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Kernel: Add a systrace() syscall and implement /bin/strace using it.
Calling systrace(pid) gives you a file descriptor with a stream of the syscalls made by a peer process. The process must be owned by the same UID who calls systrace(). :^)
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12 changed files with 188 additions and 1 deletions
40
Userland/strace.cpp
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40
Userland/strace.cpp
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <AK/Assertions.h>
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#include <AK/Types.h>
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#include <Kernel/Syscall.h>
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int main(int argc, char** argv)
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{
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if (argc < 2)
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return 1;
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int pid = atoi(argv[1]);
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int fd = systrace(pid);
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if (fd < 0) {
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perror("systrace");
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return 1;
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}
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for (;;) {
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dword call[5];
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int nread = read(fd, &call, sizeof(call));
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if (nread == 0)
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break;
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if (nread < 0) {
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perror("read");
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return 1;
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}
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ASSERT(nread == sizeof(call));
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printf("%s(%#x, %#x, %#x) = %#x\n", Syscall::to_string((Syscall::Function)call[0]), call[1], call[2], call[3], call[4]);
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}
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int rc = close(fd);
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if (rc < 0) {
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perror("close");
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return 1;
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}
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return 0;
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}
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