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popen(3)							      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 cre‐
       ated, 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)
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