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mlibc: emulate sbrk

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Matheus
2023-08-07 02:12:18 -03:00
parent 5ea1479601
commit 2bd2b998af
1 changed files with 41 additions and 2 deletions
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patches/mlibc/jinx-working-patch.patch
+41 -2
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@@ -135,10 +135,10 @@ index 0000000..e5b087a
+ +
diff --git mlibc-workdir/sysdeps/astral/generic/generic.cpp mlibc-workdir/sysdeps/astral/generic/generic.cpp diff --git mlibc-workdir/sysdeps/astral/generic/generic.cpp mlibc-workdir/sysdeps/astral/generic/generic.cpp
new file mode 100644 new file mode 100644
index 0000000..23128c0 index 0000000..26d9be2
--- /dev/null --- /dev/null
+++ mlibc-workdir/sysdeps/astral/generic/generic.cpp +++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
@@ -0,0 +1,448 @@ @@ -0,0 +1,487 @@
+#include <bits/ensure.h> +#include <bits/ensure.h>
+#include <mlibc/debug.hpp> +#include <mlibc/debug.hpp>
+#include <mlibc/all-sysdeps.hpp> +#include <mlibc/all-sysdeps.hpp>
@@ -151,6 +151,45 @@ index 0000000..23128c0
+#include <poll.h> +#include <poll.h>
+#include <sys/select.h> +#include <sys/select.h>
+ +
+#ifndef MLIBC_BUILDING_RTDL
+// (s)brk is emulated in the libc rather than being
+// an actual system call.
+#define SBRK_BUFFER_SIZE (1024 * 1024 * 16)
+static void *sbrkbuffer;
+static off_t sbrkoffset;
+
+extern "C" void *sbrk(intptr_t increment) {
+ // allocate the buffer if its the first time sbrk is called
+ if (sbrkbuffer == NULL) {
+ int e = mlibc::sys_vm_map(NULL, SBRK_BUFFER_SIZE, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0, &sbrkbuffer);
+ if (e) {
+ errno = e;
+ return NULL;
+ }
+ }
+
+ if (increment == 0)
+ return sbrkbuffer;
+
+ off_t newoffset = sbrkoffset + increment;
+ if (newoffset < 0) {
+ // offset goes below what we allocated, this is bad
+ errno = EINVAL;
+ return NULL;
+ }
+
+ if (newoffset >= SBRK_BUFFER_SIZE) {
+ // new offset goes past what was allocated
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ void *ret = (void *)((uintptr_t)sbrkbuffer + increment);
+ sbrkoffset = newoffset;
+ return ret;
+}
+#endif
+
+namespace mlibc { +namespace mlibc {
+ +
+ int sys_setuid(uid_t id) { + int sys_setuid(uid_t id) {