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Ensure /dev/mach gets the same fd on fork
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src/kernel/mach_server/client/lkm.c
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src/kernel/mach_server/client/lkm.c
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void mach_driver_init(void)
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{
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int new_driver_fd;
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if (driver_fd != -1)
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close(driver_fd);
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driver_fd = open("/dev/mach", O_RDWR | O_CLOEXEC);
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if (driver_fd == -1)
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new_driver_fd = open("/dev/mach", O_RDWR | O_CLOEXEC);
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if (new_driver_fd == -1)
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{
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const char* msg = "Cannot open /dev/mach. Aborting.\nMake sure you have loaded the darling-mach kernel module.\n";
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write(2, msg, strlen(msg));
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abort();
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}
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// Ensure we get the same fd number, even if lower ones are available
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if (driver_fd != -1 && driver_fd != new_driver_fd)
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{
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dup2(new_driver_fd, driver_fd);
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close(new_driver_fd);
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}
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else
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driver_fd = new_driver_fd;
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if (__real_ioctl(driver_fd, NR_get_api_version, 0) != DARLING_MACH_API_VERSION)
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{