6894ced63b
This patch implements 'execve' in Genode's libc. The mechanism relies on the dynamic linker's ability to replace the loaded binary while keeping crucial libraries - in particular the libc - intact. The state outside the libc is wiped. For this reason, all libc internal state needed beyond the 'execve' call must be allocated on a heap separate from the application-owned malloc heap. E.g., libc-internal file-descriptor objects must not be allocated or refer to any memory object allocated from the malloc heap. Issue #3481
38 lines
589 B
C++
38 lines
589 B
C++
/*
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* \brief Simple execve test
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* \author Norman Feske
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* \date 2019-08-20
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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int main(int argc, char **argv)
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{
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if (argc <= 1)
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return -1;
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int const count = atoi(argv[1]);
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printf("count %d\n", count);
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if (count <= 0)
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return 0;
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{
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char argv0[20];
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char argv1[20];
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snprintf(argv0, sizeof(argv0), "test-execve");
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snprintf(argv1, sizeof(argv1), "%d", count - 1);
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char *argv[] { argv0, argv1, NULL };
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execve("test-execve", argv, NULL);
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}
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printf("This code should never be reached.\n");
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return -1;
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}
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