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Work towards zipos / open(argv[0]) on metal (#667)

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tkchia 2022-11-06 15:29:47 +08:00 • committed by GitHub
parent 543c93f623
commit cb9a0466f1
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17 changed files with 257 additions and 46 deletions
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32
libc/calls/openat-metal.c
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@ -16,24 +16,46 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "ape/relocations.h"
#include "ape/sections.internal.h"
#include "libc/assert.h"
#include "libc/calls/internal.h"
#include "libc/calls/metalfile.internal.h"
#include "libc/intrin/directmap.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/macros.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/pc.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/errfuns.h"
#include "libc/zipos/zipos.internal.h"
int sys_openat_metal(int dirfd, const char *file, int flags, unsigned mode) {
int fd;
struct MetalFile *state;
if (strcmp(file, "ape.com")) return enoent();
if (!_weaken(calloc)) return enomem();
if (dirfd != AT_FDCWD || strcmp(file, APE_COM_NAME)) return enoent();
if (flags != O_RDONLY) return eacces();
if (!_weaken(__ape_com_base) || !_weaken(__ape_com_size))
return eopnotsupp();
if ((fd = __reservefd(-1)) == -1) return -1;
state = _weaken(calloc)(1, sizeof(struct MetalFile));
state->base = (char *)_base;
state->size = _end - _base;
if (!_weaken(calloc) || !_weaken(free)) {
struct DirectMap dm;
dm = sys_mmap_metal(NULL, ROUNDUP(sizeof(struct MetalFile), 4096),
PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS,
-1, 0);
state = dm.addr;
if (state == (void *)-1) return -1;
} else {
state = _weaken(calloc)(1, sizeof(struct MetalFile));
if (!state) return -1;
}
state->base = (char *)__ape_com_base;
state->size = __ape_com_size;
g_fds.p[fd].kind = kFdFile;
g_fds.p[fd].flags = flags;
g_fds.p[fd].mode = mode;