/*?$begin?csapp.c?*/
#include?“csapp.h“

/**************************?
?*?Error-handling?functions
?**************************/
/*?$begin?errorfuns?*/
/*?$begin?unixerror?*/
void?unix_error（char?*msg）?/*?unix-style?error?*/
{
????fprintf（stderr?“%s:?%s\n“?msg?strerror（errno））;
????exit（0）;
}
/*?$end?unixerror?*/

void?posix_error（int?code?char?*msg）?/*?posix-style?error?*/
{
????fprintf（stderr?“%s:?%s\n“?msg?strerror（code））;
????exit（0）;
}

void?dns_error（char?*msg）?/*?dns-style?error?*/
{
????fprintf（stderr?“%s:?DNS?error?%d\n“?msg?h_errno）;
????exit（0）;
}

void?app_error（char?*msg）?/*?application?error?*/
{
????fprintf（stderr?“%s\n“?msg）;
????exit（0）;
}
/*?$end?errorfuns?*/

/*********************************************
?*?Wrappers?for?Unix?process?control?functions
?********************************************/

/*?$begin?forkwrapper?*/
pid_t?Fork（void）?
{
????pid_t?pid;

????if?（（pid?=?fork（））?	unix_error（“Fork?error“）;
????return?pid;
}
/*?$end?forkwrapper?*/

void?Execve（const?char?*filename?char?*const?argv[]?char?*const?envp[]）?
{
????if?（execve（filename?argv?envp）?	unix_error（“Execve?error“）;
}

/*?$begin?wait?*/
pid_t?Wait（int?*status）?
{
????pid_t?pid;

????if?（（pid??=?wait（status））?	unix_error（“Wait?error“）;
????return?pid;
}
/*?$end?wait?*/

pid_t?Waitpid（pid_t?pid?int?*iptr?int?options）?
{
????pid_t?retpid;

????if?（（retpid??=?waitpid（pid?iptr?options））?	unix_error（“Waitpid?error“）;
????return（retpid）;
}

/*?$begin?kill?*/
void?Kill（pid_t?pid?int?signum）?
{
????int?rc;

????if?（（rc?=?kill（pid?signum））?	unix_error（“Kill?error“）;
}
/*?$end?kill?*/

void?Pause（）?
{
????（void）pause（）;
????return;
}

unsigned?int?Sleep（unsigned?int?secs）?
{
????unsigned?int?rc;

????if?（（rc?=?sleep（secs））?	unix_error（“Sleep?error“）;
????return?rc;
}

unsigned?int?Alarm（unsigned?int?seconds）?{
????return?alarm（seconds）;
}
?
void?Setpgid（pid_t?pid?pid_t?pgid）?{
????int?rc;

????if?（（rc?=?setpgid（pid?pgid））?	unix_error（“Setpgid?error“）;
????return;
}

pid_t?Getpgrp（void）?{
????return?getpgrp（）;
}

/************************************
?*?Wrappers?for?Unix?signal?functions?
?***********************************/

/*?$begin?sigaction?*/
handler_t?*Signal（int?signum?handler_t?*handler）?
{
????struct?sigaction?action?old_action;

????action.sa_handler?=?handler;??
????sigemptyset（&action.sa_mask）;?/*?block?sigs?of?type?being?handled?*/
????action.sa_flags?=?SA_RESTART;?/*?restart?syscalls?if?possible?*/

????if?（sigaction（signum?&action?&old_action）?	unix_error（“Signal?error“）;
????return?（old_action.sa_handler）;
}
/*?$end?sigaction?*/

void?Sigprocmask（int?how?const?sigset_t?*set?sigset_t?*oldset）
{
????if?（sigprocmask（how?set?oldset）?	unix_error（“Sigprocmask?error“）;
????return;
}

void?Sigemptyset（sigset_t?*set）
{
????if?（sigemptyset（set）?	unix_error（“Sigemptyset?error“）;
????return;
}

void?Sigfillset（sigset_t?*set）
{?
????if?（sigfillset（set）?	unix_error（“Sigfillset?error

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????17746??2011-04-02?16:02??csapp.c

?????文件???????5581??2011-04-02?14:16??csapp.h

-----------?---------??----------?-----??----

????????????????23327????????????????????2