How to get current working directory from Android Linux to help debug a file not found issue?

[Dave McLaughlin]

I am trying to track down a file not found error in a Realtek WiFi driver and I am trying to get the current working directory and print this to the debug output.

I can't find which header file getcwd() is located in. Most website searches indicate to use <linux/unistd.g> but this doesn't work and I get a compiler error when I try to use getcwd()

A search of the Linux source finds many references to this function.

[Glenn Kasten]

Did you try <unistd.h>  ?  Note the "h" not "g" at end, and no leading "linux/"

[Dave McLaughlin]

Yes, tried that and I get a file not found for that header file.

With the leading linux/ it finds the file but the header file does not contain a reference to that function.

There are over 50 files called unistd.h in the source.

I am trying to compile drivers/base/firmware_class.c to add some diagnostics to see why the wifi driver gives file not found.

[Martin Brabham]

Do you have your includes setup to target bionic/libc/include?

bionic/libc/include/unistd.h

Line 229: char* getcwd(char* __buf, size_t __size);

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•  Martin Brabham   •  Software Engineer   •  Android Bluetooth   •  352.327.8280

[Dave McLaughlin]

Those files are in the Android source but not in the Linux kernel. 

The driver is at the kernel level and I need some way to display the current working directory that the driver is attempting to load the BIN file from. 

There is a load of unistd.h files in the kernel source tree but none of them contain the getcwd() function.

On Monday, 6 April 2020 23:05:34 UTC+7, Martin Brabham wrote:

Do you have your includes setup to target bionic/libc/include?

bionic/libc/include/unistd.h

Line 229: char* getcwd(char* __buf, size_t __size);

On Thu, Apr 2, 2020 at 8:27 AM Dave McLaughlin <davemcla...@gmail.com> wrote:

Yes, tried that and I get a file not found for that header file.

With the leading linux/ it finds the file but the header file does not contain a reference to that function.

There are over 50 files called unistd.h in the source.

I am trying to compile drivers/base/firmware_class.c to add some diagnostics to see why the wifi driver gives file not found.

On Thursday, 2 April 2020 00:00:48 UTC+7, Glenn Kasten wrote:

Did you try <unistd.h>  ?  Note the "h" not "g" at end, and no leading "linux/"

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