Windows の _execvp() の実行サンプル

0000_compile.bat

@set PATH=C:\msys64\mingw64\bin;C:\msys64\usr\local\bin;C:\msys64\usr\bin;C:\msys64\bin;%PATH%
set MSYSTEM=MINGW64

for %%i in (
    inout execvp
) do (
    gcc -g -O2 -Wall -Wextra -o %%i.exe %%i.c
)

pause

0001_exec.bat

@set PATH=C:\msys64\mingw64\bin;C:\msys64\usr\local\bin;C:\msys64\usr\bin;C:\msys64\bin;%PATH%
@set MSYSTEM=MINGW64
@rem gdb execvp.exe

@rem execvp.exe < txtdata_in.txt > txtdata_out1.txt
@rem execvp.exe < txtdata_in.txt > txtdata_out2.txt

cat txtdata_in.txt | execvp.exe > txtdata_out1.txt
cat txtdata_in.txt | execvp.exe > txtdata_out2.txt

@rem cat txtdata_in.txt | execvp.exe | cat
@rem cat txtdata_in.txt | execvp.exe | cat

@rem inout.exe < txtdata_in.txt > txtdata_out.txt

echo ret=%errorlevel%

pause

execvp.c

//#include <stdio.h>
#include <process.h>
#include <unistd.h>

int main(void) {
    const char* args[] = {"inout.exe", NULL};
    
    _execvp("inout.exe", args);
    
    sleep(30);
    
    return 2;
}

inout.c

//#include <stdio.h>
#include <io.h>
#include <unistd.h>

int main(void) {
    char buf[10];
    
    _read(STDIN_FILENO, buf, 1);
    
    sleep(10);
    
    _write(STDOUT_FILENO, buf, 1);
    
    return 4;
}

txtdata_in.txt

abc