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example: refactor poll_client to remove FSEL_FILES macro

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Replace the FSEL_FILES macro and explicit char array with a string
literal for hex_map, deriving the file count from sizeof. Use size_t
for loop variables and fix the printf format specifier accordingly.

Signed-off-by: wangrzneu <wangrzneu@gmail.com>
This commit is contained in:
wangrzneu
2026-03-28 09:17:56 +08:00
committed by Bernd Schubert
parent 031f37db7e
commit 22d0fcd4c7
1 changed files with 11 additions and 11 deletions
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example/poll_client.c
+11 -11
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@@ -31,15 +31,15 @@
#include <stdlib.h>
#include <errno.h>
#define FSEL_FILES 16
int main(void)
{
static const char hex_map[FSEL_FILES] = "0123456789ABCDEF";
int fds[FSEL_FILES];
int i, nfds, tries;
static const char hex_map[] = "0123456789ABCDEF";
const size_t fsel_files = sizeof(hex_map) - 1;
int fds[sizeof(hex_map) - 1];
size_t i, tries;
int nfds;
for (i = 0; i < FSEL_FILES; i++) {
for (i = 0; i < fsel_files; i++) {
char name[] = { hex_map[i], '\0' };
fds[i] = open(name, O_RDONLY);
if (fds[i] < 0) {
@@ -47,15 +47,15 @@ int main(void)
return 1;
}
}
nfds = fds[FSEL_FILES - 1] + 1;
nfds = fds[fsel_files - 1] + 1;
for(tries=0; tries < 16; tries++) {
for (tries = 0; tries < fsel_files; tries++) {
static char buf[4096];
fd_set rfds;
int rc;
FD_ZERO(&rfds);
for (i = 0; i < FSEL_FILES; i++)
for (i = 0; i < fsel_files; i++)
FD_SET(fds[i], &rfds);
rc = select(nfds, &rfds, NULL, NULL, NULL);
@@ -65,12 +65,12 @@ int main(void)
return 1;
}
for (i = 0; i < FSEL_FILES; i++) {
for (i = 0; i < fsel_files; i++) {
if (!FD_ISSET(fds[i], &rfds)) {
printf("_: ");
continue;
}
printf("%X:", i);
printf("%zX:", i);
rc = read(fds[i], buf, sizeof(buf));
if (rc < 0) {
perror("read");