APUE 1-10 从标准输入读命令并执行

1-10.c
#include "apue.h"
#include "my_err.h"
#include <sys/wait.h>

static void sig_int(int);

int main()
{
char buf[MAXLINE];
pid_t pid;
int status;

if (signal(SIGINT, sig_int) == SIG_ERR)
err_sys("signal errort");

printf ("%%  ");
while (fgets(buf, MAXLINE, stdin) != NULL) {
if (buf[strlen(buf) -1] == '\n')
buf[strlen(buf) - 1] = 0;

if ((pid = fork()) < 0) {
err_sys("fork error");
} else if (pid == 0) {
execlp(buf, buf, (char *)0);
err_ret("couldn't execute: %s", buf);
exit(127);
}

if ((pid = waitpid(pid, &status, 0)) < 0)
err_sys("waitpid error");
printf("%% ");
}
exit(0);
}

void sig_int(int signao)
{
printf("interrupt\n%% ");
}

apue.h

/*
* Our own header, to be included before all standard system headers.
*/
#ifndef	_APUE_H
#define	_APUE_H

#define _POSIX_C_SOURCE 200809L

#if defined(SOLARIS)		/* Solaris 10 */
#define _XOPEN_SOURCE 600
#else
#define _XOPEN_SOURCE 700
#endif

#include <sys/types.h>		/* some systems still require this */
#include <sys/stat.h>
#include <sys/termios.h>	/* for winsize */
#if defined(MACOS) || !defined(TIOCGWINSZ)
#include <sys/ioctl.h>
#endif

#include <stdio.h>		/* for convenience */
#include <stdlib.h>		/* for convenience */
#include <stddef.h>		/* for offsetof */
#include <string.h>		/* for convenience */
#include <unistd.h>		/* for convenience */
#include <signal.h>		/* for SIG_ERR */

#define	MAXLINE	4096			/* max line length */

/*
* Default file access permissions for new files.
*/
#define	FILE_MODE	(S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)

/*
* Default permissions for new directories.
*/
#define	DIR_MODE	(FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH)

typedef	void	Sigfunc(int);	/* for signal handlers */

#define	min(a,b)	((a) < (b) ? (a) : (b))
#define	max(a,b)	((a) > (b) ? (a) : (b))

/*
* Prototypes for our own functions.
*/
char	*path_alloc(size_t *);				/* {Prog pathalloc} */
long	 open_max(void);					/* {Prog openmax} */

int		 set_cloexec(int);					/* {Prog setfd} */
void	 clr_fl(int, int);
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} */

void	 daemonize(const char *);			/* {Prog daemoninit} */

void	 sleep_us(unsigned int);			/* {Ex sleepus} */
ssize_t	 readn(int, void *, size_t);		/* {Prog readn_writen} */
ssize_t	 writen(int, const void *, size_t);	/* {Prog readn_writen} */

int		 fd_pipe(int *);					/* {Prog sock_fdpipe} */
int		 recv_fd(int, ssize_t (*func)(int,
const void *, size_t));	/* {Prog recvfd_sockets} */
int		 send_fd(int, int);					/* {Prog sendfd_sockets} */
int		 send_err(int, int,
const char *);			/* {Prog senderr} */
int		 serv_listen(const char *);			/* {Prog servlisten_sockets} */
int		 serv_accept(int, uid_t *);			/* {Prog servaccept_sockets} */
int		 cli_conn(const char *);			/* {Prog cliconn_sockets} */
int		 buf_args(char *, int (*func)(int,
char **));				/* {Prog bufargs} */

int		 tty_cbreak(int);					/* {Prog raw} */
int		 tty_raw(int);						/* {Prog raw} */
int		 tty_reset(int);					/* {Prog raw} */
void	 tty_atexit(void);					/* {Prog raw} */
struct termios	*tty_termios(void);			/* {Prog raw} */

int		 ptym_open(char *, int);			/* {Prog ptyopen} */
int		 ptys_open(char *);					/* {Prog ptyopen} */
#ifdef	TIOCGWINSZ
pid_t	 pty_fork(int *, char *, int, 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_read_lockable(fd, offset, whence, len) \
(lock_test((fd), F_RDLCK, (offset), (whence), (len)) == 0)
#define	is_write_lockable(fd, offset, whence, len) \
(lock_test((fd), F_WRLCK, (offset), (whence), (len)) == 0)

void	err_msg(const char *, ...);			/* {App misc_source} */
void	err_dump(const char *, ...) __attribute__((noreturn));
void	err_quit(const char *, ...) __attribute__((noreturn));
void	err_cont(int, const char *, ...);
void	err_exit(int, const char *, ...) __attribute__((noreturn));
void	err_ret(const char *, ...);
void	err_sys(const char *, ...) __attribute__((noreturn));

void	log_msg(const char *, ...);			/* {App misc_source} */
void	log_open(const char *, int, int);
void	log_quit(const char *, ...) __attribute__((noreturn));
void	log_ret(const char *, ...);
void	log_sys(const char *, ...) __attribute__((noreturn));
void	log_exit(int, const char *, ...) __attribute__((noreturn));

void	TELL_WAIT(void);		/* parent/child from {Sec race_conditions} */
void	TELL_PARENT(pid_t);
void	TELL_CHILD(pid_t);
void	WAIT_PARENT(void);
void	WAIT_CHILD(void);

#endif	/* _APUE_H */

my_err.h

/* * Our own header, to be included before all standard system headers. */ #ifndef _APUE_H #define _APUE_H #define _POSIX_C_SOURCE 200809L #if defined(SOLARIS) /* Solaris 10 */ #define _XOPEN_SOURCE 600 #else #define _XOPEN_SOURCE 700 #endif #include <sys/types.h> /* some systems still require this */ #include <sys/stat.h> #include <sys/termios.h> /* for winsize */ #if defined(MACOS) || !defined(TIOCGWINSZ) #include <sys/ioctl.h> #endif #include <stdio.h> /* for convenience */ #include <stdlib.h> /* for convenience */ #include <stddef.h> /* for offsetof */ #include <string.h> /* for convenience */ #include <unistd.h> /* for convenience */ #include <signal.h> /* for SIG_ERR */ #define MAXLINE 4096 /* max line length */ /* * Default file access permissions for new files. */ #define FILE_MODE (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) /* * Default permissions for new directories. */ #define DIR_MODE (FILE_MODE | S_IXUSR | S_IXGRP | S_IXOTH) typedef void Sigfunc(int); /* for signal handlers */ #define min(a,b) ((a) < (b) ? (a) : (b)) #define max(a,b) ((a) > (b) ? (a) : (b)) /* * Prototypes for our own functions. */ char *path_alloc(size_t *); /* {Prog pathalloc} */ long open_max(void); /* {Prog openmax} */ int set_cloexec(int); /* {Prog setfd} */ void clr_fl(int, int); 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} */ void daemonize(const char *); /* {Prog daemoninit} */ void sleep_us(unsigned int); /* {Ex sleepus} */ ssize_t readn(int, void *, size_t); /* {Prog readn_writen} */ ssize_t writen(int, const void *, size_t); /* {Prog readn_writen} */ int fd_pipe(int *); /* {Prog sock_fdpipe} */ int recv_fd(int, ssize_t (*func)(int, const void *, size_t)); /* {Prog recvfd_sockets} */ int send_fd(int, int); /* {Prog sendfd_sockets} */ int send_err(int, int, const char *); /* {Prog senderr} */ int serv_listen(const char *); /* {Prog servlisten_sockets} */ int serv_accept(int, uid_t *); /* {Prog servaccept_sockets} */ int cli_conn(const char *); /* {Prog cliconn_sockets} */ int buf_args(char *, int (*func)(int, char **)); /* {Prog bufargs} */ int tty_cbreak(int); /* {Prog raw} */ int tty_raw(int); /* {Prog raw} */ int tty_reset(int); /* {Prog raw} */ void tty_atexit(void); /* {Prog raw} */ struct termios *tty_termios(void); /* {Prog raw} */ int ptym_open(char *, int); /* {Prog ptyopen} */ int ptys_open(char *); /* {Prog ptyopen} */ #ifdef TIOCGWINSZ pid_t pty_fork(int *, char *, int, 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_read_lockable(fd, offset, whence, len) \ (lock_test((fd), F_RDLCK, (offset), (whence), (len)) == 0) #define is_write_lockable(fd, offset, whence, len) \ (lock_test((fd), F_WRLCK, (offset), (whence), (len)) == 0) void err_msg(const char *, ...); /* {App misc_source} */ void err_dump(const char *, ...) __attribute__((noreturn)); void err_quit(const char *, ...) __attribute__((noreturn)); void err_cont(int, const char *, ...); void err_exit(int, const char *, ...) __attribute__((noreturn)); void err_ret(const char *, ...); void err_sys(const char *, ...) __attribute__((noreturn)); void log_msg(const char *, ...); /* {App misc_source} */ void log_open(const char *, int, int); void log_quit(const char *, ...) __attribute__((noreturn)); void log_ret(const char *, ...); void log_sys(const char *, ...) __attribute__((noreturn)); void log_exit(int, const char *, ...) __attribute__((noreturn)); void TELL_WAIT(void); /* parent/child from {Sec race_conditions} */ void TELL_PARENT(pid_t); void TELL_CHILD(pid_t); void WAIT_PARENT(void); void WAIT_CHILD(void); #endif /* _APUE_H */