LCOV - code coverage report
Current view: top level - src/port - pgstrsignal.c (source / functions) Hit Total Coverage
Test: PostgreSQL 13devel Lines: 4 5 80.0 %
Date: 2019-11-21 13:06:38 Functions: 1 1 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * pgstrsignal.c
       4             :  *    Identify a Unix signal number
       5             :  *
       6             :  * On platforms compliant with modern POSIX, this just wraps strsignal(3).
       7             :  * Elsewhere, we do the best we can.
       8             :  *
       9             :  * This file is not currently built in MSVC builds, since it's useless
      10             :  * on non-Unix platforms.
      11             :  *
      12             :  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
      13             :  * Portions Copyright (c) 1994, Regents of the University of California
      14             :  *
      15             :  * IDENTIFICATION
      16             :  *    src/port/pgstrsignal.c
      17             :  *
      18             :  *-------------------------------------------------------------------------
      19             :  */
      20             : 
      21             : #include "c.h"
      22             : 
      23             : 
      24             : /*
      25             :  * pg_strsignal
      26             :  *
      27             :  * Return a string identifying the given Unix signal number.
      28             :  *
      29             :  * The result is declared "const char *" because callers should not
      30             :  * modify the string.  Note, however, that POSIX does not promise that
      31             :  * the string will remain valid across later calls to strsignal().
      32             :  *
      33             :  * This version guarantees to return a non-NULL pointer, although
      34             :  * some platforms' versions of strsignal() reputedly do not.
      35             :  *
      36             :  * Note that the fallback cases just return constant strings such as
      37             :  * "unrecognized signal".  Project style is for callers to print the
      38             :  * numeric signal value along with the result of this function, so
      39             :  * there's no need to work harder than that.
      40             :  */
      41             : const char *
      42           2 : pg_strsignal(int signum)
      43             : {
      44             :     const char *result;
      45             : 
      46             :     /*
      47             :      * If we have strsignal(3), use that --- but check its result for NULL.
      48             :      */
      49             : #ifdef HAVE_STRSIGNAL
      50           2 :     result = strsignal(signum);
      51           2 :     if (result == NULL)
      52           0 :         result = "unrecognized signal";
      53             : #else
      54             : 
      55             :     /*
      56             :      * We used to have code here to try to use sys_siglist[] if available.
      57             :      * However, it seems that all platforms with sys_siglist[] have also had
      58             :      * strsignal() for many years now, so that was just a waste of code.
      59             :      */
      60             :     result = "(signal names not available on this platform)";
      61             : #endif
      62             : 
      63           2 :     return result;
      64             : }

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