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libc: Implement access function correctly

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Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I6ae3abf79bd9aa8cfb54b8bbe302d69c4d9cb8ff
This commit is contained in:
Xiang Xiao 2020-09-10 12:10:52 +08:00 committed by Alin Jerpelea
parent a1c047fe53
commit f4794f0b48
1 changed files with 27 additions and 3 deletions
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30
libs/libc/unistd/lib_access.c
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@ -39,6 +39,7 @@
#include <nuttx/config.h>
#include <sys/stat.h>
#include <unistd.h>
/****************************************************************************
@ -71,8 +72,8 @@
* Description:
* The access() function shall check the file named by the pathname pointed
* to by the path argument for accessibility according to the bit pattern
* contained in amode, using the real user ID in place of the effective user
* ID and the real group ID in place of the effective group ID.
* contained in amode, using the real user ID in place of the effective
* user ID and the real group ID in place of the effective group ID.
* As there are no users in NuttX, the function always succeeds.
*
* Input Parameters:
@ -80,7 +81,8 @@
* amode - the access mode
*
* Returned Value:
* Always OK (zero)
* Return OK (zero) if the caller can access the file with the required
* permission, otherwise return -1.
*
* Assumptions:
*
@ -88,5 +90,27 @@
int access(FAR const char *path, int amode)
{
struct stat s;
if (stat(path, &s))
{
return -1;
}
if (s.st_mode & S_IFDIR)
{
return 0;
}
if (amode & W_OK)
{
if (s.st_mode & S_IWUSR)
{
return 0;
}
return -1;
}
return 0;
}