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3.11.c
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3.11.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
int main(int argc, char *argv[])
{
int val;
if(argc != 2)
{
printf("usage: 3.11 <descriptor#>");
return 1;
}
if( (val = fcntl(atoi(argv[1]), F_GETFL, 0)) < 0)
{
printf("fcntl error!\n");
return 1;
}
switch (val & O_ACCMODE) {
case O_RDONLY:
printf("read only");
break;
case O_WRONLY:
printf("write only");
break;
case O_RDWR:
printf("read write");
break;
default:
printf("unknown access mode");
return 1;
}
if(val & O_APPEND)
printf(", append");
if(val & O_NONBLOCK)
printf(", nonblocking");
if(val & O_SYNC)
printf(", synchronous writes");
putchar('\n');
return 0;
}