59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
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#include <alloca.h>
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#include <malloc.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <libgen.h>
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#if !defined(QEMU_ARM_BIN)
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#define QEMU_ARM_BIN "qemu-arm"
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#endif
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const char * qemu_arm_bin = QEMU_ARM_BIN;
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// This program takes arguments according to the behavior of binfmt_misc with
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// the preserve-argv[0] flag set.
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//
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// The first value in argv is the name of this executable, uninteresting.
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// The second value is the full path of the executable to run with the
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// alternate interpreter.
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// The third value is the name that executable was called with.
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//
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// This program passes the third value in to qemu-arm after the -0 flag.
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int main(int argc, char const* argv[]) {
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// Abort if we don't have sufficient arguments
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if(argc < 3){
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fprintf( stderr, "qemu-arm wrapper called with too few arguments.\nEnsure that the 'P' flag is set in binfmt_misc.\n");
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return -1;
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}
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char *qemu;
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asprintf(&qemu, "%s/%s", dirname(argv[0]), qemu_arm_bin);
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// Allocate the new argc array to pass to qemu-arm
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const int new_argc = argc + 1;
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char** const new_argv = alloca((new_argc + 1) * sizeof(void *));
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// Fill this new array
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new_argv[0] = qemu;
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new_argv[1] = strdup("-0");
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new_argv[2] = strdup(argv[2]);
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new_argv[3] = strdup(argv[1]);
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for(int i = 4; i < new_argc; ++i){
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new_argv[i] = strdup(argv[i-1]);
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}
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new_argv[new_argc] = NULL;
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// Run qemu with the new arguments
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execvp(new_argv[0], new_argv);
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const int ret = errno;
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// Clean up, haha C
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for(int i = 0; i < new_argc; ++i){
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free(new_argv[i]);
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}
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return ret;
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};
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