RtnWait sleepするshared library for DataStage routine

DataStageジョブのsleepするroutine

routineはDataStageジョブのtransformerから呼び出し変換に使用するが、ジョブの実行時間を恣意的に伸ばしたい場合に使用する。

GNU g++でコンパイル、リンクする。

source code:

/*

* FileName: RtnWait.c

*/

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

char *RtnWait(int interval) {

static char rc[256];

sprintf(rc,"RtnWait was sleeping %d seconds.\n",interval);

int mil = 1000000;

if (interval <= 0) {

sprintf(rc,"RtnWait Interval must be grater than 0.\n",interval);

}

usleep(mil * interval);

return rc;

}

makefile:

SRCDIR = .

OBJDIR = .

TARGETDIR = /usr/local/lib

CODESRC = $(SRCDIR)/RtnWait.c

TARGETOBJ = $(OBJDIR)/RtnWait.o

TARGETLIB = $(TARGETDIR)/libRtnWait.so

CC = g++

CCOPTIONS  = -c -O -fPIC -Wno-deprecated -m64 -mtune=generic -mcmodel=small

LIBCC = $(CC)

LDOPTIONS = -shared -m64

#------------------------------

# Compile Rule

#------------------------------

all: $(TARGETLIB)

$(TARGETLIB): $(TARGETOBJ)

$(LIBCC) $(LDOPTIONS) $(TARGETOBJ) -o $(TARGETLIB)

$(TARGETOBJ): $(CODESRC)

$(CC) $(CCOPTIONS) -c $(CODESRC) -o $(TARGETOBJ)

clean:

    @rm -f $(TARGETOBJ) $(TARGETLIB)

install:

    @cp -p $(TARGETLIB) $(TARGETDIR)

C programからの呼び出し:

test_RtnWait.c

#include <stdio.h>

#include <stdlib.h>

extern char *RtnWait(int interval);

int main()

{

int interval = 10;

char *rc = RtnWait(interval);

printf("Test RtnWait\n");

printf("Input=%d\n",interval);

printf("rc=%s\n",rc);

return 0;

}

test_RtnWait.mk

SRCDIR     = .
OBJDIR     = .
LIBDIR     = .
TARGETDIR  = /usr/local/lib
TARGETLIB  = $(LIBDIR)/test_RtnWait
TARGETOBJ  = $(OBJDIR)/test_RtnWait.o
TARGETSRC  = $(SRCDIR)/test_RtnWait.c
# dynamic link library
# -L$(LOOKUPDIR) -l$(LOOKUPLIB)
LOOKUPDIR = .
LOOKUPLIB =RtnWait
CC = g++
CCOPTIONS = -c -O -fPIC -Wno-deprecated -m64 -mtune=generic -mcmodel=small
LIBCC = $(CC)
LDOPTIONS = -m64
.SUFFIXES: .c .o
# -------------------------------
# rules
# -------------------------------
all: $(TARGETLIB)
$(TARGETLIB): $(TARGETOBJ)
$(LIBCC) $(LDOPTIONS) -L$(LOOKUPDIR) -l$(LOOKUPLIB) $(TARGETOBJ) -o $(TARGETLIB)
$(TARGETOBJ): $(TARGETSRC)
$(CC) $(CCOPTIONS) $(TARGETSRC) -o $(TARGETOBJ)
clean:
@rm -f $(TARGETOBJ) $(TARGETLIB)
install:
@cp -p $(TARGETLIB) $(TARGETDIR)

実行例：

パスが通っていないとエラーが出力される。

# echo $LD_LIBRARY_PATH

# ./test_RtnWait

./test_RtnWait: error while loading shared libraries: libRtnWait.so: cannot open shared object file: No such file or directory

パスを通すと

# export LD_LIBRARY_PATH=/usr/local/lib

# ./test_RtnWait

Test RtnWait

Input=10

rc=RtnWait was sleeping 10 seconds.