CODEWITHSUNDEEP
cprintfsegmentation-faultfault
paulyks
paulyks

Reputation: 15

Segmentation fault when printf %s is called

There is a tiny part of my code in C.

read(fd,&bufferSize,sizeof(bufferSize);
buffer = malloc(bufferSize);
read(fd,&buffer,bufferSize);
printf("%d",buffer);
fflush(stdout);
printf("%s",buffer);
fflush(stdout);

When I print buffer with %d format, it's working, but when I try to consider the buffer as a string, I get segmentation fault. SIGSEGV occurs even when I use strcmp or other functions like that.

Upvotes: 0

Views: 162

Answers (1)

Qwertycrackers
Qwertycrackers

Reputation: 666

read(fd,&buffer,bufferSize);

Here, buffer is the address of the start of your buffer. So, when you call the above function, you as passing in the address of your address.

Thus, you can see why it segfaults, because the address passed in is not the actual address of the buffer. Replace that line with

read(fd,buffer,bufferSize);

Upvotes: 3

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