08-21-2006
Quote:
Originally Posted by jim mcnamara
I'm confused. Are you trying to call popen() against an already existing process?
Or is the process being created becoming a background process with no controlling terminal?
In either case popen will not work. As you know. You can test to see if popen is still working with a valid stream. popen returns a FILE *ptr, so you can call (on Linux) isastream(fileno(ptr)) or more generally ioctl(fileno(ptr), I_CANPUT,0). These will return errors approiately. Assuming I understand what you're asking...
You may also want to check out the isatty() function.
this is the situation...
dedicated server program which is a background process without any controlling terminal which forks another server instance to handle client requests...
in that the program handling a client request - it checks whether a particular process is running or not..
the command string is framed it and it is passed to the popen function call and it fails there...
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popen(3) Library Functions Manual popen(3)
Name
popen, pclose - initiate I/O to/from a process
Syntax
#include <stdio.h>
FILE *popen(command, type)
char *command, *type;
pclose(stream)
FILE *stream;
Description
The arguments to are pointers to null-terminated strings containing respectively a shell command line and an I/O mode, either "r" for read-
ing or "w" for writing. It creates a pipe between the calling process and the command to be executed. The value returned is a stream
pointer that can be used (as appropriate) to write to the standard input of the command or read from its standard output.
A stream opened by should be closed by which waits for the associated process to terminate and returns the exit status of the command.
Because open files are shared, a type "r" command may be used as an input filter, and a type "w" as an output filter.
Diagnostics
The routine returns a null pointer if files or processes cannot be created, or the shell cannot be accessed.
The routine returns -1 if stream is not associated with a `popened' command.
Restrictions
Buffered reading before opening an input filter may leave the standard input of that filter mispositioned. Similar problems with an output
filter may be forestalled by careful buffer flushing, for instance, with For further information, see
The routine always calls and never calls
See Also
sh(1), pipe(2), wait(2), system(3), fclose(3s), fopen(3s)
popen(3)