p9-5-6.c

SUN Solaris8平台下进程间通信

#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#define MAX_PASS_LEN 8
char * getpass(const char *prompt)     
{
    struct termios oldterm,newterm;
    static char passwd[MAX_PASS_LEN+1];
    char   *ptr ;
    FILE   *fp;
    int    echo_off, c;
    /* 为读写打开终端 */
    if((fp = fopen(ctermid(NULL), "w+")) == NULL)
        return NULL;
    /* 保存终端当前设置 */
    tcgetattr(fileno(fp), &oldterm);
    newterm = oldterm;
    /* 关闭回显和忽略终端生成的信号 */
    newterm.c_lflag &= ~(ECHO | ISIG);
    echo_off = tcsetattr(fileno(fp), TCSAFLUSH, &newterm) == 0;
    /* 提示请求口令 */
    fputs(prompt, fp);
    /* 读入口令 */
    ptr = passwd;
    while ((c = getc(fp)) != EOF && c != '\n') 
        if (ptr < &passwd[MAX_PASS_LEN])
            *ptr++ = c;     
    *ptr = 0;                   /* 用null结尾 */
    putc('\n', fp);             /* 回显一换行 */
    /* 恢复终端原设置 */
    tcsetattr(fileno(fp), TCSAFLUSH, &oldterm);
    fclose(fp);                   /* 关闭终端文件 */
    return passwd;
}
int main(void)
{
    char *ptr;
    ptr = getpass("Enter password:");
    printf( "You entered: %s\n",ptr);
    exit(0);
}