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implement flockfile api, rework stdio locking

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This commit is contained in:
Rich Felker 2011-03-12 21:55:45 -05:00
commit 5eb0d33ec0
9 changed files with 66 additions and 15 deletions
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19
src/internal/stdio_impl.h
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@ -23,8 +23,8 @@
#define UNGET 4
#define FLOCK(f) LOCK(&f->lock)
#define FUNLOCK(f) UNLOCK(&f->lock)
#define FLOCK(f) ((libc.lockfile && (f)->owner>=0) ? (libc.lockfile((f)),0) : 0)
#define FUNLOCK(f) ((f)->lockcount && (--(f)->lockcount || ((f)->owner=(f)->lock=0)))
#define F_PERM 1
#define F_NORD 4
@ -50,7 +50,7 @@ struct __FILE_s {
signed char lbf;
int lock;
int lockcount;
void *owner;
void *dummy5;
off_t off;
int (*flush)(FILE *);
void **wide_data; /* must be NULL */
@ -59,6 +59,7 @@ struct __FILE_s {
off_t (*seek)(FILE *, off_t, int);
int mode;
int (*close)(FILE *);
int owner;
};
size_t __stdio_read(FILE *, unsigned char *, size_t);
@ -80,15 +81,9 @@ int __putc_unlocked(int, FILE *);
FILE *__fdopen(int, const char *);
extern struct ofl
{
FILE *head;
int lock;
} __ofl;
#define OFLLOCK() LOCK(&__ofl.lock)
#define OFLUNLOCK() UNLOCK(&__ofl.lock)
#define ofl_head (__ofl.head)
#define OFLLOCK() LOCK(&libc.ofl_lock)
#define OFLUNLOCK() UNLOCK(&libc.ofl_lock)
#define ofl_head (libc.ofl_head)
#define feof(f) ((f)->flags & F_EOF)
#define ferror(f) ((f)->flags & F_ERR)