Bien, funciona cuando hay un espacio. No funciona bien si no lo hay espacios o hay dos. 23/25

Transcription

1 Javiera Quiroz P1 #!/bin/bash find $1 -name *.class > /tmp/t1$$ find $1 -name.o > > /tmp/t2$$ /* Ojo que >> no lleva espacio IFS=" " while read uno dos do rm -f $uno\ $dos done < /tmp/t1$$ while read tres cuatro do rm -f $tres\ $cuatro done < /tmp/t2$$ rm /tmp/t1$$ rm /tmp/t2$$ Bien, funciona cuando hay un espacio. No funciona bien si no lo hay espacios o hay dos. 23/25 P2 #include <signal.h> #include <stdio.h> #include <unistd.h> /* for write #include <stdlib.h> /* for exit #include <errno.h> /* for EINTR static void sig_int(int); #define MAXLINE 200 void err_sys(char * msg) printf("%s \n", msg); exit(-1); int main(void) int n; char line[maxline]; extern int errno; struct sigaction act; if (signal(sigint, sig_int) == SIG_ERR) return(2); pause(); /* next caught signal wakes us up return( 1 ); /* turn off timer, return unslept time static void sig_int(int signo) sleep(2); printf("llegó Control-C.\n"); return; /* nothing to do, just return to interrupt the read

2 /* Si llega otra señal igual terminará la pausa y el programa. El comentario del return 1 no corresponde Define variables que no usa 20/25 P3 #include <sys/types.h> #include <unistd.h> #include <stdio.h> #include <string.h> #include <stdlib.h> int main(int argc, char *argv[]) //Uno para el du y otro para el scilab pid_t pidbc; int pfdbc[2]; int status; char s[100]; FILE *sd; // Aquí debió crear la pipa!!! if ((pidbc = fork()) < 0) perror("fork bc"); exit(1); //Codigo del Hijo scilab if (pidbc == 0) //Se conecta la entrada estandar del bc a la pipa con el padre dup2(pfdbc[0], 0); // Pero no creó la pipa! //Se cierra la pipa de lectura close(pfdbc[1]); //Se invoca a scilab execlp("bc","bc","-q",null); perror("exec bc"); exit(1); close(pfdbc[0]); sd = fdopen(pfdbc[1], "a"); /* to use fprintf instead of just write // Se envían los datos del histograma obtenidos por el programa principal //al scilab do scanf("%s",s); if(strcmp(s,"\0")!=0 ) fprintf(sd, "%s\n", &s); // s es string, no usar & fflush(sd); if(strcmp(s,"quit") == 0)

3 fprintf(sd,"quit"); // de más ya escribió esto fflush(sd); break; while(strcmp(s,"quit") == 0); // error en condición. Debió decir!=0 /* Wait for the child to exit and * close de pipe. waitpid(pidbc, &status, 0); fclose(sd); exit(0); 18/25 P4 /* Our own header, to be included before all standard system headers #ifndef _APUE_H #define _APUE_H #if defined(solaris) #define _XOPEN_SOURCE 500 /* Single UNIX Specification, Version 2 for Solaris 9 #define CMSG_LEN(x) _CMSG_DATA_ALIGN(sizeof(struct cmsghdr)+(x)) #elif!defined(bsd) #define _XOPEN_SOURCE 600 /* Single UNIX Specification, Version 3 #include <sys/types.h> /* some systems still require this #include <sys/stat.h> #include <sys/termios.h> /* for winsize #ifndef TIOCGWINSZ #include <sys/ioctl.h> #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

4 #if defined(sig_ign) &&!defined(sig_err) #define SIG_ERR ((Sigfunc *)-1) #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 long 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 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 void daemonize(const char *); /* Prog daemoninit int s_pipe(int *); /* Progs streams_spipe sock_spipe int recv_fd(int, ssize_t (*func)(int, const void *, size_t));/* Progs recvfd_streams recvfd_sockets int send_fd(int, int); /* Progs sendfd_streams sendfd_sockets int send_err(int, int, const char *); /* Prog senderr int serv_listen(const char *); /* Progs servlisten_streams servlisten_sockets int serv_accept(int, uid_t *); /* Progs servaccept_streams servaccept_sockets int cli_conn(const char *); /* Progs cliconn_streams cliconn_sockets int buf_args(char *, int (*func)(int, char **)); /* Prog bufargs int ptym_open(char *, int); /* Progs3 ptyopen_streams ptyopen_bsd ptyopen_linux int ptys_open(char *); /* Progs3 ptyopen_streams ptyopen_bsd ptyopen_linux #ifdef TIOCGWINSZ pid_t pty_fork(int *, char *, int, const struct termios *, const struct winsize *); /* Prog ptyfork 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))

5 #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_dump(const char *,...); /* App misc_source void err_msg(const char *,...); void err_quit(const char *,...); void err_exit(int, 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_conditions void TELL_PARENT(pid_t); void TELL_CHILD(pid_t); void WAIT_PARENT(void); void WAIT_CHILD(void); /* _APUE_H ================================== #include "apue.h" #include <pthread.h> pthread_t ntid; void printids(const char *s) pid_t pid; pthread_t tid; pid = getpid(); tid = pthread_self(); printf("%s pid %u tid %u (0x%x)\n", s, (unsigned int)pid, (unsigned int)tid, (unsigned int)tid); void * thr_fn(void *arg) printids("new thread: "); return((void *)0);

6 int main(void) int err; err = pthread_create(&ntid, NULL, thr_fn, NULL); if (err!= 0) /* err_quit("can't create thread: %s\n", strerror(err));; printids("main thread:"); sleep(1); exit(0); 02/25