4
我想在Linux上使用(Unix 98風格)僞tty接收(並稍後處理)write(1)
和wall(1)
消息。 我已經有以下最小實現:從pty讀取
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <utempter.h>
#define BUF_LENGTH 1024
int
main (void)
{
FILE *lf;
int masterfd, slavefd;
char *slave_name = NULL;
char buf[BUF_LENGTH];
size_t nbytes = sizeof(buf);
ssize_t bytes_read;
int exit_code = EXIT_SUCESS;
if ((masterfd = posix_openpt (O_RDWR | O_NOCTTY)) == -1
|| grantpt (masterfd) == -1
|| unlockpt (masterfd) == -1
|| (slave_name = ptsname (masterfd)) == NULL)
exit (EXIT_FAILURE);
if (!(lf = fopen("term.log","w")))
exit (EXIT_FAILURE);
addToUtmp (slave_name, NULL, masterfd);
for (;;)
{
bytes_read = read(masterfd, buf, nbytes);
if (bytes_read <= 0)
break
fwrite (buf, 1, bytes_read, lf);
}
if (bytes_read < 0)
{
fprintf (stderr, "error reading from master pty: %s\n", strerror (errno));
exit_code = EXIT_FAILURE;
}
fclose (lf);
if (slavefd >= 0)
close (slavefd);
if (masterfd >= 0)
{
removeLineFromUtmp (slave_name, masterfd);
close (masterfd);
}
exit (exit_code);
}
的問題是,現在它僅適用於讀的第一條消息,然後讀給我一個EIO錯誤。這是爲什麼?
D'哦,我一定是不小心刪除了開行試驗時(如您注意到fd變量和清理已經在那裏)。非常感謝,另一雙眼睛有時可以非常有幫助:) – gber 2010-06-04 16:54:55