p2close(3gen) [opensolaris man page]

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

       The  p2open()gfunction  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 command'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.

       The  p2close()  function  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. The p2close() function 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 5.11							    29 Dec 1996 						      p2open(3GEN)

Check Out this Related Man Page

copylist(3GEN)					     String Pattern-Matching Library Functions					    copylist(3GEN)

NAME

       copylist - copy a file into memory

SYNOPSIS

       cc [ flag ... ] file ... -lgen [ library ... ]
       #include <libgen.h>

       char *copylist(const char *filenm, off_t *szptr);

DESCRIPTION

       The  copylist()	function  copies a list of items from a file into freshly allocated memory,  replacing new-lines with null characters.	It
       expects two arguments: a pointer filenm to the name of the file to be copied, and a pointer szptr to a variable where the size of the  file
       will be stored.

       Upon  success, copylist() returns a pointer to the memory allocated.  Otherwise it returns NULL if it has trouble finding the file, calling
       malloc(), or reading the file.

USAGE

       The copylist() function has a transitional interface for 64-bit file offsets. See lf64(5).

EXAMPLES

       Example 1 Example of copylist() function.

	 /* read "file" into buf */
	 off_t size;
	 char *buf;
	 buf = copylist("file", &size);
	 if (buf) {
	      for (i=0; i<size; i++)
		   if (buf[i])
			putchar(buf[i]);
		   else
			putchar('
');
	      }
	 } else {
	      fprintf(stderr, "%s: Copy failed for "file".
", argv[0]);
	      exit(1);
	 }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       malloc(3C), attributes(5), lf64(5)

NOTES

       When compiling multithreaded applications, the _REENTRANT flag must be defined on the compile line.  This flag should only be used in  mul-
       tithreaded applications.

SunOS 5.11							    29 Dec 1996 						    copylist(3GEN)

Linux and UNIX Man Pages

p2close(3gen) [opensolaris man page]

Check Out this Related Man Page