglist[signum];
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if (result)
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return result;
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}
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#endif
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/*
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* Fallback case: just return "unrecognized signal". Project style is for
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* callers to print the numeric signal value along with the result of this
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* function, so there's no need to work harder than this.
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*/
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result = "unrecognized signal";
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return result;
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}
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