fsetxattr() fails on a writable descriptor? (original) (raw)

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From: Pádraig Brady
Subject: fsetxattr() fails on a writable descriptor?
Date: Tue, 8 Sep 2009 12:29:49 +0100
User-agent: Thunderbird 2.0.0.6 (X11/20071008)

fsetxattr() is failing for me when the permissions are readonly but the descriptor is writable as demonstrated by the program below. I've tried this on ext3 and ext4 with libattr-2.4.43-3.fc11.i586 and linux-2.6.30.5-43.fc11.i586

Is this expected?

cheers, Pádraig.

#include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <attr/libattr.h> #include <stdio.h> #include <unistd.h>

int main(void) { int wfd; if ((wfd=open("writable", O_CREAT|O_WRONLY|O_EXCL, S_IRUSR)) == -1) fprintf(stderr, "open('writable') error [%m]\n"); if (write(wfd, "data", 1) == -1) fprintf(stderr, "write() error [%m]\n"); if (fsetxattr(wfd, "user.test", "test", 4, 0) == -1) fprintf(stderr, "fsetxattr() error [%m]\n"); }