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Add APE fexecve() support (#733)

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Gavin Hayes 2023-02-22 21:58:23 -05:00 • committed by GitHub
parent b275e664ec
commit ff9c15f48a
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9 changed files with 191 additions and 29 deletions
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12
libc/calls/execve-sysv.c
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@ -19,6 +19,7 @@
#include "libc/calls/blockcancel.internal.h"
#include "libc/calls/blocksigs.internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/execve-sysv.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
@ -37,6 +38,11 @@ static bool CanExecute(const char *path) {
return !sys_faccessat(AT_FDCWD, path, X_OK, 0);
}
bool IsAPEMagic(char buf[8]) {
return READ64LE(buf) == READ64LE("MZqFpD='") ||
READ64LE(buf) == READ64LE("JTqFpD='");
}
static bool IsApeBinary(const char *path) {
int fd;
char buf[8];
@ -44,11 +50,7 @@ static bool IsApeBinary(const char *path) {
// TODO(jart): Should we block signals too?
BLOCK_CANCELLATIONS;
if ((fd = sys_open(path, O_RDONLY, 0)) != -1) {
if (sys_read(fd, buf, 8) == 8 && //
(READ64LE(buf) == READ64LE("MZqFpD='") ||
READ64LE(buf) == READ64LE("JTqFpD='"))) {
res = true;
}
res = sys_read(fd, buf, 8) == 8 && IsAPEMagic(buf);
sys_close(fd);
}
ALLOW_CANCELLATIONS;