newlib/libc/signal/psignal.c

   1 /* Copyright 2002, 2011 Red Hat Inc. */
   2 /*
   3 FUNCTION
   4 <<psignal>>---print a signal message on standard error
   5
   6 INDEX
   7         psignal
   8
   9 SYNOPSIS
  10         #include <stdio.h>
  11         void psignal(int <[signal]>, const char *<[prefix]>);
  12
  13 DESCRIPTION
  14 Use <<psignal>> to print (on standard error) a signal message
  15 corresponding to the value of the signal number <[signal]>.
  16 Unless you use <<NULL>> as the value of the argument <[prefix]>, the
  17 signal message will begin with the string at <[prefix]>, followed by a
  18 colon and a space (<<: >>). The remainder of the signal message is one
  19 of the strings described for <<strsignal>>.
  20
  21 RETURNS
  22 <<psignal>> returns no result.
  23
  24 PORTABILITY
  25 POSIX.1-2008 requires <<psignal>>, but the strings issued vary from one
  26 implementation to another.
  27
  28 Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
  29 <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
  30 */
  31
  32 #include <_ansi.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36
  37 #define WRITE_STR(str) \
  38 { \
  39   const char *p = (str); \
  40   size_t len = strlen (p); \
  41   while (len) \
  42     { \
  43       ssize_t len1 = write (fileno (stderr), p, len); \
  44       if (len1 < 0) \
  45         break; \
  46       len -= len1; \
  47       p += len1; \
  48     } \
  49 }
  50
  51 void
  52 psignal (int sig,
  53        const char *s)
  54 {
  55   fflush (stderr);
  56   if (s != NULL && *s != '\0')
  57     {
  58       WRITE_STR (s);
  59       WRITE_STR (": ");
  60     }
  61   WRITE_STR (strsignal (sig));
  62
  63 #ifdef __SCLE
  64   WRITE_STR ((stderr->_flags & __SCLE) ? "\r\n" : "\n");
  65 #else
  66   WRITE_STR ("\n");
  67 #endif
  68 }