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862天前/* pipedemo.c * |
* 创建管道并使用管道来向自己发送数据 |
*/ |
#include <stdio.h> |
#include <unistd.h> |
main() |
{ |
int len, i, apipe[2]; /* two file descriptors */ |
char buf[BUFSIZ]; /* for reading end */ |
/* get a pipe */ |
if ( pipe ( apipe ) == -1 ){ |
perror("could not make pipe"); |
exit(1); |
} |
printf("Got a pipe! It is file descriptors: { %d %d }\n", |
apipe[0], apipe[1]); |
/* read from stdin, write into pipe, read from pipe, print */ |
while ( fgets(buf, BUFSIZ, stdin) ){ |
len = strlen( buf ); |
if ( write( apipe[1], buf, len) != len ){ /* send */ |
perror("writing to pipe"); /* down */ |
break; /* pipe */ |
} |
for ( i = 0 ; i<len ; i++ ) /* wipe */ |
buf[i] = 'X' ; |
len = read( apipe[0], buf, BUFSIZ ) ; /* read */ |
if ( len == -1 ){ /* from */ |
perror("reading from pipe"); /* pipe */ |
break; |
} |
if ( write( 1 , buf, len ) != len ){ /* send */ |
perror("writing to stdout"); /* to */ |
break; /* stdout */ |
} |
} |
} |
