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posix: add posix_fadvise(), only error checks.

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should help for ports.

Change-Id: Id504bdb79cb68db4b615f58848e0e1a86ced8d2b
Reviewed-on: https://review.haiku-os.org/c/1467
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
This commit is contained in:
Jérôme Duval 2019-05-20 21:57:28 +02:00
parent 66cb2efaa8
commit 38ce902686
2 changed files with 30 additions and 0 deletions
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10
headers/posix/fcntl.h
View File

@ -67,6 +67,14 @@
#define AT_REMOVEDIR 0x04 /* unlinkat() */
#define AT_EACCESS 0x08 /* faccessat() */
/* file advisory information, unused by Haiku */
#define POSIX_FADV_NORMAL 0 /* no advice */
#define POSIX_FADV_SEQUENTIAL 1 /* expect sequential access */
#define POSIX_FADV_RANDOM 2 /* expect access in a random order */
#define POSIX_FADV_WILLNEED 3 /* expect access in the near future */
#define POSIX_FADV_DONTNEED 4 /* expect no access in the near future */
#define POSIX_FADV_NOREUSE 5 /* expect access only once */
/* advisory file locking */
struct flock {
@ -90,6 +98,8 @@ extern int openat(int fd, const char *path, int openMode, ...);
extern int fcntl(int fd, int op, ...);
extern int posix_fadvise(int fd, off_t offset, off_t len, int advice);
#ifdef __cplusplus
}
#endif

20
src/system/libroot/posix/fcntl.cpp
View File

@ -75,3 +75,23 @@ fcntl(int fd, int op, ...)
RETURN_AND_SET_ERRNO(error);
}
int
posix_fadvise(int fd, off_t offset, off_t len, int advice)
{
if (len < 0 || offset < 0 || advice < POSIX_FADV_NORMAL
|| advice > POSIX_FADV_NOREUSE) {
return EINVAL;
}
struct stat stat;
if (fstat(fd, &stat) < 0)
return EBADF;
if (S_ISFIFO(stat.st_mode))
return ESPIPE;
// Haiku does not use this information.
return 0;
}