kk Blog —— 通用基础

diff --git a/tools/debugedit.c b/tools/debugedit.c
index 0f85885..257f5f8 100644
--- a/tools/debugedit.c
+++ b/tools/debugedit.c
@@ -602,13 +602,14 @@ edit_dwarf2_line (DSO *dso, uint32_t off, char *comp_dir, int phase)
    if (base_dir == NULL)
      p = s;
    else if (has_prefix (s, base_dir))
-     p = s + strlen (base_dir);
+     { p = s + strlen (base_dir); while (*p == '/') p++; }
    else if (has_prefix (s, dest_dir))
-     p = s + strlen (dest_dir);
+     { p = s + strlen (dest_dir); while (*p == '/') p++; }
 
-   if (p)
+   if (p && strlen (p) > 2 && flock(list_file_fd, LOCK_EX) == 0)
      {
        size_t size = strlen (p) + 1;
+     
        while (size > 0)
      {
        ssize_t ret = write (list_file_fd, p, size);
@@ -617,6 +618,7 @@ edit_dwarf2_line (DSO *dso, uint32_t off, char *comp_dir, int phase)
        size -= ret;
        p += ret;
      }
+     flock(list_file_fd, LOCK_UN);
      }
  }
 
@@ -928,17 +930,18 @@ edit_attributes (DSO *dso, unsigned char *ptr, struct abbrev_tag *t, int phase)
      it and the debugger (GDB) cannot safely optimize out the missing
      CU current dir subdirectories.  */
   if (comp_dir && list_file_fd != -1)
-    {
+  {
       char *p;
       size_t size;
 
       if (base_dir && has_prefix (comp_dir, base_dir))
- p = comp_dir + strlen (base_dir);
+     { p = comp_dir + strlen (base_dir); while (*p == '/') p++; }
       else if (dest_dir && has_prefix (comp_dir, dest_dir))
- p = comp_dir + strlen (dest_dir);
+     { p = comp_dir + strlen (dest_dir); while (*p == '/') p++; }
       else
  p = comp_dir;
 
+    if (p && strlen (p) > 2 && flock(list_file_fd, LOCK_EX) == 0) {
       size = strlen (p) + 1;
       while (size > 0)
  {
@@ -949,6 +952,8 @@ edit_attributes (DSO *dso, unsigned char *ptr, struct abbrev_tag *t, int phase)
    p += ret;
  }
     }
+    flock(list_file_fd, LOCK_UN);
+  }
 
   if (found_list_offs && comp_dir)
     edit_dwarf2_line (dso, list_offs, comp_dir, phase);
@@ -1548,7 +1553,7 @@ main (int argc, char *argv[])
     canonicalize_path(dest_dir, dest_dir);
 
   /* Make sure there are trailing slashes in dirs */
-  if (base_dir != NULL && base_dir[strlen (base_dir)-1] != '/')
+  /*if (base_dir != NULL && base_dir[strlen (base_dir)-1] != '/')
     {
       p = malloc (strlen (base_dir) + 2);
       strcpy (p, base_dir);
@@ -1563,7 +1568,7 @@ main (int argc, char *argv[])
       strcat (p, "/");
       free (dest_dir);
       dest_dir = p;
-    }
+    }*/
 
   if (list_file != NULL)
     {

# 先建立fd
tmp_fifo="/tmp/.tmp_fifo"

mkfifo $tmp_fifo
exec 6<>$tmp_fifo
rm $tmp_fifo

# 假设8进程，先往fd中写入8字节
forks=8
for ((i=0;i<$forks;i++))
do  
	echo >&6 
done

# Strip ELF binaries
find "$RPM_BUILD_ROOT" ! -path "${debugdir}/*.debug" -type f \
               \( -perm -0100 -or -perm -0010 -or -perm -0001 \) \
		     -print |
file -N -f - | sed -n -e 's/^\(.*\):[     ]*.*ELF.*, not stripped/\1/p' |
xargs --no-run-if-empty stat -c '%h %D_%i %n' |
while read nlinks inum f; do
  get_debugfn "$f"
  [ -f "${debugfn}" ] && continue

  # If this file has multiple links, keep track and make
  # the corresponding .debug files all links to one file too.
  if [ $nlinks -gt 1 ]; then
    eval linked=\$linked_$inum
    if [ -n "$linked" ]; then
      link=$debugfn
      get_debugfn "$linked"
      echo "hard linked $link to $debugfn"
      ln -nf "$debugfn" "$link"
      continue
    else
      eval linked_$inum=\$f
      echo "file $f has $[$nlinks - 1] other hard links"
    fi
  fi

  # 从fd读取一个字节，开始一个进程
  read -u6
  {
    echo "extracting debug info from $f"
    id=$(/usr/lib/rpm/debugedit_kk -b "$RPM_BUILD_DIR" -d "/usr/src/debug$REPLACE_COMP_DIR" \
			      -i -l "$SOURCEFILE" "$f")
    if $strict && [ -z "$id" ]; then
      echo >&2 "*** ${strict_error}: No build ID note found in $f"
      $strict && exit 2   # 需要先写回一个字节？？？
    fi

    # A binary already copied into /usr/lib/debug doesn't get stripped,
    # just has its file names collected and adjusted.
    case "$dn" in
    /usr/lib/debug/*)
      [ -z "$id" ] || make_id_link "$id" "$dn/$(basename $f)"
      continue ;;  # 需要先写回一个字节？？？
    esac

    mkdir -p "${debugdn}"
    if test -w "$f"; then
      strip_to_debug "${debugfn}" "$f"
    else
      chmod u+w "$f"
      strip_to_debug "${debugfn}" "$f"
      chmod u-w "$f"
    fi

    if [ -n "$id" ]; then
      make_id_link "$id" "$dn/$(basename $f)"
      make_id_link "$id" "/usr/lib/debug$dn/$bn" .debug
    fi

    echo >&6 # 一个进程结束写回一个字节
    exit 0   # 退出子进程
  } &
done || exit

wait # 等待所有子进程结束
exec 6>&-  # 删除fd

#!/bin/sh
for ((i=1;i<10;i++))
do
{
	echo "run $i "`date +%s`
	sleep $i
	echo "end $i "`date +%s`
	exit 0
} &
done
wait

#!/bin/sh
forks=3
n=0
for ((i=1;i<10;i++))
do
{
	{
		echo "run $i "`date +%s`
		sleep $i
		echo "end $i "`date +%s`
		exit 0
	} &
	let n=$n+1
	if [ $n -eq $forks ]; then
		wait
		n=0
	fi
}
done
wait

#!/bin/sh

tmp_fifo="/tmp/.tmp_fifo"

mkfifo $tmp_fifo
exec 6<>$tmp_fifo
rm $tmp_fifo

forks=3
for ((i=0;i<$forks;i++))
do
	echo >&6
done

for ((i=1;i<10;i++))
do
	read -u6
	{
		echo "run $i "`date +%s`
		sleep $i
		echo "end $i "`date +%s`
		echo >&6
		exit 0
	} &
done
wait

exec 6>&-

exit 0

Error: <stdin>: syntax error in line 4 near ';'

echo "digraph fullgraph {" > full.graph
echo "node [ fontname=Helvetica, fontsize=12 ];" >> full.graph

find . -name '*.c.cdepn' -exec cat {} \; | \
	awk -F"[ {}]+" '{
		if ($1 == "F") {
			print "\""$2 "\" [label=\"" $2 "\\n" $3 ":\"];"
		} else if ($1 == "C") {
			print "\"" $2 "\" -> \"" $4 "\" [label=\"" $3 "\"];"
		}
	}' \
| sort | uniq -u >> full.graph

echo "}" >> full.graph

sudo apt-get install graphviz

yum install graphviz

wget http://www.graphviz.org/graphviz-rhel.repo
cp graphviz-rhel.repo /etc/yum.repos.d/
yum list available 'graphviz*'
yum install 'graphviz*'

yum -y install glibc-devel glibc-devel.i686/i386

There is no layout engine support for "dot".
Perhaps "dot -c" needs to be run (with installer's privileges) to register the plugins?

$ /usr/local/gccgraph/bin/gcc test.c

$ genfull

$ gengraph

// test.c
#include <stdio.h>

void test3()
{
}
void test2()
{
	test3();
}

void test1()
{
}

int main()
{
	test1();
	test2();
	return 0;
}

-f：指定顶级函数，即入口函数，如main等（当然不限定是main了）；
-o：指定输出的postfile文件名，不指定的话就是函数名了，如上面的main；
--output-type：指定输出类型，例如png、gif、html和ps，缺省是ps，如上面的main.ps；
-d：指定最大调用层数；
-s：仅仅显示指定的函数，而不对其调用进行展开；
-i：忽略指定的函数
-t：忽略Linux特有的内核函数集；
-k：保留由-s忽略的内部细节形成的中间文件，为sub.graph

gengraph --output-type "png" -f main

genfull -s "mm include/linux drivers/block arch/i386"

gengraph -p -g linux-2.6.25/full.graph

gengraph -q -t -d 2 -f alloc_pages

echo QUIT > /tmpcodeviz.pipe

gengraph --output-type gif -f main

gengraph --output-type gif -f main -s OSInit

gengraph --output-type gif -f main -s OSInit -i "OSCPUSaveSR;OSCPURestoreSR"

gengraph --output-type gif -f main -s "OSInit;OSSemCreate" -i "OSCPUSaveSR;OSCPURestoreSR" -k

dot -Tgif -o main.gif sub.graph

gengraph --output-type gif -r -f OSTimeDly

gengraph --output-type gif -d 1 -f Task

gcc configure: error: Building GCC requires GMP 4.2+, MPFR 2.3.1+ and MPC 0.8.0+

安装gmp:  ./configure --prefix=/usr/local/gmp-4.3.2; make install
安装mpfr: ./configure --prefix=/usr/local/mpfr-2.4.2 --with-gmp=/usr/local/gmp-4.3.2/; make install
安装mpc:  ./configure --prefix=/usr/local/mpc-0.8.1 --with-gmp=/usr/local/gmp-4.3.2/ --with-mpfr=/usr/local/mpfr-2.4.2/; make install

指定安装：export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/gmp-4.3.2/lib:/usr/local/mpfr-2.4.2/lib:/usr/local/mpc-0.8.1/lib

默认安装：$export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib

#!/bin/sh

# Download some prerequisites needed by gcc.
# Run this from the top level of the gcc source tree and the gcc
# build will do the right thing.
#
# (C) 2010 Free Software Foundation
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see http://www.gnu.org/licenses/.

MPFR=mpfr-2.4.2
GMP=gmp-4.3.2
MPC=mpc-0.8.1

wget ftp://gcc.gnu.org/pub/gcc/infrastructure/$MPFR.tar.bz2 || exit 1
tar xjf $MPFR.tar.bz2 || exit 1
ln -sf $MPFR mpfr || exit 1

wget ftp://gcc.gnu.org/pub/gcc/infrastructure/$GMP.tar.bz2 || exit 1
tar xjf $GMP.tar.bz2  || exit 1
ln -sf $GMP gmp || exit 1

wget ftp://gcc.gnu.org/pub/gcc/infrastructure/$MPC.tar.gz || exit 1
tar xzf $MPC.tar.gz || exit 1
ln -sf $MPC mpc || exit 1

rm $MPFR.tar.bz2 $GMP.tar.bz2 $MPC.tar.gz || exit 1

sudo apt-get install m4

#export C_INCLUDE_PATH=/usr/include/i386-linux-gnu && export CPLUS_INCLUDE_PATH=$C_INCLUDE_PATH

#export LIBRARY_PATH=/usr/lib/i386-linux-gnu

static _Unwind_Reason_Code
uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
	struct dwarf_fde *fde;
	struct dwarf_cie *cie;
	const unsigned char *aug, *insn, *end;

	memset (fs, 0, sizeof (*fs));
	context->args_size = 0;
	context->lsda = 0;

	fde = _Unwind_Find_FDE (context->ra - 1, &context->bases); //这里返回了NULL
	if (fde == NULL)
	{
		/* Couldn't find frame unwind info for this function.  Try a
		 * target-specific fallback mechanism.  This will necessarily
		 * not profide a personality routine or LSDA.  */
#ifdef MD_FALLBACK_FRAME_STATE_FOR
		MD_FALLBACK_FRAME_STATE_FOR (context, fs, success); // 出错的地方
		return _URC_END_OF_STACK;
	success:
		return _URC_NO_REASON;
#else
		return _URC_END_OF_STACK;  //出错返回
#endif
	}
	.....
}

MD_FALLBACK_FRAME_STATE_FOR (context, fs, success);

// MD_FALLBACK_FRAME_STATE_FOR (context, fs, success); // 出错的地方
// return _URC_END_OF_STACK;

sed ':a;N;$!ba;s/\n//g' file.txt

sed [-nefri] 'command' 输入文本        

-n ∶使用安静(silent)模式。在一般 sed 的用法中，所有来自 STDIN的资料一般都会被列出到萤幕上。但如果加上 -n 参数后，则只有经过sed 特殊处理的那一行(或者动作)才会被列出来。
-e ∶直接在指令列模式上进行 sed 的动作编辑；
-f ∶直接将 sed 的动作写在一个档案内， -f filename 则可以执行 filename 内的sed 动作；
-r ∶sed 的动作支援的是延伸型正规表示法的语法。(预设是基础正规表示法语法)
-i ∶直接修改读取的档案内容，而不是由萤幕输出。       

a  ∶新增， a 的后面可以接字串，而这些字串会在新的一行出现(目前的下一行)～
c  ∶取代， c 的后面可以接字串，这些字串可以取代 n1,n2 之间的行！
d  ∶删除，因为是删除啊，所以 d 后面通常不接任何咚咚；
i  ∶插入， i 的后面可以接字串，而这些字串会在新的一行出现(目前的上一行)；
p  ∶列印，亦即将某个选择的资料印出。通常 p 会与参数 sed -n 一起运作～
s  ∶取代，可以直接进行取代的工作哩！通常这个 s 的动作可以搭配正规表示法！例如 1,20s/old/new/g 就是啦！

删除某行
sed '1d' ab             #删除第一行 
sed '$d' ab             #删除最后一行
sed '1,2d' ab           #删除第一行到第二行
sed '2,$d' ab           #删除第二行到最后一行

显示某行
sed -n '1p' ab          #显示第一行 
sed -n '$p' ab          #显示最后一行
sed -n '1,2p' ab        #显示第一行到第二行
sed -n '2,$p' ab        #显示第二行到最后一行

使用模式进行查询
sed -n '/ruby/p' ab     #查询包括关键字ruby所在所有行
sed -n '/\$/p' ab       #查询包括关键字$所在所有行，使用反斜线\屏蔽特殊含义

增加一行或多行字符串
sed '1a drink tea' ab   #第一行后增加字符串"drink tea"
sed '1,3a drink tea' ab #第一行到第三行后增加字符串"drink tea"
sed '1a drink tea\nor coffee' ab   #第一行后增加多行，使用换行符\n

代替一行或多行
sed '1c Hi' ab          #第一行代替为Hi
sed '1,2c Hi' ab        #第一行到第二行代替为Hi

替换一行中的某部分
格式：sed 's/要替换的字符串/新的字符串/g'   （要替换的字符串可以用正则表达式）
sed -n '/ruby/p' ab | sed 's/ruby/bird/g'    #替换ruby为bird
sed -n '/ruby/p' ab | sed 's/ruby//g'        #删除ruby

插入
sed -i '$a bye' ab         #在文件ab中最后一行直接输入"bye"
cat ab

删除匹配行
sed -i '/匹配字符串/d'  filename  （注：若匹配字符串是变量，则需要“”，而不是‘’。记得好像是）

替换匹配行中的某个字符串
sed -i '/匹配字符串/s/替换源字符串/替换目标字符串/g' filename

awk 'BEGIN { sum+=$1; } END { print sum }'

awk -F '[ ;]+' '{print $2}'

last -n 5 | awk  '{print $1}'
cat /etc/passwd |awk  -F ':'  '{print $1"\t"$7}'
cat /etc/passwd |awk  -F ':'  'BEGIN {print "name,shell"}  {print $1","$7} END {print "blue,/bin/nosh"}'

ARGC            命令行参数个数
ARGV            命令行参数排列
ENVIRON         支持队列中系统环境变量的使用
FILENAME        awk浏览的文件名
FNR             浏览文件的记录数
FS              设置输入域分隔符，等价于命令行 -F选项
NF              浏览记录的域的个数
NR              已读的记录数
OFS             输出域分隔符
ORS             输出记录分隔符
RS              控制记录分隔符

# 统计/etc/passwd的账户人数
awk '{count++;print $0;} END{print "user count is ", count}' /etc/passwd

if (expression) {
	statement;
	statement;
	... ...
}

if (expression) {
	statement;
} else {
	statement2;
}

if (expression) {
	statement1;
} else if (expression1) {
	statement2;
} else {
	statement3;
}

awk -F ':' 'BEGIN {count=0;} {name[count] = $1;count++;}; END{for (i = 0; i < NR; i++) print i, name[i]}' /etc/passwd
0 root
1 daemon
2 bin
3 sys
4 sync
5 games
......