static int wpMode ;
char *usage = "Usage: gpio -v\n"
+ " gpio -h\n"
" gpio [-g] <read/write/pwm/mode> ...\n"
" gpio [-p] <read/write/mode> ...\n"
" gpio export/edge/unexport/unexportall/exports ...\n"
" gpio load spi/i2c" ;
-
/*
* changeOwner:
* Change the ownership of the file to the real userId of the calling
*********************************************************************************
*/
-void doExports (void)
+static void doExports (int argc, char *argv [])
{
int fd ;
int i, l, first ;
int pin ;
char *mode ;
char fName [128] ;
- uid_t uid ;
- gid_t gid ;
if (argc != 4)
{
exit (1) ;
}
- pin = atoi (argv [2]) ;
-
+ pin = atoi (argv [2]) ;
mode = argv [3] ;
// Export the pin and set direction to input
exit (1) ;
}
- /**/ if (strcasecmp (mode, "none") == 0)
- fprintf (fd, "none\n") ;
- else if (strcasecmp (mode, "rising") == 0)
- fprintf (fd, "rising\n") ;
- else if (strcasecmp (mode, "falling") == 0)
- fprintf (fd, "falling\n") ;
- else if (strcasecmp (mode, "both") == 0)
- fprintf (fd, "both\n") ;
+ /**/ if (strcasecmp (mode, "none") == 0) fprintf (fd, "none\n") ;
+ else if (strcasecmp (mode, "rising") == 0) fprintf (fd, "rising\n") ;
+ else if (strcasecmp (mode, "falling") == 0) fprintf (fd, "falling\n") ;
+ else if (strcasecmp (mode, "both") == 0) fprintf (fd, "both\n") ;
else
{
fprintf (stderr, "%s: Invalid mode: %s. Should be none, rising, falling or both\n", argv [1], mode) ;
exit (1) ;
}
-// Change ownership so the current user can actually use it!
-
- uid = getuid () ;
- gid = getgid () ;
+// Change ownership of the value and edge files, so the current user can actually use it!
sprintf (fName, "/sys/class/gpio/gpio%d/value", pin) ;
- if (chown (fName, uid, gid) != 0)
- {
- fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
- exit (1) ;
- }
-
-// Also change ownership of the edge file
+ changeOwner (argv [0], fName) ;
sprintf (fName, "/sys/class/gpio/gpio%d/edge", pin) ;
- if (chown (fName, uid, gid) != 0)
- {
- fprintf (stderr, "%s: Unable to change ownership of the value file: %s\n", argv [1], strerror (errno)) ;
- exit (1) ;
- }
+ changeOwner (argv [0], fName) ;
fclose (fd) ;
}
mode = argv [3] ;
- /**/ if (strcasecmp (mode, "in") == 0)
- pinMode (pin, INPUT) ;
- else if (strcasecmp (mode, "out") == 0)
- pinMode (pin, OUTPUT) ;
- else if (strcasecmp (mode, "pwm") == 0)
- pinMode (pin, PWM_OUTPUT) ;
- else if (strcasecmp (mode, "up") == 0)
- pullUpDnControl (pin, PUD_UP) ;
- else if (strcasecmp (mode, "down") == 0)
- pullUpDnControl (pin, PUD_DOWN) ;
- else if (strcasecmp (mode, "tri") == 0)
- pullUpDnControl (pin, PUD_OFF) ;
+ /**/ if (strcasecmp (mode, "in") == 0) pinMode (pin, INPUT) ;
+ else if (strcasecmp (mode, "out") == 0) pinMode (pin, OUTPUT) ;
+ else if (strcasecmp (mode, "pwm") == 0) pinMode (pin, PWM_OUTPUT) ;
+ else if (strcasecmp (mode, "up") == 0) pullUpDnControl (pin, PUD_UP) ;
+ else if (strcasecmp (mode, "down") == 0) pullUpDnControl (pin, PUD_DOWN) ;
+ else if (strcasecmp (mode, "tri") == 0) pullUpDnControl (pin, PUD_OFF) ;
else
{
fprintf (stderr, "%s: Invalid mode: %s. Should be in/out/pwm/up/down/tri\n", argv [1], mode) ;
return 1 ;
}
+ if (strcasecmp (argv [1], "-h") == 0)
+ {
+ printf ("%s: %s\n", argv [0], usage) ;
+ return 0 ;
+ }
+
if (strcasecmp (argv [1], "-v") == 0)
{
printf ("gpio version: %s\n", VERSION) ;
// Initial test for /sys/class/gpio operations:
- /**/ if (strcasecmp (argv [1], "exports" ) == 0) { doExports () ; return 0 ; }
- else if (strcasecmp (argv [1], "export" ) == 0) { doExport (argc, argv) ; return 0 ; }
- else if (strcasecmp (argv [1], "edge" ) == 0) { doEdge (argc, argv) ; return 0 ; }
+ /**/ if (strcasecmp (argv [1], "exports" ) == 0) { doExports (argc, argv) ; return 0 ; }
+ else if (strcasecmp (argv [1], "export" ) == 0) { doExport (argc, argv) ; return 0 ; }
+ else if (strcasecmp (argv [1], "edge" ) == 0) { doEdge (argc, argv) ; return 0 ; }
else if (strcasecmp (argv [1], "unexportall") == 0) { doUnexportall (argc, argv) ; return 0 ; }
- else if (strcasecmp (argv [1], "unexport" ) == 0) { doUnexport (argc, argv) ; return 0 ; }
- else if (strcasecmp (argv [1], "load" ) == 0) { doLoad (argc, argv) ; return 0 ; }
+ else if (strcasecmp (argv [1], "unexport" ) == 0) { doUnexport (argc, argv) ; return 0 ; }
+
+// Check for drive or load commands:
+
+ if (strcasecmp (argv [1], "drive") == 0) { doPadDrive (argc, argv) ; return 0 ; }
+ if (strcasecmp (argv [1], "load" ) == 0) { doLoad (argc, argv) ; return 0 ; }
// Check for -g argument
{
if (wiringPiSetupGpio () == -1)
{
- fprintf (stderr, "%s: Unable to initialise GPIO in GPIO mode.\n", argv [0]) ;
+ fprintf (stderr, "%s: Unable to initialise GPIO mode.\n", argv [0]) ;
exit (1) ;
}
{
if (wiringPiSetup () == -1)
{
- fprintf (stderr, "%s: Unable to initialise GPIO in wiringPi mode\n", argv [0]) ;
+ fprintf (stderr, "%s: Unable to initialise wiringPi mode\n", argv [0]) ;
exit (1) ;
}
wpMode = WPI_MODE_PINS ;
// Check for wiring commands
- /**/ if (strcasecmp (argv [1], "write" ) == 0)
- doWrite (argc, argv) ;
- else if (strcasecmp (argv [1], "read" ) == 0)
- doRead (argc, argv) ;
- else if (strcasecmp (argv [1], "mode" ) == 0)
- doMode (argc, argv) ;
- else if (strcasecmp (argv [1], "pwm" ) == 0)
- doPwm (argc, argv) ;
- else if (strcasecmp (argv [1], "drive" ) == 0)
- doPadDrive (argc, argv) ;
+ /**/ if (strcasecmp (argv [1], "read" ) == 0) doRead (argc, argv) ;
+ else if (strcasecmp (argv [1], "write") == 0) doWrite (argc, argv) ;
+ else if (strcasecmp (argv [1], "pwm" ) == 0) doPwm (argc, argv) ;
+ else if (strcasecmp (argv [1], "mode" ) == 0) doMode (argc, argv) ;
else
{
- fprintf (stderr, "%s: Unknown command: %s. (read/write/pwm/mode/drive expected)\n", argv [0], argv [1]) ;
+ fprintf (stderr, "%s: Unknown command: %s.\n", argv [0], argv [1]) ;
exit (1) ;
}
return 0 ;