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libc/stdio: Add stdio file locking functions

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Add flockfile(), ftrylockfile() and funlockfile() functions [1].

[1] POSIX.1-2008 / System Interfaces / flockfile
    https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/functions/flockfile.html

Signed-off-by: Miguel Herranz <miguel@midokura.com>
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Miguel Herranz
2022-04-25 18:13:41 +02:00
committed by Xiang Xiao
parent 19d1e08717
commit 819ebe7356
19 changed files with 57 additions and 69 deletions
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Documentation/reference/user/10_filesystem.rst
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@@ -268,6 +268,7 @@ Standard I/O
int fgetc(FAR FILE *stream);
int fgetpos(FAR FILE *stream, FAR fpos_t *pos);
FAR char *fgets(FAR char *s, int n, FAR FILE *stream);
void flockfile(FAR FILE *stream);
FAR FILE *fopen(FAR const char *path, FAR const char *type);
int fprintf(FAR FILE *stream, FAR const char *format, ...);
int fputc(int c, FAR FILE *stream);
@@ -278,6 +279,8 @@ Standard I/O
int fseek(FAR FILE *stream, long int offset, int whence);
int fsetpos(FAR FILE *stream, FAR fpos_t *pos);
long ftell(FAR FILE *stream);
int ftrylockfile(FAR FILE *stream);
void funlockfile(FAR FILE *stream);
size_t fwrite(FAR const void *ptr, size_t size, size_t n_items, FAR FILE *stream);
FAR char *gets(FAR char *s);
FAR char *gets_s(FAR char *s, rsize_t n);