#include "user_util.h"
#include "kern_util.h"
#include "net_user.h"
-#include "helper.h"
#include "os.h"
int tap_open_common(void *dev, char *gate_addr)
return(0);
}
-void tap_check_ips(char *gate_addr, char *eth_addr)
+void tap_check_ips(char *gate_addr, unsigned char *eth_addr)
{
int tap_addr[4];
}
}
+/* Do reliable error handling as this fails frequently enough. */
void read_output(int fd, char *output, int len)
{
- int remain, n, actual;
+ int remain, ret, expected;
char c;
+ char *str;
if(output == NULL){
output = &c;
}
*output = '\0';
- n = os_read_file(fd, &remain, sizeof(remain));
- if(n != sizeof(remain)){
- printk("read_output - read of length failed, err = %d\n", -n);
- return;
+ ret = os_read_file(fd, &remain, sizeof(remain));
+
+ if (ret != sizeof(remain)) {
+ expected = sizeof(remain);
+ str = "length";
+ goto err;
}
while(remain != 0){
- n = (remain < len) ? remain : len;
- actual = os_read_file(fd, output, n);
- if(actual != n){
- printk("read_output - read of data failed, "
- "err = %d\n", -actual);
- return;
+ expected = (remain < len) ? remain : len;
+ ret = os_read_file(fd, output, expected);
+ if (ret != expected) {
+ str = "data";
+ goto err;
}
- remain -= actual;
+ remain -= ret;
}
+
return;
+
+err:
+ if (ret < 0)
+ printk("read_output - read of %s failed, errno = %d\n", str, -ret);
+ else
+ printk("read_output - read of %s failed, read only %d of %d bytes\n", str, ret, expected);
}
int net_read(int fd, void *buf, int len)
pe_data.stdout = fds[1];
pid = run_helper(change_pre_exec, &pe_data, argv, NULL);
+ if (pid > 0) /* Avoid hang as we won't get data in failure case. */
+ read_output(fds[0], output, output_len);
+
+ os_close_file(fds[0]);
os_close_file(fds[1]);
- read_output(fds[0], output, output_len);
- CATCH_EINTR(err = waitpid(pid, NULL, 0));
+ if (pid > 0)
+ CATCH_EINTR(err = waitpid(pid, NULL, 0));
return(pid);
}