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LibC: Add truncate().

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Implemented in user space for now.
This commit is contained in:
Nico Weber 2020-06-15 11:28:42 -04:00 • committed by Andreas Kling
parent 246e0e47ec
commit 9825f7792b
2 changed files with 14 additions and 0 deletions
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13
Libraries/LibC/unistd.cpp
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@ -553,6 +553,19 @@ int ftruncate(int fd, off_t length)
__RETURN_WITH_ERRNO(rc, rc, -1); __RETURN_WITH_ERRNO(rc, rc, -1);
} }
int truncate(const char* path, off_t length)
{
int fd = open(path, O_RDWR | O_CREAT, 0666);
if (fd < 0)
return fd;
int rc = ftruncate(fd, length);
int saved_errno = errno;
if (int close_rc = close(fd); close_rc < 0)
return close_rc;
errno = saved_errno;
return rc;
}
int gettid() int gettid()
{ {
if (!s_cached_tid) if (!s_cached_tid)

1
Libraries/LibC/unistd.h
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@ -127,6 +127,7 @@ char* getlogin();
int chown(const char* pathname, uid_t, gid_t); int chown(const char* pathname, uid_t, gid_t);
int fchown(int fd, uid_t, gid_t); int fchown(int fd, uid_t, gid_t);
int ftruncate(int fd, off_t length); int ftruncate(int fd, off_t length);
int truncate(const char* path, off_t length);
int halt(); int halt();
int reboot(); int reboot();
int mount(int source_fd, const char* target, const char* fs_type, int flags); int mount(int source_fd, const char* target, const char* fs_type, int flags);