To ensure the file is readable

Question

In pset6, server.c,

what should I do to make sure the file is readable?

the problem set guide says it's possible to use "stat" or "access"?

since both return 0 on success and -1 if not, how do I know if the file is readable?

or can I use the return value 0 or -1 to determine if the file is readable?

Thanks!

Yes, I did. But I'm a little bit confusing about what to do to determine if readable. If I use stat, it seems that "mode_t st_mode;" in struct stat might be what I have to deal with. And if I use access, "mode" also seems to be what I have to deal with as well. But what should I do to deal with those mode things? — Y_C, Feb 20, 2015 at 13:56
I'm now understanding a bit. And, is it okay to use "access(path, R_OK) == 0" to determine if the file is readable? — Y_C, Feb 20, 2015 at 14:20

Y_C · Accepted Answer · 2015-02-27 12:54:32Z

2

This can be done by using "access", as suggested in the pset sheet.

e.g.

use

access(path, R_OK)

to check if the file is readable, and it'll return 0 if readable and return -1 if not.

consult manpage for more information.

answered Feb 27, 2015 at 12:54

Y_C

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