Null.cxx

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#include "Devtab.hxx"
 
#include <sys/stat.h>
 
const char *STDIN_DEVICE __attribute__ ((weak)) = "/dev/null";
 
const char *STDOUT_DEVICE __attribute__ ((weak)) = "/dev/null";
 
const char *STDERR_DEVICE __attribute__ ((weak)) = "/dev/null";
 
class Null : public Device
{
public:
    Null(const char* path) : Device(path)
    {
    }
 
    ~Null()
    {
    }
 
    int open(File *, const char *, int, int) OVERRIDE;
    int close(File *) OVERRIDE;
    ssize_t read(File *, void *, size_t) OVERRIDE;
    ssize_t write(File *, const void *, size_t) OVERRIDE;
 
    int fstat(File* file, struct stat *stat) OVERRIDE;
 
};
 
Null null("/dev/null");
 
int Null::open(File* file, const char *path, int flags, int mode)
{    
    return 0;
}
 
int Null::close(File *file)
{    
    return 0;
}
 
ssize_t Null::read(File *file, void *buf, size_t count)
{
    // /dev/null returns EOF when trying to read from it.
    return 0;
}
 
ssize_t Null::write(File *file, const void *buf, size_t count)
{    
    return count;
}
 
int Null::fstat(File* file, struct stat *stat)
{
    memset(stat, 0, sizeof(*stat));
    return 0;
}