unix编程书中的 ourhdr.h代码
真心不知到里面写的具体什么意思，先记下吧。
1 /*Our own header, to be included after all standard system headers*/ 2 #ifndef __ourhdr_h 3 #define __ourhdr_h 4 5 #include <errno.h> /*for definition of errno */ 6 #include <stdarg.h> /*ANSI C header file */ 7 #include <sys/types.h> /* required for some of our prototypes */ 8 #include <stdio.h> /* for convenience */ 9 #include <stdlib.h> /* for convenience */ 10 #include <string.h> /* for convenience */ 11 #include <unistd.h> /* for convenience */ 12 13 #define MAXLINE 4096 /* max line length */ 14 #define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) 15 /* default file access permissions for new files */ 16 #define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH) 17 /* default permissions for new directoris */ 18 typedef void Sigfunc(int); /* for signal handlers */ 19 /* 4.3BSD Reno <signal.h> doesn't define 20 SIG_ERR */ 21 #if defined(SIG_IGN) && !defined(SIG_ERR) 22 #define SIG_ERR ((Sigfunc *)-1) 23 #endif 24 #define min(a,b) ((a) < (b) ? (a) : (b)) 25 #define max(a,b) ((a) > (b) ? (a) : (b)) 26 /* prototypes for our own functions */ 27 char *path_alloc(int *); /* {Prog pathalloc} */ 28 int open_max(void); /* {Prog openmax} */ 29 void clr_fl(int, int); /* {Prog setfl} */ 30 void set_fl(int, int); /* {Prog setfl} */ 31 void pr_exit(int); /* {Prog prexit} */ 32 void pr_mask(const char *); /* {Prog prmask} */ 33 Sigfunc *signal_intr(int, Sigfunc *); /* {Prog signal_intr_function} */ 34 int tty_cbreak(int); /* {Prog raw} */ 35 int tty_raw(int); /* {Prog raw} */ 36 int tty_reset(int); /* {Prog raw} */ 37 void tty_atexit(void); /* {Prog raw} */ 38 39 #ifdef ECHO /* only if <termios.h> has been included */ 40 struct termios *tty_termios(void); /* {Prog raw} */ 41 #endif 42 void sleep_us(unsigned int); /* {Ex sleepus} */ 43 ssize_t readn(int, void *, size_t); /* {Prog readn} */ 44 ssize_t writen(int, const void *, size_t); /* {Prog writen} */ 45 int daemon_init(void); /* {Prog daemoninit} */ 46 int s_pipe(int *); /* {Progs svr4_spipe bsd spipe} */ 47 int recv_fd(int, ssize_t (*func)(int, const void *, size_t)); 48 /* {Prog recvfd_svr4 recvfd_43bsd} */ 49 50 int send_fd(int, int); /* {Progs sendfd_svr4 se 51 dfd_43bsd} */ 52 int send_err(int, int, const char *);/* {Prog senderr} */ 53 int serv_listen(const char *); /* {Progs servlisten_svr4 servli 54 ten_4 55 4bsd} */ 56 int serv_accept(int, uid_t *); /* {Progs servaccept_svr4 servac 57 ept_4 58 4bsd} */ 59 int cli_conn(const char *); /* {Progs cliconn_svr4 cliconn_4 60 bsd} */ 61 int buf_args(char *, int (*func)(int, char **)); 62 /* {Prog bufargs} */ 63 int ptym_open(char *); /* {Progs ptyopen_svr4 p yopen_44bsd} */ 64 int ptys_open(int, char *); /* {Progs ptyopen_svr4 ptyopen_4 bsd} */ 65 66 #ifdef TIOCGWINSZ 67 pid_t pty_fork(int *, char *, const struct termios *, 68 const struct winsize *); /* {Prog ptyfork */ 69 #endif 70 int lock_reg(int, int, int, off_t, int, off_t); /* {Prog lockreg} */ 71 72 #define read_lock(fd, offset, whence, len) lock_reg(fd, F_SETLK, F_RDLCK, offset, whence, len) 73 #define readw_lock(fd, offset, whence, len) lock_reg(fd, F_SETLKW, F_RDLCK, offset, whence, len) 74 #define write_lock(fd, offset, whence, len) lock_reg(fd, F_SETLK, F_WRLCK, offset, whence, len) 75 #define writew_lock(fd, offset, whence, len) lock_reg(fd, F_SETLKW, F_WRLCK, offset, whence, len) 76 #define un_lock(fd, offset, whence, len) lock_reg(fd, F_SETLK, F_UNLCK, offset, whence, len) 77 pid_t lock_test(int, int, off_t, int, off_t); /* {Prog locktest} */ 78 #define is_readlock(fd, offset, whence, len) lock_test(fd, F_RDLCK, offset, whence, len) 79 #define is_writelock(fd, offset, whence, len) lock_test(fd, F_WRLCK, offset, whence, len) 80 void err_dump(const char *, ...); /* {App misc_source} */ 81 void err_msg(const char *, ...); 82 void err_quit(const char *, ...); 83 void err_ret(const char *, ...); 84 void err_sys(const char *, ...); 85 void log_msg(const char *, ...); /* {App misc_source} */ 86 void log_open(const char *, int, int); 87 void log_quit(const char *, ...); 88 void log_ret(const char *, ...); 89 void log_sys(const char *, ...); 90 void TELL_WAIT(void); /* parent/child from {Sec race_condition } */ 91 void TELL_PARENT(pid_t); 92 void TELL_CHILD(pid_t); 93 void WAIT_PARENT(void); 94 void WAIT_CHILD(void); 95 #endif /* __ourhdr_h */ 96 97 static void err_doit(int, const char*, va_list); 98 char *pname = NULL; /* caller can set this from argv[0]*/ 99 /* Nonfatal error realated to a system call . print a message and return . */ 100 void err_ret(const char *fmt,...) 101 { 102 va_list ap; 103 va_start(ap, fmt); 104 err_doit(1, fmt, ap); 105 va_end(ap); 106 107 return; 108 } 109 110 /* Fatal error related to a system call . print a message and terminate. */ 111 void err_sys(const char *fmt,...) 112 { 113 va_list ap; 114 va_start(ap, fmt); 115 err_doit(1, fmt, ap); 116 va_end(ap); 117 exit(1); 118 } 119 /* Fatal error related to a system call . print a message ,dump core ,and terminate. */ 120 void err_dump(const char *fmt,...) 121 { 122 va_list ap; 123 124 va_start(ap, fmt); 125 err_doit(1, fmt, ap); 126 va_end(ap); 127 abort(); /* dump core and terminate */ 128 exit(1); /* shouldn't get here */ 129 } 130 131 /* Nofatal error related to a system call . print a message and return. */ 132 void err_msg(const char *fmt,...) 133 { 134 va_list ap; 135 136 va_start(ap, fmt); 137 err_doit(0, fmt, ap); 138 va_end(ap); 139 140 return; 141 } 142 /* Fatal error related to a system call . print a message and terminate. */ 143 void err_quit(const char *fmt,...) 144 { 145 va_list ap; 146 va_start(ap, fmt); 147 err_doit(0, fmt, ap); 148 va_end(ap); 149 exit(1); 150 } 151 /* print a message and return to caller. caller specifies "errnoflag". */ 152 static void err_doit(int errnoflag, const char *fmt, va_list ap) 153 { 154 int errno_save; 155 char buf[MAXLINE]; 156 157 errno_save = errno; /* value caller might want printed */ 158 vsprintf(buf, fmt, ap); 159 160 if (errnoflag) 161 sprintf(buf+strlen(buf),": %s", strerror(errno_save)); 162 163 strcat(buf, "\n"); 164 fflush(stdout); /* in case stdout and stderr are the same */ 165 fputs(buf, stderr); 166 fflush(NULL); /*flushes and stdio output streams */ 167 168 return; 169 }
