| Summary: | fgets get skipped after EOF | ||
|---|---|---|---|
| Product: | glibc | Reporter: | pascal.liedtke |
| Component: | stdio | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED INVALID | ||
| Severity: | critical | CC: | fweimer |
| Priority: | P2 | Flags: | fweimer:
security-
|
| Version: | 2.29 | ||
| Target Milestone: | --- | ||
| See Also: | https://sourceware.org/bugzilla/show_bug.cgi?id=1190 | ||
| Host: | Target: | ||
| Build: | Last reconfirmed: | ||
This is correct behaviour. EOF is supposed to be sticky, see commit 2cc7bad0ae. |
Here a sample code: #include <stdio.h> int main() { char input[80]; while (fgets(input, 80, stdin) != NULL) { // nop } fgets(input, 80, stdin); printf("%s\n", input); return 0; } After sending EOF to exit the loop, the second fgets returns immediately return NULL, no second input possible. Compiling on 2.27 works as expected. Compiling on a 2.27 system with -static and executing on a 2.29 System also works. I have no more glibc versions to check more. Only can say bugged on 2.29, works on 2.27.