readlink segmentation fault

Schwarzhelm · 05-21-2003, 07:44 AM

Code:

 if( S_ISLNK(mode) )
			{ 
				type = 'l'; /*symlink*/
				readlink(fileName, buf, sizeof(buf));
				printf("\n %s \n",buf);

				
			}

I have this and I keep getting segmentation faults. All I am trying to do is print out the location of a symbolic link. Any suggestions?

DavT · 05-21-2003, 07:54 AM

Very difficult to say for certain without knowing exactly what readlink() does, but segmentation faults usually arise when you write over the end of allocated memory. My suspicion would be on buf. How is it declared? Is it big enough to hold the string? Is sizeof(buf) giving you the answer you expect?

Schwarzhelm · 05-21-2003, 08:02 AM

I have buf declared as a char *buf. I tried the code that was suggested and it is still getting a segmentation fault. filename is dirp->d_name after a lstat.

Thank you.

05-21-2003, 07:44 AM	#1
Schwarzhelm Registered User Join Date: Apr 2003 Posts: 23	readlink segmentation fault Code: if( S_ISLNK(mode) ) { type = 'l'; /symlink/ readlink(fileName, buf, sizeof(buf)); printf("\n %s \n",buf); } I have this and I keep getting segmentation faults. All I am trying to do is print out the location of a symbolic link. Any suggestions?
Schwarzhelm is offline

05-21-2003, 07:54 AM	#2
DavT Registered User Join Date: Mar 2003 Posts: 143	Very difficult to say for certain without knowing exactly what readlink() does, but segmentation faults usually arise when you write over the end of allocated memory. My suspicion would be on buf. How is it declared? Is it big enough to hold the string? Is sizeof(buf) giving you the answer you expect?
DavT is offline

05-21-2003, 08:02 AM	#3
Schwarzhelm Registered User Join Date: Apr 2003 Posts: 23	I have buf declared as a char *buf. I tried the code that was suggested and it is still getting a segmentation fault. filename is dirp->d_name after a lstat. Thank you.
Schwarzhelm is offline

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