Another project, another bump in the road and another chance to learn. I've been trying to open gzipped files and parse data from them and hit a snag. I have data in gzips with a place followed by an ip or ip range sort of like this:
I was able to modify some code I found that works fine for parsing the data to only show the ips:
Result:
However, when I add it to the code I have for opening the gzips and reading them I get a segmentation fault. Here is the code I am trying to work from now:
I tried to look at this with strace and it seems to die directly after reading the first line. Any thoughts appreciated.
I have data that looks like this
aaa!bbb!ccc/ddd/eee
It is not fixed format. I need to parse ddd into a var in order to decide if I want to process that row. If I do I need to put ccc and bbb into vars to process it. I need to do this during a while loop one record at a time. Any... (11 Replies)
i am trying to use the history functions in a c++ program along with a custom signal handler for SIGINT.
the prog works fine catching signals without the line:
add_history(*args);
but as soon as this line is added, the prog segfaults on SIGINT.
does anyone have experience using gnu... (2 Replies)
Hello, sorry if this has been posted before but i was wondering if there is a way to run a program until a segmentation fault is found.
Currently i'm using a simple shell script which runs my program 100 times, sleeps 1 second because srand(time(0)) is dependent on seconds. Is there a possible... (1 Reply)
We have a Solaris 8 server which users login to via VNC to get a desktop. On that desktop these users use Netscape Communicator 4.9 to access a very important mail account. Unfortunately Netscape has started segfaulting regularly.
Does anyone have any ideas how I can try to find out what point... (1 Reply)
1. Even if i have the handles for ctrl+c it gives off a segfault
2. syslog doesn't log LOG_ERR event with log masked specified or non specified, it logs LOG_WARNING however...
#include <sys/types.h> /* include this before any other sys headers */
#include <sys/stat.h>
#include <fcntl.h>... (2 Replies)
Hello everyone,
I'm writing a program using the id3lib unfortunately I've encountered with memory issue that cause segmentation fault. I tried to rerun and analyze the program with valgrind but it doesn't point me anywhere. I really stuck on this one.
Valgrind output:
==14716== Invalid read of... (2 Replies)
I have a program that allows users to specify the debug log file location and name.
I have tried using the access() and stat() but they both segfault if the drive say (d:\) is invalid. Both seem to be fine if the drive exists.
Could someone please point me in the direction to a function that... (1 Reply)
hello all,
my question is not about How code can be rewritten, i just wanna know even though i am not using read only memory of C (i have declared str) why this function gives me segfault :wall:and the other code executes comfortably though both code uses same pointer arithmetic.
... (4 Replies)
I am populating an array of string and print it.
But it going in infinite loop and causing segfault.
char Name = {
"yahoo",
"rediff",
"facebook",
NULL
};
main(int argc, char* argv)
{
int j = 0;
... (7 Replies)
Hello:
I have some text output, on SunOS 5.11 platform using KSH:
I am trying to parse out each string within the () for each line.
I tried, as example:
perl -lanF"" -e 'print "$F $F $F $F $F $F"'
But for some reason, the output gets all garbled after the the first fields.... (8 Replies)
Discussion started by: gilgamesh
8 Replies
LEARN ABOUT SUNOS
p2close
p2open(3GEN) String Pattern-Matching Library Functions p2open(3GEN)NAME
p2open, p2close - open, close pipes to and from a command
SYNOPSIS
cc [ flag ... ] file ... -lgen [ library ... ]
#include <libgen.h>
int p2open(const char *cmd, FILE *fp[2]);
int p2close(FILE *fp[2]);
DESCRIPTION
p2open() forks and execs a shell running the command line pointed to by cmd. On return, fp[0] points to a FILE pointer to write the com-
mand's standard input and fp[1] points to a FILE pointer to read from the command's standard output.
In this way the program has control over the input and output of the command.
The function returns 0 if successful; otherwise, it returns -1.
p2close() is used to close the file pointers that p2open() opened. It waits for the process to terminate and returns the process status.
It returns 0 if successful; otherwise, it returns -1.
RETURN VALUES
A common problem is having too few file descriptors. p2close() returns -1 if the two file pointers are not from the same p2open().
EXAMPLES
Example 1: Example of file descriptors.
#include <stdio.h>
#include <libgen.h>
main(argc,argv)
int argc;
char **argv;
{
FILE *fp[2];
pid_t pid;
char buf[16];
pid=p2open("/usr/bin/cat", fp);
if ( pid == -1 ) {
fprintf(stderr, "p2open failed
");
exit(1);
}
write(fileno(fp[0]),"This is a test
", 16);
if(read(fileno(fp[1]), buf, 16) <=0)
fprintf(stderr, "p2open failed
");
else
write(1, buf, 16);
(void)p2close(fp);
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|MT-Level |Unsafe |
+-----------------------------+-----------------------------+
SEE ALSO fclose(3C), popen(3C), setbuf(3C), attributes(5)NOTES
Buffered writes on fp[0] can make it appear that the command is not listening. Judiciously placed fflush() calls or unbuffering fp[0] can
be a big help; see fclose(3C).
Many commands use buffered output when connected to a pipe. That, too, can make it appear as if things are not working.
Usage is not the same as for popen(), although it is closely related.
SunOS 5.10 29 Dec 1996 p2open(3GEN)