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Full Discussion: Save system() into char[]
Top Forums Programming Save system() into char[] Post 302625947 by migurus on Wednesday 18th of April 2012 02:29:25 PM
Old 04-18-2012
These macros are used to check process status. The pclose() call does report exit status of the process which has been run by corresponding popen().

Code:
int rc;
rc = pclose(pfp);
printf("rc=%i\n", WEXITSTATUS(rc));

Just bear in mind when examine a return code of a command, make sure IF there is a wrapper shell that executes the program which code you expect to see, then the wrapper needs to store your program's exit code and return it.
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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)
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