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/* Check if file descriptors are open or not */
#include <stdio.h>
#include <stdlib.h>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <wtypes.h>
#include <winbase.h>
#include <winerror.h>
void process_fd(char * s)
{
int fd;
HANDLE h;
DWORD flags;
h = (HANDLE) atoi(s);
if (GetHandleInformation(h, &flags)) {
printf("open\n");
} else if (GetLastError() == ERROR_INVALID_HANDLE) {
printf("closed\n");
} else {
printf("error %d\n", GetLastError());
}
}
#else
#include <limits.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
void process_fd(char * s)
{
long n;
int fd;
char * endp;
struct stat st;
n = strtol(s, &endp, 0);
if (*endp != 0 || n < 0 || n > (long) INT_MAX) {
printf("parsing error\n");
return;
}
fd = (int) n;
if (fstat(fd, &st) != -1) {
printf("open\n");
} else if (errno == EBADF) {
printf("closed\n");
} else {
printf("error %s\n", strerror(errno));
}
}
#endif
int main(int argc, char ** argv)
{
int i;
for (i = 1; i < argc; i++) {
printf("#%d: ", i);
process_fd(argv[i]);
}
return 0;
}
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