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Commit e09767cd authored by Sergei Golubchik's avatar Sergei Golubchik
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restore my_safe_printf_stderr for "crash-safe sigsegv handler" 

use vsnprintf()
use write() on windows, not WriteFile or fwrite()
localtime_r is still a problem
parent 948d1d5b
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Showing with 13 additions and 231 deletions
include/my_global.h
View file @ e09767cd
......@@ -569,6 +569,10 @@ int __void__;
#endif
#endif /* DONT_DEFINE_VOID */
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif
/*
Deprecated workaround for false-positive uninitialized variables
warnings. Those should be silenced using tool-specific heuristics.
......
include/my_stacktrace.h
View file @ e09767cd
......@@ -61,50 +61,6 @@ void my_set_exception_pointers(EXCEPTION_POINTERS *ep);
void my_write_core(int sig);
#endif
/**
Async-signal-safe utility functions used by signal handler routines.
Declared here in order to unit-test them.
These are not general-purpose, but tailored to the signal handling routines.
*/
/**
Converts a longlong value to string.
@param base 10 for decimal, 16 for hex values (0..9a..f)
@param val The value to convert
@param buf Assumed to point to the *end* of the buffer.
@returns Pointer to the first character of the converted string.
Negative values:
for base-10 the return string will be prepended with '-'
for base-16 the return string will contain 16 characters
Implemented with simplicity, and async-signal-safety in mind.
*/
char *my_safe_itoa(int base, longlong val, char *buf);
/**
Converts a ulonglong value to string.
@param base 10 for decimal, 16 for hex values (0..9a..f)
@param val The value to convert
@param buf Assumed to point to the *end* of the buffer.
@returns Pointer to the first character of the converted string.
Implemented with simplicity, and async-signal-safety in mind.
*/
char *my_safe_utoa(int base, ulonglong val, char *buf);
/**
A (very) limited version of snprintf.
@param to Destination buffer.
@param n Size of destination buffer.
@param fmt printf() style format string.
@returns Number of bytes written, including terminating '\0'
Supports 'd' 'i' 'u' 'x' 'p' 's' conversion.
Supports 'l' and 'll' modifiers for integral types.
Does not support any width/precision.
Implemented with simplicity, and async-signal-safety in mind.
*/
size_t my_safe_snprintf(char* to, size_t n, const char* fmt, ...)
ATTRIBUTE_FORMAT(printf, 3, 4);
/**
A (very) limited version of snprintf, which writes the result to STDERR.
@sa my_safe_snprintf
......
mysys/stacktrace.c
View file @ e09767cd
......@@ -685,7 +685,7 @@ void my_print_stacktrace(uchar* unused1, ulong unused2)
&(package.sym));
have_source= pSymGetLineFromAddr64(hProcess, addr, &line_offset, &line);
fprintf(stderr,"%p ", addr);
my_safe_printf_stderr("%p ", addr);
if(have_module)
{
char *base_image_name= strrchr(module.ImageName, '\\');
......@@ -693,12 +693,13 @@ void my_print_stacktrace(uchar* unused1, ulong unused2)
base_image_name++;
else
base_image_name= module.ImageName;
fprintf(stderr,"%s!", base_image_name);
my_safe_printf_stderr("%s!", base_image_name);
}
if(have_symbol)
fprintf(stderr, "%s()", package.sym.Name);
my_safe_printf_stderr("%s()", package.sym.Name);
else if(have_module)
fprintf(stderr,"%s", "???");
my_safe_printf_stderr("%s", "???");
if(have_source)
{
......@@ -707,10 +708,10 @@ void my_print_stacktrace(uchar* unused1, ulong unused2)
base_file_name++;
else
base_file_name= line.FileName;
fprintf(stderr, "[%s:%u]",
my_safe_printf_stderr("[%s:%u]",
base_file_name, line.LineNumber);
}
fprintf(stderr,"%s", "\n");
my_safe_printf_stderr("%s", "\n");
}
}
......@@ -781,189 +782,10 @@ void my_safe_print_str(const char *val, int len)
#endif /*__WIN__*/
#ifdef __WIN__
size_t my_write_stderr(const void *buf, size_t count)
{
return fwrite(buf, 1, count, stderr);
}
#else
size_t my_write_stderr(const void *buf, size_t count)
{
return (size_t) write(STDERR_FILENO, buf, count);
}
#endif
static const char digits[]= "0123456789abcdef";
char *my_safe_utoa(int base, ulonglong val, char *buf)
{
*buf--= 0;
do {
*buf--= digits[val % base];
} while ((val /= base) != 0);
return buf + 1;
}
char *my_safe_itoa(int base, longlong val, char *buf)
{
char *orig_buf= buf;
const my_bool is_neg= (val < 0);
*buf--= 0;
if (is_neg)
val= -val;
if (is_neg && base == 16)
{
int ix;
val-= 1;
for (ix= 0; ix < 16; ++ix)
buf[-ix]= '0';
}
do {
*buf--= digits[val % base];
} while ((val /= base) != 0);
if (is_neg && base == 10)
*buf--= '-';
if (is_neg && base == 16)
{
int ix;
buf= orig_buf - 1;
for (ix= 0; ix < 16; ++ix, --buf)
{
switch (*buf)
{
case '0': *buf= 'f'; break;
case '1': *buf= 'e'; break;
case '2': *buf= 'd'; break;
case '3': *buf= 'c'; break;
case '4': *buf= 'b'; break;
case '5': *buf= 'a'; break;
case '6': *buf= '9'; break;
case '7': *buf= '8'; break;
case '8': *buf= '7'; break;
case '9': *buf= '6'; break;
case 'a': *buf= '5'; break;
case 'b': *buf= '4'; break;
case 'c': *buf= '3'; break;
case 'd': *buf= '2'; break;
case 'e': *buf= '1'; break;
case 'f': *buf= '0'; break;
}
}
}
return buf+1;
}
static const char *check_longlong(const char *fmt, my_bool *have_longlong)
{
*have_longlong= FALSE;
if (*fmt == 'l')
{
fmt++;
if (*fmt != 'l')
*have_longlong= (sizeof(long) == sizeof(longlong));
else
{
fmt++;
*have_longlong= TRUE;
}
}
return fmt;
}
static size_t my_safe_vsnprintf(char *to, size_t size,
const char* format, va_list ap)
{
char *start= to;
char *end= start + size - 1;
for (; *format; ++format)
{
my_bool have_longlong = FALSE;
if (*format != '%')
{
if (to == end) /* end of buffer */
break;
*to++= *format; /* copy ordinary char */
continue;
}
++format; /* skip '%' */
format= check_longlong(format, &have_longlong);
switch (*format)
{
case 'd':
case 'i':
case 'u':
case 'x':
case 'p':
{
longlong ival= 0;
ulonglong uval = 0;
if (*format == 'p')
have_longlong= (sizeof(void *) == sizeof(longlong));
if (have_longlong)
{
if (*format == 'u')
uval= va_arg(ap, ulonglong);
else
ival= va_arg(ap, longlong);
}
else
{
if (*format == 'u')
uval= va_arg(ap, unsigned int);
else
ival= va_arg(ap, int);
}
{
char buff[22];
const int base= (*format == 'x' || *format == 'p') ? 16 : 10;
char *val_as_str= (*format == 'u') ?
my_safe_utoa(base, uval, &buff[sizeof(buff)-1]) :
my_safe_itoa(base, ival, &buff[sizeof(buff)-1]);
/* Strip off "ffffffff" if we have 'x' format without 'll' */
if (*format == 'x' && !have_longlong && ival < 0)
val_as_str+= 8;
while (*val_as_str && to < end)
*to++= *val_as_str++;
continue;
}
}
case 's':
{
const char *val= va_arg(ap, char*);
if (!val)
val= "(null)";
while (*val && to < end)
*to++= *val++;
continue;
}
}
}
*to= 0;
return to - start;
}
size_t my_safe_snprintf(char* to, size_t n, const char* fmt, ...)
{
size_t result;
va_list args;
va_start(args,fmt);
result= my_safe_vsnprintf(to, n, fmt, args);
va_end(args);
return result;
}
size_t my_safe_printf_stderr(const char* fmt, ...)
......@@ -972,7 +794,7 @@ size_t my_safe_printf_stderr(const char* fmt, ...)
size_t result;
va_list args;
va_start(args,fmt);
result= my_safe_vsnprintf(to, sizeof(to), fmt, args);
result= vsnprintf(to, sizeof(to), fmt, args);
va_end(args);
my_write_stderr(to, result);
return result;
......
sql/signal_handler.cc
View file @ e09767cd
......@@ -72,7 +72,7 @@ extern "C" sig_handler handle_fatal_signal(int sig)
curr_time= my_time(0);
localtime_r(&curr_time, &tm);
fprintf(stderr, "%02d%02d%02d %2d:%02d:%02d ",
my_safe_printf_stderr("%02d%02d%02d %2d:%02d:%02d ",
tm.tm_year % 100, tm.tm_mon+1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
if (opt_expect_abort
......
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