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/* usbreset -- send a USB port reset to a USB device
*
* Compile using: gcc -o usbreset usbreset.c
*
*
* */
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>
int main(int argc, char **argv)
{
const char *filename;
int fd;
int rc;
if (argc != 2) {
fprintf(stderr, "Usage: usbreset device-filename\n");
return 1;
}
filename = argv[1];
fd = open(filename, O_WRONLY);
if (fd < 0) {
perror("Error opening output file");
return 1;
}
printf("Resetting USB device %s\n", filename);
rc = ioctl(fd, USBDEVFS_RESET, 0);
if (rc < 0) {
perror("Error in ioctl");
return 1;
}
printf("Reset successful\n");
close(fd);
return 0;
}
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renege Jun 20, 2014

@x2q
Tried what was posted @ http://raspberrypi.stackexchange.com/questions/9264/how-do-i-reset-a-usb-device-using-a-script

pi@raspberrypi ~ $ sudo gcc usbreset.c -o usbreset
usbreset.c:3:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:4:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:5:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:6:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c: In function 'main':
usbreset.c:18:3: warning: incompatible implicit declaration of built-in function 'fprintf' [enabled by default]
usbreset.c:18:11: error: 'stderr' undeclared (first use in this function)
usbreset.c:18:11: note: each undeclared identifier is reported only once for each function it appears in
usbreset.c:23:22: error: 'O_WRONLY' undeclared (first use in this function)
usbreset.c:29:2: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
pi@raspberrypi ~ $ sudo cc usbreset.c -o usbreset
usbreset.c:3:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:4:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:5:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:6:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c: In function 'main':
usbreset.c:18:3: warning: incompatible implicit declaration of built-in function 'fprintf' [enabled by default]
usbreset.c:18:11: error: 'stderr' undeclared (first use in this function)
usbreset.c:18:11: note: each undeclared identifier is reported only once for each function it appears in
usbreset.c:23:22: error: 'O_WRONLY' undeclared (first use in this function)
usbreset.c:29:2: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]

renege commented Jun 20, 2014

@x2q
Tried what was posted @ http://raspberrypi.stackexchange.com/questions/9264/how-do-i-reset-a-usb-device-using-a-script

pi@raspberrypi ~ $ sudo gcc usbreset.c -o usbreset
usbreset.c:3:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:4:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:5:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:6:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c: In function 'main':
usbreset.c:18:3: warning: incompatible implicit declaration of built-in function 'fprintf' [enabled by default]
usbreset.c:18:11: error: 'stderr' undeclared (first use in this function)
usbreset.c:18:11: note: each undeclared identifier is reported only once for each function it appears in
usbreset.c:23:22: error: 'O_WRONLY' undeclared (first use in this function)
usbreset.c:29:2: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
pi@raspberrypi ~ $ sudo cc usbreset.c -o usbreset
usbreset.c:3:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:4:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:5:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c:6:10: error: #include expects "FILENAME" or <FILENAME>
usbreset.c: In function 'main':
usbreset.c:18:3: warning: incompatible implicit declaration of built-in function 'fprintf' [enabled by default]
usbreset.c:18:11: error: 'stderr' undeclared (first use in this function)
usbreset.c:18:11: note: each undeclared identifier is reported only once for each function it appears in
usbreset.c:23:22: error: 'O_WRONLY' undeclared (first use in this function)
usbreset.c:29:2: warning: incompatible implicit declaration of built-in function 'printf' [enabled by default]
@hrldcpr

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hrldcpr Nov 18, 2015

@renege the command should be:

gcc -o usbreset usbreset.c

hrldcpr commented Nov 18, 2015

@renege the command should be:

gcc -o usbreset usbreset.c
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