| Summary: | fclose() doesn't flush the output as it should be | ||
|---|---|---|---|
| Product: | glibc | Reporter: | abdulrahman mahmoud <abdulrahman.mahmoud75> |
| Component: | stdio | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED INVALID | ||
| Severity: | normal | CC: | drepper.fsp, fweimer |
| Priority: | P2 | Flags: | fweimer:
security-
|
| Version: | 2.28 | ||
| Target Milestone: | --- | ||
| See Also: | https://sourceware.org/bugzilla/show_bug.cgi?id=1190 | ||
| Host: | Target: | ||
| Build: | Last reconfirmed: | ||
This is because EOF is now sticky, see commit 2cc7bad0ae. You need to call fseek or clearerr before you can read more from a changing file. (In reply to Andreas Schwab from comment #1) > This is because EOF is now sticky, see commit 2cc7bad0ae. You need to call > fseek or clearerr before you can read more from a changing file. Thanks Andreas, i have called clearerr and it solved the issue. |
I have created a mini example to test the fgets() utility but when i run this example i don't see any output in the shell, below is my example: #include <stdio.h> int main () { FILE *fp, *fd_3, *fd_2; char str[60]; char str1[] = "writing to file "; char str2[] = "my file"; fp = fopen("file/test_fopen" , "w"); fclose(fp); fd_3 = fopen("file/test_fopen" , "r"); fp = fopen("file/test_fopen" , "a"); fwrite(str1 , 1 , sizeof(str1) , fp); if( fgets (str, 60, fd_3)!=NULL ) { puts(str); } fclose(fp); fd_2 = fopen("file/test_fopen" , "a"); fwrite(str2 , 1 , sizeof(str2) , fd_2); if( fgets (str, 60, fd_3)!=NULL ) { puts(str); } fclose(fd_2); return(0); } When i compile and run this code against glibc-2.17 i receive an output "writing to file" on the shell but when i compile against glibc-2.28, there is no output. So is this an expected behavior? is the way of flushing when calling fclose() changed between the two versions?