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Kernel+LibC: Implement readlinkat(2)

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Co-Authored-By: Daniel Bertalan <dani@danielbertalan.dev>
This commit is contained in:
sin-ack 2022-10-01 11:20:08 +00:00 • committed by Andrew Kaster
parent 9850a69cd1
commit 6445a706cf
6 changed files with 16 additions and 6 deletions
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3
Userland/Libraries/LibC/serenity.cpp
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@ -105,7 +105,8 @@ int serenity_readlink(char const* path, size_t path_length, char* buffer, size_t
{
Syscall::SC_readlink_params small_params {
{ path, path_length },
{ buffer, buffer_size }
{ buffer, buffer_size },
AT_FDCWD
};
int rc = syscall(SC_readlink, &small_params);
__RETURN_WITH_ERRNO(rc, rc, -1);

10
Userland/Libraries/LibC/unistd.cpp
View file

@ -630,10 +630,16 @@ int sethostname(char const* hostname, ssize_t size)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlink.html
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html
ssize_t readlink(char const* path, char* buffer, size_t size)
{
Syscall::SC_readlink_params params { { path, strlen(path) }, { buffer, size } };
return readlinkat(AT_FDCWD, path, buffer, size);
}
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/readlinkat.html
ssize_t readlinkat(int dirfd, char const* path, char* buffer, size_t size)
{
Syscall::SC_readlink_params params { { path, strlen(path) }, { buffer, size }, dirfd };
int rc = syscall(SC_readlink, &params);
// Return the number of bytes placed in the buffer, not the full path size.
__RETURN_WITH_ERRNO(rc, min((size_t)rc, size), -1);

1
Userland/Libraries/LibC/unistd.h
View file

@ -88,6 +88,7 @@ int usleep(useconds_t);
int gethostname(char*, size_t);
int sethostname(char const*, ssize_t);
ssize_t readlink(char const* path, char* buffer, size_t);
ssize_t readlinkat(int dirfd, char const* path, char* buffer, size_t);
char* ttyname(int fd);
int ttyname_r(int fd, char* buffer, size_t);
off_t lseek(int fd, off_t, int whence);