hush: add leak detector helper; fix/add tests for it

function                                             old     new   delta
builtin_memleak                                        -      92     +92
bltins                                               288     300     +12
This commit is contained in:
Denis Vlasenko 2009-04-08 11:48:57 +00:00
parent 3dfb035d8d
commit c73b70c701
7 changed files with 126 additions and 133 deletions

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@ -117,7 +117,10 @@
#define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
#endif
/* Keep unconditionally on for now */
/* Enable/disable sanity checks. Ok to enable in production,
* only adds a bit of bloat.
* Keeping unconditionally on for now.
*/
#define HUSH_DEBUG 1
/* In progress... */
#define ENABLE_HUSH_FUNCTIONS 0
@ -524,6 +527,9 @@ struct globals {
char **traps; /* char *traps[NSIG] */
sigset_t blocked_set;
sigset_t inherited_set;
#if HUSH_DEBUG
unsigned long memleak_value;
#endif
char user_input_buf[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
#if ENABLE_FEATURE_SH_STANDALONE
struct nofork_save_area nofork_save;
@ -555,14 +561,17 @@ static int builtin_jobs(char **argv);
#if ENABLE_HUSH_HELP
static int builtin_help(char **argv);
#endif
#if HUSH_DEBUG
static int builtin_memleak(char **argv);
#endif
static int builtin_pwd(char **argv);
static int builtin_read(char **argv);
static int builtin_test(char **argv);
static int builtin_trap(char **argv);
static int builtin_true(char **argv);
static int builtin_set(char **argv);
static int builtin_shift(char **argv);
static int builtin_source(char **argv);
static int builtin_test(char **argv);
static int builtin_trap(char **argv);
static int builtin_true(char **argv);
static int builtin_umask(char **argv);
static int builtin_unset(char **argv);
static int builtin_wait(char **argv);
@ -617,6 +626,9 @@ static const struct built_in_command bltins[] = {
#endif
#if ENABLE_HUSH_JOB
BLTIN("jobs" , builtin_jobs , "List active jobs"),
#endif
#if HUSH_DEBUG
BLTIN("memleak" , builtin_memleak , "Debug tool"),
#endif
BLTIN("pwd" , builtin_pwd , "Print current directory"),
BLTIN("read" , builtin_read , "Input environment variable"),
@ -5962,6 +5974,36 @@ static int builtin_jobs(char **argv UNUSED_PARAM)
}
#endif
#if HUSH_DEBUG
static int builtin_memleak(char **argv UNUSED_PARAM)
{
void *p;
unsigned long l;
/* Crude attempt to find where "free memory" starts,
* sans fragmentation. */
p = malloc(240);
l = (unsigned long)p;
free(p);
p = malloc(3400);
if (l < (unsigned long)p) l = (unsigned long)p;
free(p);
if (!G.memleak_value)
G.memleak_value = l;
l -= G.memleak_value;
if ((long)l < 0)
l = 0;
l /= 1024;
if (l > 127)
l = 127;
/* Exitcode is "how many kilobytes we leaked since 1st call" */
return l;
}
#endif
static int builtin_pwd(char **argv UNUSED_PARAM)
{
puts(set_cwd());

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@ -0,0 +1,3 @@
Warm up
Measuring memory leak...
Ok

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@ -0,0 +1,61 @@
# "Check many leaks" test #1
# Cramming all kinds of weird commands in here.
# As you find leaks, please create separate, small test
# for each leak.
# Narrowing down the leak using this large test may be difficult.
# It is intended to be a blanket "is everything ok?" test
echo "Warm up"
i=1
l=1
t=1
export t
while test $i != 99; do
t=value1_$i; t=value2_$i true; t=value3_$i /bin/true; t=value4_$i exec 1>&1
{ t=value3_$i /bin/true; } </dev/null
if true; t=valueA_$i false >>/dev/null; true; then
: << HERE >/dev/null; true <<HERE
Hello builtin :
HERE
Hello true
HERE
elif false; then
true; echo Doesnt run
else
{ true; }; echo Doesnt run too >>/foo/bar
fi
: $((i++))
done
memleak
echo "Measuring memory leak..."
# Please copy the entire block from above verbatim
i=1
l=1
t=1
export t
while test $i != 99; do
t=value1_$i; t=value2_$i true; t=value3_$i /bin/true; t=value4_$i exec 1>&1
{ t=value3_$i /bin/true; } </dev/null
if true; t=valueA_$i false >>/dev/null; true; then
: << HERE >/dev/null; true <<HERE
Hello builtin :
HERE
Hello true
HERE
elif false; then
true; echo Doesnt run
else
{ true; }; echo Doesnt run too >>/foo/bar
fi
: $((i++))
done
memleak
kb=$?
if test $kb -le 4; then
echo Ok #$kb
else
echo "Bad: $kb kb (or more) leaked"
fi

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@ -1,2 +1,2 @@
Measuring memory leak...
vsz does not grow
Ok

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@ -1,96 +1,4 @@
pid=$$
# Warm up
beg=`ps -o pid,vsz | grep "^ *$pid "`
i=1
while test $i != X; do
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
i=1$i
if test $i = 1111111111111111111111111111111111111111111111; then i=2; fi
if test $i = 1111111111111111111111111111111111111111111112; then i=3; fi
if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
if test $i = 1111111111111111111111111111111111111111111114; then i=5; fi
if test $i = 1111111111111111111111111111111111111111111115; then i=6; fi
if test $i = 1111111111111111111111111111111111111111111116; then i=7; fi
if test $i = 1111111111111111111111111111111111111111111117; then i=8; fi
if test $i = 1111111111111111111111111111111111111111111118; then i=9; fi
if test $i = 1111111111111111111111111111111111111111111119; then i=a; fi
if test $i = 111111111111111111111111111111111111111111111a; then i=b; fi
if test $i = 111111111111111111111111111111111111111111111b; then i=c; fi
if test $i = 111111111111111111111111111111111111111111111c; then i=d; fi
if test $i = 111111111111111111111111111111111111111111111d; then i=e; fi
if test $i = 111111111111111111111111111111111111111111111e; then i=f; fi
if test $i = 111111111111111111111111111111111111111111111f; then i=g; fi
if test $i = 111111111111111111111111111111111111111111111g; then i=h; fi
if test $i = 111111111111111111111111111111111111111111111h; then i=i; fi
if test $i = 111111111111111111111111111111111111111111111i; then i=j; fi
if test $i = 111111111111111111111111111111111111111111111j; then i=X; fi
done
end=`ps -o pid,vsz | grep "^ *$pid "`
# Warm up again (I do need it on my machine)
beg=`ps -o pid,vsz | grep "^ *$pid "`
i=1
while test $i != X; do
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
unset t
t=111111111111111111111111111111111111111111111111111111111111111111111111
export t
i=1$i
if test $i = 1111111111111111111111111111111111111111111111; then i=2; fi
if test $i = 1111111111111111111111111111111111111111111112; then i=3; fi
if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
if test $i = 1111111111111111111111111111111111111111111114; then i=5; fi
if test $i = 1111111111111111111111111111111111111111111115; then i=6; fi
if test $i = 1111111111111111111111111111111111111111111116; then i=7; fi
if test $i = 1111111111111111111111111111111111111111111117; then i=8; fi
if test $i = 1111111111111111111111111111111111111111111118; then i=9; fi
if test $i = 1111111111111111111111111111111111111111111119; then i=a; fi
if test $i = 111111111111111111111111111111111111111111111a; then i=b; fi
if test $i = 111111111111111111111111111111111111111111111b; then i=c; fi
if test $i = 111111111111111111111111111111111111111111111c; then i=d; fi
if test $i = 111111111111111111111111111111111111111111111d; then i=e; fi
if test $i = 111111111111111111111111111111111111111111111e; then i=f; fi
if test $i = 111111111111111111111111111111111111111111111f; then i=g; fi
if test $i = 111111111111111111111111111111111111111111111g; then i=h; fi
if test $i = 111111111111111111111111111111111111111111111h; then i=i; fi
if test $i = 111111111111111111111111111111111111111111111i; then i=j; fi
if test $i = 111111111111111111111111111111111111111111111j; then i=X; fi
done
end=`ps -o pid,vsz | grep "^ *$pid "`
if test "$beg" != "$end"; then
true echo "vsz grows: $beg -> $end"
else
true echo "vsz does not grow"
fi
echo "Measuring memory leak..."
beg=`ps -o pid,vsz | grep "^ *$pid "`
i=1
while test $i != X; do
unset t
@ -128,11 +36,12 @@ while test $i != X; do
if test $i = 111111111111111111111111111111111111111111111h; then i=i; fi
if test $i = 111111111111111111111111111111111111111111111i; then i=j; fi
if test $i = 111111111111111111111111111111111111111111111j; then i=X; fi
memleak
done
end=`ps -o pid,vsz | grep "^ *$pid "`
if test "$beg" != "$end"; then
echo "vsz grows: $beg -> $end"
memleak
kb=$?
if test $kb -le 4; then
echo Ok
else
echo "vsz does not grow"
echo "Bad: $kb kb (or more) leaked"
fi

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@ -1,2 +1,3 @@
Warm up
Measuring memory leak...
vsz does not grow
Ok

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@ -1,10 +1,7 @@
pid=$$
t=1
export t
# Warm up
beg=`ps -o pid,vsz | grep "^ *$pid "`
echo "Warm up"
i=1
while test $i != X; do
t=111111111111111111111111111111111111111111111111111111111111111111111110$i
@ -17,31 +14,10 @@ while test $i != X; do
if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
if test $i = 1111111111111111111111111111111111111111111114; then i=X; fi
done
end=`ps -o pid,vsz | grep "^ *$pid "`
# Warm up again (I do need it on my machine)
beg=`ps -o pid,vsz | grep "^ *$pid "`
i=1
while test $i != X; do
t=111111111111111111111111111111111111111111111111111111111111111111111110$i
t=111111111111111111111111111111111111111111111111111111111111111111111111$i true
t=111111111111111111111111111111111111111111111111111111111111111111111112$i /bin/true
t=111111111111111111111111111111111111111111111111111111111111111111111113$i exec 1>&1
i=1$i
if test $i = 1111111111111111111111111111111111111111111111; then i=2; fi
if test $i = 1111111111111111111111111111111111111111111112; then i=3; fi
if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
if test $i = 1111111111111111111111111111111111111111111114; then i=X; fi
done
end=`ps -o pid,vsz | grep "^ *$pid "`
if test "$beg" != "$end"; then
true echo "vsz grows: $beg -> $end"
else
true echo "vsz does not grow"
fi
memleak
echo "Measuring memory leak..."
beg=`ps -o pid,vsz | grep "^ *$pid "`
i=1
while test $i != X; do
t=111111111111111111111111111111111111111111111111111111111111111111111110$i
@ -54,10 +30,11 @@ while test $i != X; do
if test $i = 1111111111111111111111111111111111111111111113; then i=4; fi
if test $i = 1111111111111111111111111111111111111111111114; then i=X; fi
done
end=`ps -o pid,vsz | grep "^ *$pid "`
if test "$beg" != "$end"; then
echo "vsz grows: $beg -> $end"
memleak
kb=$?
if test $kb -le 4; then
echo Ok
else
echo "vsz does not grow"
echo "Bad: $kb kb (or more) leaked"
fi