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Top Forums Programming how exactly does pclose work in C? Post 302504951 by Corona688 on Tuesday 15th of March 2011 08:07:36 PM
Old 03-15-2011
Quote:
Originally Posted by omega666
here its supposed to return the exit code of the command, in this case is the exit code equal to pstat?
Sorry, could you rephrase that?
Quote:
and why didnt it use WEXITSTATUS?
Because the code is very, very old.
Quote:
still i dont understand how something can be removed from the chain..
All you do is alter the pointers so nothing's pointing to the node you want to remove any more. Then you're free to delete it or free() it or whatever.
Quote:
can u make an example where there is like 5 structs in the chain, then u remove the 1st or 3rd or last so i can see the easy way to remove structs from the chain
Can you use the word "you"? Can you tell me you've actually compiled any of the code I've written for you?
 

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explain_pclose_or_die(3)				     Library Functions Manual					  explain_pclose_or_die(3)

NAME
explain_pclose_or_die - process I/O and report errors SYNOPSIS
#include <libexplain/pclose.h> int explain_pclose_or_die(FILE *fp); int explain_pclose_success(FILE *fp); void explain_pclose_success_or_die(FILE *fp); DESCRIPTION
These functions may be used to wait for program termination, and then reprt errors returned by the pclose(3) system call. explain_pclose_or_die int explain_pclose_or_die(FILE *fp); The explain_pclose_or_die function is used to call the pclose(3) system call. On failure an explanation will be printed to stderr, obtained from explain_pclose(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: int status = explain_pclose_or_die(fp); fp The fp, exactly as to be passed to the pclose(3) system call. Returns: This function only returns on success, see pclose(3) for more information. On failure, prints an explanation and exits. explain_pclose_success_or_die void explain_pclose_success_or_die(FILE *); The explain_pclose_success_or_die function is used to call the pclose(3) system call. On failure, including any exit status other than EXIT_SUCCESS, an explanation will be printed to stderr, obtained from explain_pclose(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: explain_pclose_success_or_die(fp); fp The fp, exactly as to be passed to the pclose(3) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. explain_pclose_success int explain_pclose_success(FILE *fp); The explain_pclose_success function is used to call the pclose(3) system call. On failure, including any exit status other than EXIT_SUC- CESS, an explanation will be printed to stderr, obtained from explain_pclose(3). However, the priniting of an error message does not also cause exit(2) to be called. This function is intended to be used in a fashion similar to the following example: int status = explain_pclose_success(command); fp The fp, exactly as to be passed to the pclose(3) system call. Returns: the value returned by the pclose(3) system call. In all cases other than EXIT_SUCCESS, an error message will also have been printed to stderr. SEE ALSO
pclose(3) process I/O explain_pclose(3) explain pclose(3) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2009 Peter Miller explain_pclose_or_die(3)
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