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fopencookie.3: Fix bugs in example 

fread(3), unlike read(2) which returns a ssize_t, returns a
size_t.  It doesn't distinguish between error and enf-of-file.
Instead, either ferror(3) or feof(3) need to be checked if fread()
returned 0.

Signed-off-by: Alejandro Colomar <colomar.6.4.3@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Alejandro Colomar 2020-09-07 12:21:17 +02:00 committed by Michael Kerrisk
parent a1eb1a6a33
commit a3eeca342d
1 changed files with 5 additions and 5 deletions
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10
man3/fopencookie.3
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@ -392,7 +392,7 @@ main(int argc, char *argv[])
};
FILE *stream;
struct memfile_cookie mycookie;
ssize_t nread;
size_t nread;
char buf[1000];
/* Set up the cookie before calling fopencookie() */
@ -429,11 +429,11 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
nread = fread(buf, 1, 2, stream);
if (nread == \-1) {
perror("fread");
exit(EXIT_FAILURE);
}
if (nread == 0) {
if (ferror(stream) != 0) {
fprintf(stderr, "fread failed\en");
exit(EXIT_FAILURE);
}
printf("Reached end of file\en");
break;
}