谁能告诉我这段代码有什么问题吗?
总之,它创建输入和输出管道,而 fork-exec 的sort
程序。家长读字典/usr/share/dict/words
并将其写入管道dup2()
'd to sort
的标准输入,同样,读取它的输出,将其打印到终端(父级的标准输出)。或者,至少,这就是应该发生的事情。
回溯表明父进程挂在read()
第 130 行(标有注释“XXX”)。几乎就像sort
不知道文件结尾,但关闭了写结尾pipeIn
应该“发出信号”,对吧?
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
int main(int argc, char** argv)
{
int pipeIn[2];
int pipeOut[2];
if ((pipe(pipeIn)) == -1)
{
perror("pipe");
exit(EXIT_FAILURE);
}
if ((pipe(pipeOut)) == -1)
{
perror("pipe");
exit(EXIT_FAILURE);
}
pid_t child = fork();
if (child == 0)
{
// This is child!
if ((dup2(pipeIn[0], STDIN_FILENO)) == -1)
{
perror("dup2");
exit(EXIT_FAILURE);
}
if ((dup2(pipeOut[1], STDOUT_FILENO)) == -1)
{
perror("dup2");
exit(EXIT_FAILURE);
}
if ((dup2(pipeOut[1], STDERR_FILENO)) == -1)
{
perror("dup2");
exit(EXIT_FAILURE);
}
if ((close(pipeIn[0])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
if ((close(pipeOut[1])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
if ((execlp("sort", "-r", NULL)) == -1)
{
perror("execlp");
exit(EXIT_FAILURE);
}
}
else if (child == -1)
{
perror("fork");
exit(EXIT_FAILURE);
}
else
{
// This is parent!
if ((close(pipeIn[0])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
if ((close(pipeOut[1])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
int dict = open("/usr/share/dict/words", O_RDONLY);
if (dict == -1)
{
perror("open");
exit(EXIT_FAILURE);
}
char buf[1024];
int count;
while ((count = read(dict, buf, sizeof(char) * 1024)) > 0)
{
putchar('.');
if ((write(pipeIn[1], buf, count)) == -1)
{
perror("write 1");
exit(EXIT_FAILURE);
}
}
if (count == -1)
{
perror("read");
exit(EXIT_FAILURE);
}
if ((close(dict)) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
if ((close(pipeIn[1])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
while ((count = read(pipeOut[0], buf, sizeof(char) * 1024)) > 0) // XXX
{
putchar('!');
if ((write(STDOUT_FILENO, buf, count)) == -1)
{
perror("write 2");
exit(EXIT_FAILURE);
}
}
if (count == -1)
{
perror("read");
exit(EXIT_FAILURE);
}
if ((close(pipeOut[0])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
}
return EXIT_SUCCESS;
}
感谢您的任何意见(请原谅双关语)。
您的问题是您没有在智利过程中关闭管道未使用的末端。所以你需要在之前的某个地方添加以下代码exec
if ((close(pipeIn[1])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
if ((close(pipeOut[0])) == -1)
{
perror("close");
exit(EXIT_FAILURE);
}
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