Check the exit status in a pipe call

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pclose

pclose(3)						     Library Functions Manual							 pclose(3)

NAME

       pclose -  Closes a pipe to a process

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <stdio.h>

       int pclose (
	       FILE *stream );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       pclose():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Points to a FILE structure for an open pipe returned by a previous call to the popen() function.

DESCRIPTION

       The  pclose() function closes a pipe between the calling program and a shell command to be executed. Use the pclose() function to close any
       stream you have opened with the popen() function. The pclose() function waits for the associated process to end, and then returns the  exit
       status  of  the	command.   If the original processes and the process started with the popen() function concurrently read or write a common
       file, neither should use buffered I/O. If they do, the results are unpredictable.

RETURN VALUES

       Upon successful completion, the pclose() function returns the exit status of the command.

       If an error is detected, pclose() sets errno to an appropriate value and returns a value of -1.

ERRORS

       If the pclose() function fails, errno may be set to the following value: The status of the child process could not be obtained.

RELATED INFORMATION

       Functions: fclose(3), popen(3), wait(2)

       Standards: standards(5) delim off

																	 pclose(3)

Shell Programming and Scripting