gcc compiling (systems call- soft' variable syntax

Hi,
Could you please help me with the corect syntax for soft' variable with open system call?

Code:

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif


#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>  //used for exit()
#include <string.h>

#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <error.h>


//prototypes


/*******************************************************************************/
int main()
{
    int fd,length=0;
    int size;
    char read_buffer[80];
    char write_buffer[]="dddddddddddddddddddddddddddddddddd";
    path=//Home_work//My_solution//a.txt;
    //open the file, if it doesn't exist create it with the following permission access
    fd = open ("$path",/* O_RDONLY */ O_WRONLY  |O_CREAT,0666);
    if (fd == -1) 
    {
        /* The open failed. Print an error message and exit. */
        printf("error opening file: \n");
        exit(-1);
    }
    /* Read the size of the data in the  file. */
    length = read (fd, read_buffer, sizeof (read_buffer));
    size=sizeof(read_buffer);
    printf("sizeof(read_buffer)=%d\n",size);
    printf("length=%d\n",length);
    printf("fd =%d\n read_buffer= %s\n ",fd ,read_buffer);

    
    length = write (fd, write_buffer, strlen (write_buffer));
    printf("length=%d\n",length);
        printf("write_buffer =%s\n",write_buffer);
        printf("fd =%d\n",fd);
    // Close the file descriptor, 
    close (fd);
         
        
}

getenv - C++ Reference

I think that's what you're looking for but your description of your problem wasn't optimal so I'm not sure.

Syntax like "$path" does not make sense in C. You probably mean to do

Code:

#define PATH "/Home_work/My_solution/a.txt"
fd = open (PATH, O_WRONLY  |O_CREAT,0666);

Also, you are trying to read from that file descriptor even though you specified O_WRONLY. You probably want to open two file descriptors, one for reading and one for writing.

thanks