Re: Unable to use/compile libarchive 2.4.12-1

"Kees Zeelenberg" <[email protected]> schrieb am Freitag, 29. August 2008 um 15:19 +0200:
>
>
>> I downloaded libarchive 2.4.12-1 and tried the simple test program from 
>> the archive_write.3 documentation.
>> The program failed with a segment fault in function write_archive_header() 
>> in archive_write.c:319.
>> As libarchive-2.5.5 does not contain the call to function strcmp() at that 
>> line, I tried to build 2.5.5 directly, but was unable to
>> do so.

>Could you post a small program, preferably the smallest one possible, that 
>fails in this way? And also give the exact compilation and linking commands 
>that you used.

I'm afraid i can't get it any smaller. The file test.c compiled and linked with: 

	gcc -I/c/Programme/GnuWin32/include -o test1.exe test.c -L/c/Programme/GnuWin32/lib -larchive

I use MSYS instead of cygwin for compiling, hence /c instead of /cygdrive/c for the -I and -L flags.
It compiles fine, but fails on runtime with a segment fault at the line denoted with ->. A stacktrace generated
by GDB leads to the source described above:

#include <sys/stat.h>
#include <archive.h>
#include <archive_entry.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>

struct mydata
{
	const char *name;
	int fd;
};

int myopen(struct archive *a, void *client_data) 
{
	struct mydata *mydata = client_data;

	mydata->fd = open(mydata->name, O_WRONLY | O_CREAT, 0644); 
	if (mydata->fd >= 0)
		return (ARCHIVE_OK);
	else
		return (ARCHIVE_FATAL);
}

ssize_t mywrite(struct archive *a, void *client_data, const void *buff, size_t n) 
{
	struct mydata *mydata = client_data;

	return (write(mydata->fd, buff, n));
}

int myclose(struct archive *a, void *client_data)
{
	struct mydata *mydata = client_data;

	if (mydata->fd > 0)
		close(mydata->fd);

	return (0);
}

void write_archive(const char *outname, const char **filename) 
{
	struct mydata *mydata = malloc(sizeof(struct mydata)); 
	struct archive *a;
	struct archive_entry *entry;
	struct stat st;
	char buff[8192];
	int len;
	int fd;

	a = archive_write_new();
	mydata->name = outname;
	archive_write_set_compression_gzip(a); archive_write_set_format_ustar(a);
	archive_write_open(a, mydata, myopen, mywrite, myclose); 
	while (*filename)
	{
		stat(*filename, &st);
		entry = archive_entry_new();
		archive_entry_copy_stat(entry, &st); 
		archive_entry_set_pathname(entry, *filename); 
/*->*/		archive_write_header(a, entry);
		fd = open(*filename, O_RDONLY);
		len = read(fd, buff, sizeof(buff)); while ( len > 0 ) {
		archive_write_data(a, buff, len); len = read(fd, buff, sizeof(buff)); }
		archive_entry_free(entry);
		filename++;
	}
	archive_write_finish(a);
}

int main(int argc, const char **argv)
{
	const char *outname;
	argv++;
	outname = *(argv++);
	write_archive(outname, argv);
	return 0;
} 

>Libarchive-2.4.12-1 should compile as it is, i.e. unpack 
>libarchive-2.4.12-1-src.zip, and at a Cygwin bash prompt in the directory 
>libarchive-2.4.12, type: "./config.status" (in order to recreate the .deps 
>subdirectories) and then: "make"; see also 
>http://gnuwin32.sourceforge.net/compile.html

Looks like i got some MSYS issues here. I will install cygwin and try again.

Regards,
Oliver Fladda
>
>

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