55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/* insmod.c - Load a module into the Linux kernel.
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*
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* Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
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USE_INSMOD(NEWTOY(insmod, "<1", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
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config INSMOD
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bool "insmod"
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default y
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help
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usage: insmod MODULE [MODULE_OPTIONS]
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Load the module named MODULE passing options if given.
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*/
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#include "toys.h"
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#include <sys/syscall.h>
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#ifdef SYS_finit_module
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#define finit_module(fd, opts, flags) syscall(SYS_finit_module, fd, opts, flags)
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#else
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#define finit_module(a, b, c) (errno = ENOSYS)
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#endif
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#define init_module(mod, len, opts) syscall(SYS_init_module, mod, len, opts)
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void insmod_main(void)
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{
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int fd = xopenro(*toys.optargs);
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int i, rc;
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i = 1;
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while (toys.optargs[i] &&
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strlen(toybuf) + strlen(toys.optargs[i]) + 2 < sizeof(toybuf))
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{
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strcat(toybuf, toys.optargs[i++]);
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strcat(toybuf, " ");
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}
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// finit_module was new in Linux 3.8, and doesn't work on stdin,
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// so we fall back to init_module if necessary.
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rc = finit_module(fd, toybuf, 0);
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if (rc && (fd == 0 || errno == ENOSYS)) {
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off_t len = 0;
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char *path = !strcmp(*toys.optargs, "-") ? "/dev/stdin" : *toys.optargs;
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char *buf = readfileat(AT_FDCWD, path, NULL, &len);
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rc = init_module(buf, len, toybuf);
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if (CFG_TOYBOX_FREE) free(buf);
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}
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if (rc) perror_exit("failed to load %s", toys.optargs[0]);
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if (CFG_TOYBOX_FREE) close(fd);
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}
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