06.进程和线程编程之三

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【代码1】test_alarm.c

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <errno.h>#include <sys/types.h>#include <signal.h>int main(int argc, char *argv[]){alarm(1);pause();exit(0);}

【代码2】test_kill_raise.c

#include "header.h"void handler(int sig){printf("%d\n", sig);}int main(int argc, char *argv[]){pid_t pid;if (0 > (pid = fork()))err_exit("fork");else if (pid == 0) {sleep(1);//kill(getppid(), 11);raise(11);} else {signal(17, SIG_IGN);sleep(15);}exit(0);}

【代码3】test_mysleep.c

#include "header.h"void handler(int sig){printf("in handler...\n");}int main(int argc, char *argv[]){signal(14, handler);if (argc < 2) {fprintf(stderr, "Usage : %s + seconds\n", argv[0]);exit(1);}int sec;if (0 >= (sec = atoi(argv[1]))) {fprintf(stderr, "the seconds is invalid!\n");exit(1);}alarm(sec);pause();printf("after pause...\n");exit(0);}

【代码4】test_pipe.c

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <unistd.h>int main(int argc, char *argv[]){int fd[2] = {-1, -1};if (0 > pipe(fd)) {fprintf(stderr, "pipe : %s\n", strerror(errno));exit(1);}//printf("fd0, fd1 is %d %d\n", fd[0], fd[1]);pid_t pid;if (0 > (pid = fork())) {fprintf(stderr, "fork : %s\n", strerror(errno));exit(1);} else if (pid == 0) {close(fd[0]);char buf[128];while(1) {fgets(buf, sizeof(buf), stdin);write(fd[1], buf, strlen(buf) + 1);}} else {close(fd[1]);char buf[128];int ret;while(1) {ret = read(fd[0],buf, sizeof(buf));printf("read : %d -> %s", ret, buf);}}exit(0);}

【代码5】test_pipe_size.c

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <unistd.h>int main(int argc, char *argv[]){int fd[2];pid_t pid;if (0 > pipe(fd)) {fprintf(stderr, "pipe : %s\n", strerror(errno));exit(1);}char buf[1024];int ret;int sum = 0;while(1) {ret = write(fd[1], buf, sizeof(buf));sum+=ret;printf("sum is %d\n", sum);}exit(0);}

【代码6】test_read_fifo.c

#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#define MYFIFO "myfifo"int main(int argc, char *argv[]){if (0 > mkfifo(MYFIFO, 0666)) {if (EEXIST == errno)fprintf(stderr, "fifo exist!\n");else {fprintf(stderr, "mkfifo : %s\n", strerror(errno));exit(1);}}int fd = -1;if (0 > (fd = open(MYFIFO, O_RDONLY))) {fprintf(stderr, "open : %s\n", strerror(errno));exit(1);}char buf[128];int ret;while(1) {ret = read(fd, buf, sizeof(buf));if (ret == 0) {printf("write terminal close!\n");break;}printf("read : %s", buf);}close(fd);exit(0);}

【代码7】test_write_fifo.c

#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#define MYFIFO "myfifo"int main(int argc, char *argv[]){if (0 > mkfifo(MYFIFO, 0666)) {if (EEXIST == errno)fprintf(stderr, "fifo exist!\n");else {fprintf(stderr, "mkfifo : %s\n", strerror(errno));exit(1);}}int fd = -1;if (0 > (fd = open(MYFIFO, O_WRONLY))) {fprintf(stderr, "open : %s\n", strerror(errno));exit(1);}char buf[128];while(1) {fgets(buf, sizeof(buf), stdin);write(fd, buf, strlen(buf) + 1);}close(fd);exit(0);}