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Full Discussion: Function explanation
Top Forums UNIX for Beginners Questions & Answers Function explanation Post 303043526 by gowthamsoft on Thursday 30th of January 2020 11:39:46 AM
Old 01-30-2020
i am not able to understand the trim_file function.
 

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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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