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Log a specific error when serial opens fail due to lack of user permissions

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This commit is contained in:
Luke Dashjr 2012-06-26 04:14:57 +00:00
parent d3fa59d76f
commit f8774ff611
1 changed files with 18 additions and 0 deletions
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18
fpgautils.c
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@ -15,6 +15,7 @@
#include <string.h>
#ifndef WIN32
#include <errno.h>
#include <termios.h>
#include <sys/stat.h>
#include <unistd.h>
@ -157,7 +158,20 @@ serial_open(const char*devpath, unsigned long baud, signed short timeout, bool p
#ifdef WIN32
HANDLE hSerial = CreateFile(devpath, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (unlikely(hSerial == INVALID_HANDLE_VALUE))
{
DWORD e = GetLastError();
switch (e) {
case ERROR_ACCESS_DENIED:
applog(LOG_ERR, "Do not have user privileges required to open %s", devpath);
break;
case ERROR_SHARING_VIOLATION:
applog(LOG_ERR, "%s is already in use by another process", devpath);
break;
default:
break;
}
return -1;
}
// thanks to af_newbie for pointers about this
COMMCONFIG comCfg = {0};
@ -188,7 +202,11 @@ serial_open(const char*devpath, unsigned long baud, signed short timeout, bool p
int fdDev = open(devpath, O_RDWR | O_CLOEXEC | O_NOCTTY);
if (unlikely(fdDev == -1))
{
if (errno == EACCES)
applog(LOG_ERR, "Do not have user privileges required to open %s", devpath);
return -1;
}
struct termios pattr;
tcgetattr(fdDev, &pattr);