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Commit7c1fcec

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committed
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1 parentbb17928 commit7c1fcec

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3 files changed

+135
-1
lines changed

3 files changed

+135
-1
lines changed

‎63/fatal.h‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
1+
#include<stdio.h>
2+
#include<stdlib.h>
3+
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#defineError(Str) FatalError(Str)
5+
#defineFatalError(Str) fprintf(stderr, "%s\n", Str);exit(1)

‎63/poll_pipes.c‎

Lines changed: 67 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,67 @@
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#include<time.h>
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#include<poll.h>
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#include<stdio.h>
4+
#include<stdlib.h>
5+
#include<string.h>
6+
#include<unistd.h>
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#include"fatal.h"
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9+
intmain(intargc,char*argv[]){
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intnumPipes,j,ready,randPipe,numWrites;
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int (*pfds)[2];
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structpollfd*pollFd;
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if(argc<2||strcmp(argv[1],"--help")==0){
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printf("%s num-pipes [num-writes]\n",argv[0]);
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exit(EXIT_FAILURE);
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}
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numPipes=atol(argv[1]);
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pfds=calloc(numPipes,sizeof(int [2]));
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if(pfds==NULL){
22+
FatalError("malloc");
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}
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pollFd=calloc(numPipes,sizeof(structpollfd));
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if(pollFd==NULL){
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FatalError("malloc");
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}
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29+
for(j=0;j<numPipes;j++){
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if(pipe(pfds[j])==-1){
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printf("pipe %d",j);
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exit(EXIT_FAILURE);
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}
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}
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numWrites= (argc>2) ?atoi(argv[2]) :1;
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srandom((int)time(NULL));
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for(j=0;j<numWrites;j++){
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randPipe=random() %numPipes;
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printf("Writing to fd: %3d (read fd: %3d)\n",pfds[randPipe][1],pfds[randPipe][0]);
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if(write(pfds[randPipe][1],"a",1)==-1){
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printf("write %d",pfds[randPipe][1]);
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exit(EXIT_FAILURE);
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}
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}
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for(j=0;j<numPipes;j++){
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pollFd[j].fd=pfds[j][0];
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pollFd[j].events=POLLIN;
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}
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ready=poll(pollFd,numPipes,-1);
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if(ready==-1){
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FatalError("poll");
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}
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printf("poll() returned: %d\n",ready);
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for(j=0;j<numPipes;j++){
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if(pollFd[j].revents&POLLIN){
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printf("Readable: %d %3d\n",j,pollFd[j].fd);
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}
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}
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exit(EXIT_SUCCESS);
67+
}

‎63/t_select.c‎

Lines changed: 63 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,9 @@
11
#include<sys/time.h>
22
#include<sys/select.h>
33
#include<stdio.h>
4-
#incldue <stdlib.h>
4+
#include<stdlib.h>
5+
#include"fatal.h"
6+
#include<string.h>
57

68
staticvoidusageError(constchar*progName){
79
fprintf(stderr,"Usage: %s {timeout|-} fd-num[rw]...\n",progName);
@@ -11,3 +13,63 @@ static void usageError(const char *progName){
1113
fprintf(stderr," e.g.: %s - 0rw 1w\n",progName);
1214
exit(EXIT_FAILURE);
1315
}
16+
17+
intmain(intargc,char*argv[]){
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fd_setreadfds,writefds;
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intready,nfds,fd,numRead,j;
20+
structtimevaltimeout;
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structtimeval*pto;
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charbuf[10];
23+
24+
if(argc<2||strcmp(argv[1],"--help")==0){
25+
usageError(argv[0]);
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}
27+
28+
if(strcmp(argv[1],"-")==0){
29+
pto=NULL;
30+
}else{
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pto=&timeout;
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timeout.tv_sec=atol(argv[1]);
33+
timeout.tv_usec=0;
34+
}
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36+
nfds=0;
37+
FD_ZERO(&readfds);
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FD_ZERO(&writefds);
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40+
for(j=2;j<argc;j++){
41+
numRead=sscanf(argv[j],"%d%2[rw]",&fd,buf);
42+
if(numRead!=2){
43+
usageError(argv[0]);
44+
}
45+
if(fd>=FD_SETSIZE){
46+
printf("file descriptor exceeds limit (%d)\n",FD_SETSIZE);
47+
exit(1);
48+
}
49+
50+
if(fd>=nfds){
51+
nfds=fd+1;
52+
}
53+
if(strchr(buf,'r')!=NULL){
54+
FD_SET(fd,&readfds);
55+
}
56+
if(strchr(buf,'w')!=NULL){
57+
FD_SET(fd,&writefds);
58+
}
59+
}
60+
61+
ready=select(nfds,&readfds,&writefds,NULL,pto);
62+
if(ready==-1){
63+
FatalError("select");
64+
}
65+
printf("ready = %d\n",ready);
66+
for(fd=0;fd<nfds;fd++){
67+
printf("%d: %s%s\n",fd,FD_ISSET(fd,&readfds)?"r":"",FD_ISSET(fd,&writefds)?"w":"");
68+
}
69+
70+
if(pto!=NULL){
71+
printf("timeout after select(): %ld.%03ld\n", (long)timeout.tv_sec, (long)timeout.tv_usec/10000);
72+
73+
exit(EXIT_SUCCESS);
74+
}
75+
}

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