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·¢ÐÅÈË: SuperSB (¹ÂÓ¥), ÐÅÇø: Linux
±ê Ìâ: [תÔØ]unix»·¾³¸ß¼¶±à³Ì-¸½B
·¢ÐÅÕ¾: BBS ˮľÇ廪վ (Wed Mar 15 14:32:22 2000)
·¢ÐÅÈË: taosm (128+64-->cool), ÐÅÇø: unix
±ê Ìâ: unix»·¾³¸ß¼¶±à³Ì--¸½Â¼B ÆäËûÔ´´úÂë
·¢ÐÅÕ¾: Î÷Ê®°ËBBS (Sat Mar 11 14:31:25 2000), תÐÅ
¸½Â¼ B
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B.1 ÎÒÃǵÄÍ·Îļþ
ÔÚÊéÕýÎÄÖеĴó¶àÊý³ÌÐò¶¼°üº¬Í·Îļþourhdr.h£¬ÕâʾÓÚ³ÌÐòB.1ÖС£ÆäÖж¨ÒåÁË
³£Êý£¨ÀýÈçMAXLINE£©ºÍÎÒÃÇ×ԱຯÊýµÄÔÐÍ¡£
ÒòΪ´ó¶àÊý³ÌÐòÐò°üº¬ÏÂÁÐÍ·Îļþ£º<stdio.h>¡¢<stdlib.h>£¨ÆäÖÐÓÐexitº¯ÊýÔ
ÐÍ£©£¬ÒÔ¼°<unistd.h>£¨ÆäÖаüº¬ËùÓбê×¼Unixº¯ÊýµÄÔÐÍ£©£¬ËùÒÔourhdr.h°üº¬
ÁËÕâЩϵͳͷÎļþ£¬Í¬Ê±»¹°üº¬ÁË<string.h>¡£ÕâÑù¾Í¼õÉÙÁ˱¾ÊéÕýÎÄÖÐËùÓгÌÐò
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/* Our own header, to be included *after* all standard system headers *
/
#ifndef __ourhdr_h
#define __ourhdr_h
#include <sys/types.h> /* required for some of our prototypes */
#include <stdio.h> /* for convenience */
#include <stdlib.h> /* for convenience */
#include <string.h> /* for convenience */
#include <unistd.h> /* for convenience */
#define MAXLINE 4096 /* max line length */
#define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
/* default file access permissions for n
w files */
#define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)
/* default permissions for new directori
s */
typedef void Sigfunc(int); /* for signal handlers */
/* 4.3BSD Reno <signal.h> doesn't define
SIG_ERR */
#if defined(SIG_IGN) && !defined(SIG_ERR)
#define SIG_ERR ((Sigfunc *)-1)
#endif
#define min(a,b) ((a) < (b) ? (a) : (b))
#define max(a,b) ((a) > (b) ? (a) : (b))
/* prototypes for our own functions */
char *path_alloc(int *); /* {Prog pathalloc} */
int open_max(void); /* {Prog openmax} */
void clr_fl(int, int); /* {Prog setfl} */
void set_fl(int, int); /* {Prog setfl} */
void pr_exit(int); /* {Prog prexit} */
void pr_mask(const char *); /* {Prog prmask} */
Sigfunc *signal_intr(int, Sigfunc *);/* {Prog signal_intr_function} */
int tty_cbreak(int); /* {Prog raw} */
int tty_raw(int); /* {Prog raw} */
int tty_reset(int); /* {Prog raw} */
void tty_atexit(void); /* {Prog raw} */
#ifdef ECHO /* only if <termios.h> has been included */
struct termios *tty_termios(void); /* {Prog raw} */
#endif
void sleep_us(unsigned int); /* {Ex sleepus} */
ssize_t readn(int, void *, size_t);/* {Prog readn} */
ssize_t writen(int, const void *, size_t);/* {Prog writen} */
int daemon_init(void); /* {Prog daemoninit} */
int s_pipe(int *); /* {Progs svr4_spipe bsd
spipe} */
int recv_fd(int, ssize_t (*func)(int, const void *, size_t));
/* {Prog
recvfd_svr4 recvfd_43bsd} */
int send_fd(int, int); /* {Progs sendfd_svr4 se
dfd_43bsd} */
int send_err(int, int, const char *);/* {Prog senderr} */
int serv_listen(const char *); /* {Progs servlisten_svr4 servli
ten_4
4bsd} */
int serv_accept(int, uid_t *); /* {Progs servaccept_svr4 servac
ept_4
4bsd} */
int cli_conn(const char *); /* {Progs cliconn_svr4 cliconn_4
bsd} */
int buf_args(char *, int (*func)(int, char **));
/* {Prog
bufargs} */
int ptym_open(char *); /* {Progs ptyopen_svr4 p
yopen_44bsd} */
int ptys_open(int, char *); /* {Progs ptyopen_svr4 ptyopen_4
bsd} */
#ifdef TIOCGWINSZ
pid_t pty_fork(int *, char *, const struct termios *,
const struct winsize *); /* {Prog ptyfork
*/
#endif
int lock_reg(int, int, int, off_t, int, off_t);
/* {Prog
lockreg} */
#define read_lock(fd, offset, whence, len) \
lock_reg(fd, F_SETLK, F_RDLCK, offset, whence, len)
#define readw_lock(fd, offset, whence, len) \
lock_reg(fd, F_SETLKW, F_RDLCK, offset, whence, len)
#define write_lock(fd, offset, whence, len) \
lock_reg(fd, F_SETLK, F_WRLCK, offset, whence, len)
#define writew_lock(fd, offset, whence, len) \
lock_reg(fd, F_SETLKW, F_WRLCK, offset, whence, len)
#define un_lock(fd, offset, whence, len) \
lock_reg(fd, F_SETLK, F_UNLCK, offset, whence, len)
pid_t lock_test(int, int, off_t, int, off_t);
/* {Prog
locktest} */
#define is_readlock(fd, offset, whence, len) \
lock_test(fd, F_RDLCK, offset, whence, len)
#define is_writelock(fd, offset, whence, len) \
lock_test(fd, F_WRLCK, offset, whence, len)
void err_dump(const char *, ...); /* {App misc_source} */
void err_msg(const char *, ...);
void err_quit(const char *, ...);
void err_ret(const char *, ...);
void err_sys(const char *, ...);
void log_msg(const char *, ...); /* {App misc_source} */
void log_open(const char *, int, int);
void log_quit(const char *, ...);
void log_ret(const char *, ...);
void log_sys(const char *, ...);
void TELL_WAIT(void); /* parent/child from {Sec race_condition
} */
void TELL_PARENT(pid_t);
void TELL_CHILD(pid_t);
void WAIT_PARENT(void);
void WAIT_CHILD(void);
#endif /* __ourhdr_h */
³ÌÐòB.1 ÎÒÃǵÄÍ·Îļþourhdr.h
ÔÚ³ÌÐòÖÐÏÈ°üÀ¨Ò»°ãϵͳͷÎļþ,È»ºóÔÙ°üÀ¨ourhdr.h£¬ÕâÑù¾ÍÄܽâ¾öijЩϵͳ
Ö®¼äµÄ²î±ð£¨ÀýÈç4.3BSDRenoÖÐûÓж¨ÒåSIG_ERR£©£¬²¢ÇÒÒ²¿É¶¨ÒåһЩÎÒÃǵĺ¯
ÊýÔÐÍ£¬¶øÕâЩ½öµ±°üÀ¨Ò»°ãϵͳͷÎļþÖ®ºó²ÅÊÇÐèÒªµÄ¡£µ±ÉÐ䶨Òåij¸ö½á¹¹¾Í
ÔÚÔÐÍÖÐÒýÓøýṹʱ£¬Ä³Ð©ANSI C±àÒë»áÈÏΪ²»Õý³£¡£
B.2 ±ê×¼³ö´í´¦ÀíÀý³Ì
ÎÒÃÇÌṩÁËÁ½Ì׳ö´í´¦ÀíÀý³Ì£¬ËüÃÇÓÃÓÚ±¾ÊéÖдó¶àÊýʵÀýÒÔ´¦Àí¸÷ÖÖ³ö´íÇé¿ö
¡£Ò»Ì×Àý³ÌÒÔerr_¿ªÍ·£¬²¢Ïò±ê×¼³ö´íÎļþÊä³öÒ»Ìõ³ö´íÏûÏ¢¡£ÁíÒ»Ì×Àý³ÌÒÔlog
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ÌṩÁËÕâЩ³ö´í´¦Àíº¯Êýºó£¬Ö»ÒªÔÚ³ÌÐòÖÐдһÐдúÂë¾Í¿ÉÒÔ½øÐгö´í´¦Àí£¬Àý
È磺
if (³ö´íÌõ¼þ)
err_dump(´øÈÎÒâ²ÎÊýµÄprintf¸ñʽ);
ÕâÑùÒ²¾Í²»ÔÙÐèҪʹÓÃÏÂÁдúÂ룺
if (³ö´íÌõ¼þ) {
char buff[200];
sprintf(buff, ´øÈÎÒâ²ÎÊýµÄprintf¸ñʽ);
perror(buff);
abort( );
}
ÎÒÃǵijö´í´¦Àíº¯ÊýʹÓÃÁËANSI CµÄ±ä³¤²ÎÊý±í¹¦ÄÜ¡£ÆäÏêϸ˵Ã÷¼ûKernighanºÍ
Ritchie[1998]µÄ7.3½Ó¡£Ó¦µ±×¢ÒâµÄÊÇÕâÒ»ANSI C¹¦ÄÜÓë½ÏÔçϵͳ£¨ÀýÈçSVR3ºÍ4
.3BSD£©ÌṩµÄvarargs¹¦Äܲ»Í¬¡£ºêµÄÃû×ÖÏàͬ£¬µ«¸ü¸ÄÁËijЩºêµÄ²ÎÊý¡£
ͼB.1ÁгöÁ˸÷¸ö³ö´í´¦Àíº¯ÊýÖ®¼äµÄÇø±ð¡£
Function strerror(errno)? Teerminate?
Err_ret yes return;
Err_sys yes exit£¨0£©;
Err_dump yes abort();
Err_msg no return;
Err_quit no exit(1);
Log_ret yes return;
Log_sys yes exit(2);
Log_msg no return;
if (³ö´íÌõ¼þ)
err_dump(´øÈÎÒâ²ÎÊýµÄprintf¸ñʽ);
ÕâÑùÒ²¾Í²»ÔÙÐèҪʹÓÃÏÂÁдúÂ룺
if (³ö´íÌõ¼þ) {
char buff[200];
sprintf(buff, ´øÈÎÒâ²ÎÊýµÄprintf¸ñʽ);
perror(buff);
abort( );
}
ÎÒÃǵijö´í´¦Àíº¯ÊýʹÓÃÁËANSI CµÄ±ä³¤²ÎÊý±í¹¦ÄÜ¡£ÆäÏêϸ˵Ã÷¼ûKernighanºÍ
Ritchie[1998]µÄ7.3½Ó¡£Ó¦µ±×¢ÒâµÄÊÇÕâÒ»ANSI C¹¦ÄÜÓë½ÏÔçϵͳ£¨ÀýÈçSVR3ºÍ4
.3BSD£©ÌṩµÄvarargs¹¦Äܲ»Í¬¡£ºêµÄÃû×ÖÏàͬ£¬µ«¸ü¸ÄÁËijЩºêµÄ²ÎÊý¡£
ͼB.1ÁгöÁ˸÷¸ö³ö´í´¦Àíº¯ÊýÖ®¼äµÄÇø±ð¡£
Function strerror(errno)? Teerminate?
Err_ret yes return;
Err_sys yes exit£¨0£©;
Err_dump yes abort();
Err_msg no return;
Err_quit no exit(1);
Log_ret yes return;
Log_sys yes exit(2);
Log_msg no return;
Log_quit no exit(2);
ͼB.1 ÎÒÃǵıê×¼³ö´í´¦Àíº¯Êý
³ÌÐòB.2°üÀ¨ÁËÊä³öÖÁ±ê×¼³ö´íÎļþµÄ¸÷¸ö³ö´í´¦Àíº¯Êý¡£
#include <errno.h> /* for definition of errno */
#include <stdarg.h> /* ANSI C header file */
#include "ourhdr.h"
static void err_doit(int, const char *, va_list);
char *pname = NULL; /* caller can set this from argv[0] */
/* Nonfatal error related to a system call.
* Print a message and return. */
void
err_ret(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
err_doit(1, fmt, ap);
va_end(ap);
return;
}
/* Fatal error related to a system call.
* Print a message and terminate. */
void
err_sys(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
err_doit(1, fmt, ap);
va_end(ap);
exit(1);
}
/* Fatal error related to a system call.
* Print a message, dump core, and terminate. */
void
err_dump(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
err_doit(1, fmt, ap);
va_end(ap);
abort(); /* dump core and terminate */
exit(1); /* shouldn't get here */
}
/* Nonfatal error unrelated to a system call.
* Caller specifies "errnoflag". */
static void
err_doit(int errnoflag, const char *fmt, va_list ap)
{
int errno_save;
char buf[MAXLINE];
errno_save = errno; /* value caller might want printed */
vsprintf(buf, fmt, ap);
if (errnoflag)
sprintf(buf+strlen(buf), ": %s", strerror(errno_save));
strcat(buf, "\n");
fflush(stdout); /* in case stdout and stderr are the same */
fputs(buf, stderr);
fflush(stderr); /* SunOS 4.1.* doesn't grok NULL argument */
return;
}
³ÌÐòB.2 Êä³öÖÁ±ê×¼³ö´íÎļþµÄ³ö´í´¦Àíº¯Êý
³ÌÐòB.3°üÀ¨Á˸÷log_xxx³ö´í´¦Àíº¯Êý¡£Èô½ø³Ì²»ÒÔ¾«Áé½ø³Ì·½Ê½½øÐУ¬ÄÇôµ÷
ÓÃÕßÓ¦µ±¶¨Òå±äÁ¿debug£¬²¢½«ÆäÉèÖÃΪ·Ç0Öµ¡£ÔÚÕâÖÖÇé¿öÏ£¬³ö´íÏûÏ¢±»ËÍÖÁ±ê
×¼³ö´íÎļþ¡£Èôdebug±ê־Ϊ0£¬ÔòʹÓÃsyslog¹¦ÄÜ£¨¼û13.4.2½Ú£©¡£
/* Error routines for programs that can run as a daemon. */
#include <errno.h> /* for definition of errno */
#include <stdarg.h> /* ANSI C header file */
#include <syslog.h>
#include "ourhdr.h"
static void log_doit(int, int, const char *, va_list ap);
extern int debug; /* caller must define and set this:
nonzero if interactive, zero if daemon */
/* Initialize syslog(), if running as daemon. */
void
log_open(const char *ident, int option, int facility)
{
if (debug == 0)
openlog(ident, option, facility);
}
/* Nonfatal error related to a system call.
* Print a message with the system's errno value and return. */
void
log_ret(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
log_doit(1, LOG_ERR, fmt, ap);
va_end(ap);
return;
}
/* Fatal error related to a system call.
* Print a message and terminate. */
void
log_sys(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
log_doit(1, LOG_ERR, fmt, ap);
va_end(ap);
exit(2);
}
/* Nonfatal error unrelated to a system call.
* Print a message and return. */
void
log_msg(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
log_doit(0, LOG_ERR, fmt, ap);
va_end(ap);
return;
}
/* Fatal error unrelated to a system call.
* Print a message and terminate. */
void
log_quit(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
log_doit(0, LOG_ERR, fmt, ap);
va_end(ap);
exit(2);
}
/* Print a message and return to caller.
* Caller specifies "errnoflag" and "priority". */
static void
log_doit(int errnoflag, int priority, const char *fmt, va_list ap)
{
int errno_save;
char buf[MAXLINE];
errno_save = errno; /* value caller might want printed */
vsprintf(buf, fmt, ap);
if (errnoflag)
sprintf(buf+strlen(buf), ": %s", strerror(errno_save));
strcat(buf, "\n");
if (debug) {
fflush(stdout);
fputs(buf, stderr);
fflush(stderr);
} else
syslog(priority, buf);
return;
}
³ÌÐòB.3 ÓÃÓÚ¾«Áé½ø³ÌµÄ´¦Àíº¯Êý
ý
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