i2c_open("/dev/i2c-0") returns false

[tasoftch]

i2c_open("/dev/i2c-0") returns false

[tasoftch]

What version of php are you using?
I've tested with version 7.2 and 7.3, so probably the line 68 might to be updated.
You can test the devPath's content by adding the following code temporary:
printf("%s", devPath);

[chun-3]

The version is as follows.
os: Ubuntu 18.04.5 LTS (Bionic Beaver) / arm64
apache: 2.4.29
php: PHP 7.2.24-0ubuntu0.18.04.6

I inserted printf and checked it, but I could not check it with the following error.
[Sun Sep 27 08: 41: 39.954638 2020] [core: notice] [pid 2493] AH00052: child pid 2494 exit signal Segmentation fault (11)

So, I changed it as follows, but it was the same.

for (int i = 0; i <16; i ++) printf ("% 02X", devPath [i]);
printf ("\ n");

Next, I tried to write the contents to the file, but no error occurred, but the file could not be created (it could not be opened normally).

FILE * fp = fopen ("/tmp/debug.log", "w");
if (fp! = NULL) {
for (int i = 0; i <16; i ++) fprintf (fp, "% 02X", devPath [i]);
fprintf (fp, "\ n");
fclose (fp);
}

[chun-3]

I additionally confirmed the following.

PHP:
ini_set('display_errors', "On");
$fd = i2c_open("/dev/i2c-0");

i2c.c:
if (fd < 0) {
zend_error(E_WARNING, "open error[%p %p %p %d]", &devPath, devPath, &length, length);
RETURN_BOOL(0);
}
result:
Warning: open error[0x7fddfa7970 0x7f00000000 0x7fddfa796c 10] in /var/www/html/i2ctest.php on line 3

Next, I made the following changes.
i2c.c:
if (fd < 0) {
zend_error(E_WARNING, "open error[%p %p %02X %p %d]", &devPath, devPath, devPath[0], &length, length);
RETURN_BOOL(0);
}
result:
child pid 7628 exit signal Segmentation fault (11)

[chun-3]

The problem has been resolved. I think it's okay, but please check.

I was worried that the lower 32 bits of devPath was '0' and checked the size of length

sizeof(int)=4 sizeof(size_t)=8

It seems that the lower 32 bits of devPath were overwritten when length was written. I changed i2c.c as follows.

char *devPath;

// int length;
size_t length;

Also, I was worried about the warning at compile time and added the following.

#include <sys/ioctl.h>

[tasoftch]

I've fixed, changing length to size_t and I also initialized it with 0.