gdb set arguments プログラム引数の入力

# gdb testmain

# gdb break main

Breakpoint 1 at 0x4005d2: file ../src/testmain.c, line 12.

プログラムへの引数は以下のコマンドで入力できる。

(gdb) set args "abc" 100

(gdb) run

Starting program: /work/obj/testmain "abc" 100

Breakpoint 1, main (argc=3, argv=0x7fffffffe448) at ../src/testmain.c:12

12        char* rc = getConst();

Missing separate debuginfos, use: yum debuginfo-install glibc-2.28-225.el8_8.6.x8-8.5.0-10.1.el8_6.x86_64 libstdc++-8.5.0-10.1.el8_6.x86_64

(gdb) show args

Argument list to give program being debugged when it is started is ""abc" 100".

(gdb) info args

argc = 3

argv = 0x7fffffffe448

(gdb) p argv[0]

$2 = 0x7fffffffe6cb "/work/obj/testmain"

(gdb) p argv[1]

$3 = 0x7fffffffe6ed "abc"

(gdb) p argv[2]

$4 = 0x7fffffffe6f1 "100"

(gdb) c

Continuing.

rc=RC_0001

args[0]=/work/obj/testmain agrv[1]=abc argv[2]=100

[Inferior 1 (process 2458121) exited normally]

(gdb) Quit

ソースコードは以下。

# cat testmain.c

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define CONST_RC "RC_0001"

char* getConst() {

  return (char*)CONST_RC;

}

int main(int argc, char *argv[]) {

  char* rc = getConst();

  printf("rc=%s\n",rc);

  if (argc > 2) {

    printf("args[0]=%s agrv[1]=%s argv[2]=%s\n",argv[0],argv[1],argv[2]);

  }

  return 0;

}

makefileは以下。

# cat testmain.mk

SRCDIR     = ../src

OBJDIR     = ../obj

TARGETDIR  = ../lib

TARGETSRC  = $(SRCDIR)/testmain.c

TARGETOBJ  = $(OBJDIR)/testmain.o

TARGETEXE  = $(OBJDIR)/testmain

CC         = g++

CCOPTIONS  = -c -g3 -O0 -fPIC -Wno-deprecated -m64 -mtune=generic -mcmodel=small

LIBCC      = $(CC)

LDOPTIONS  = -m64

.SUFFIXES: .c .o

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

# rules

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

all: $(TARGETEXE)

$(TARGETEXE): $(TARGETOBJ)

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

$(TARGETOBJ): $(TARGETSRC)

        $(CC) $(CCOPTIONS) $(TARGETSRC) -o $(TARGETOBJ)

clean:

        @rm -f $(TARGETOBJ) $(TARGETEXE)

install:

        @cp -p $(TARGETEXE) $(TARGETDIR)