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lib/memfd: shm_unlink or unlink anonymous file 

https://man7.org/linux/man-pages/man2/memfd_create.2.html:
       The name supplied in name is used as a filename and will be
       displayed as the target of the corresponding symbolic link in the
       directory /proc/self/fd/.  The displayed name is always prefixed
       with memfd: and serves only for debugging purposes.  Names do not
       affect the behavior of the file descriptor, and as such multiple
       files can have the same name without any side effects.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao 2023-10-05 19:57:30 +08:00 committed by Alan Carvalho de Assis
parent 1b843633e6
commit aa0b3fcdf9
1 changed files with 13 additions and 2 deletions
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15
libs/libc/misc/lib_memfd.c
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@ -52,13 +52,24 @@ int memfd_create(FAR const char *name, unsigned int flags)
return -1;
#else
char path[PATH_MAX];
int ret;
snprintf(path, sizeof(path), LIBC_MEM_FD_VFS_PATH_FMT, name);
# ifdef CONFIG_LIBC_MEMFD_SHMFS
return shm_open(path, O_RDWR | flags, 0660);
ret = shm_open(path, O_RDWR | flags, 0660);
if (ret >= 0)
{
shm_unlink(path);
}
# else
mkdir(LIBC_MEM_FD_VFS_PATH, 0666);
return open(path, O_RDWR | flags, 0660);
ret = open(path, O_RDWR | flags, 0660);
if (ret >= 0)
{
unlink(path);
}
# endif
return ret;
#endif
}