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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,26 +1,26 @@ | ||
| #include "apue.h" | ||
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| int main() { | ||
| int int1, int2; | ||
| char line[MAXLINE]; | ||
| int int1, int2; | ||
| char line[MAXLINE]; | ||
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|
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| if (setvbuf(stdin, NULL, _IOLBF, 0) != 0) { | ||
| err_sys("setvbuf error"); | ||
| } | ||
| if (setvbuf(stdout, NULL, _IOLBF, 0) != 0) { | ||
| err_sys("setvbuf error"); | ||
| } | ||
| if (setvbuf(stdin, NULL, _IOLBF, 0) != 0) { | ||
| err_sys("setvbuf error"); | ||
| } | ||
| if (setvbuf(stdout, NULL, _IOLBF, 0) != 0) { | ||
| err_sys("setvbuf error"); | ||
| } | ||
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| while (fgets(line, MAXLINE, stdin) != NULL) { | ||
| if (sscanf(line, "%d%d", &int1, &int2) == 2) { | ||
| if (printf("%d\n", int1 + int2) == EOF) { | ||
| err_sys("printf error"); | ||
| } | ||
| } else { | ||
| if (printf("invalid args\n") == EOF) { | ||
| err_sys("printf error"); | ||
| } | ||
| while (fgets(line, MAXLINE, stdin) != NULL) { | ||
| if (sscanf(line, "%d%d", &int1, &int2) == 2) { | ||
| if (printf("%d\n", int1 + int2) == EOF) { | ||
| err_sys("printf error"); | ||
| } | ||
| } else { | ||
| if (printf("invalid args\n") == EOF) { | ||
| err_sys("printf error"); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| exit(0); | ||
| exit(0); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| #include <sys/wait.h> | ||
| #include "apue.h" | ||
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| #define DEF_PAGER "/bin/more" | ||
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| int main(int argc, char *argv[]) { | ||
| int n; | ||
| int fd[2]; | ||
| pid_t pid; | ||
| char *pager, *argv0; | ||
| char line[MAXLINE]; | ||
| FILE *fp; | ||
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| if (argc != 2) { | ||
| err_quit("usage: a.out <pathname>"); | ||
| } | ||
|
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| if ((fp = fopen(argv[1], "r")) == NULL) { | ||
| err_sys("can't open %s", argv[1]); | ||
| } | ||
| if (pipe(fd) < 0) { | ||
| err_sys("pipe error"); | ||
| } | ||
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| if ((pid = fork()) < 0) { | ||
| err_sys("fork error"); | ||
| } else if (pid > 0) { | ||
| close(fd[0]); | ||
|
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| while (fgets(line, MAXLINE, fp) != NULL) { | ||
| n = strlen(line); | ||
| if (write(fd[1], line, n) != n) { | ||
| err_sys("write error to pipe"); | ||
| } | ||
| } | ||
| if (ferror(fp)) { | ||
| err_sys("fgets error"); | ||
| } | ||
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| // close(fd[1]); | ||
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| if (waitpid(pid, NULL, 0) < 0) { | ||
| err_sys("waitpid error"); | ||
| } | ||
| exit(0); | ||
| } else { | ||
| close(fd[1]); | ||
| if (fd[0] != STDIN_FILENO) { | ||
| if (dup2(fd[0], STDIN_FILENO) != STDIN_FILENO) { | ||
| err_sys("dup2 error to stdin"); | ||
| } | ||
| close(fd[0]); | ||
| } | ||
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| if ((pager = getenv("PAGER")) == NULL) { | ||
| pager = DEF_PAGER; | ||
| } | ||
| if ((argv0 = strrchr(pager, '/')) != NULL) { | ||
| argv0++; | ||
| } else { | ||
| argv0 = pager; | ||
| } | ||
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| if (execl(pager, argv0, (char *)0) < 0) { | ||
| err_sys("excel error for %s", pager); | ||
| } | ||
| } | ||
| exit(0); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| #include "apue.h" | ||
| #include <fcntl.h> | ||
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| #define FIFO "temp.fifo" | ||
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| int main() { | ||
| int fdread, fdwrite; | ||
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| unlink(FIFO); | ||
| if (mkfifo(FIFO, FILE_MODE) < 0) { | ||
| err_sys("mkfifo error"); | ||
| } | ||
| if ((fdread = open(FIFO, O_RDONLY | O_NONBLOCK)) < 0) { | ||
| err_sys("open error for reading"); | ||
| } | ||
| if ((fdwrite = open(FIFO, O_WRONLY)) < 0) { | ||
| err_sys("open error for writing"); | ||
| } | ||
| clr_fl(fdread, O_NONBLOCK); | ||
| exit(0); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| #include <errno.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <sys/msg.h> | ||
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| int main() { | ||
| int i, id; | ||
| char *hello = "Hello World!\n"; | ||
| for (i = 0; i < 5; i++) { | ||
| if ((id = msgget(0, IPC_CREAT)) == -1) { | ||
| printf("msgget error\n"); | ||
| exit(1); | ||
| } | ||
| printf("id = %d\n", id); | ||
| if (msgctl(id, IPC_RMID, NULL) == -1) { | ||
| printf("msgctl IPC_RMID error\n"); | ||
| exit(1); | ||
| } | ||
| } | ||
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| printf("\n\n"); | ||
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| for (i = 0; i < 5; i++) { | ||
| if ((id = msgget(IPC_PRIVATE, 0)) == -1) { | ||
| printf("msgget error\n"); | ||
| exit(1); | ||
| } | ||
| printf("id = %d\n", id); | ||
| if (msgsnd(id, hello, 0, IPC_NOWAIT) == -1) { | ||
| printf("%s\n", strerror(errno)); | ||
| printf("msgsnd error\n"); | ||
| exit(1); | ||
| } | ||
| } | ||
| exit(0); | ||
| } |
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