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* Very simple test application for mailslots
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* (C) 2005 Jelmer Vernooij <jelmer@samba.org>
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* Published to the public domain
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int read_slot(const char *mailslotname)
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DWORD nextsize, nummsg = 0;
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if (strncmp(mailslotname, "\\\\.\\mailslot\\", 13) && strncmp(mailslotname, "\\\\*\\mailslot\\", 13)) {
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printf("Must specify local mailslot name (starting with \\\\.\\mailslot\\)\n");
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h = CreateMailslot(mailslotname, 0, MAILSLOT_WAIT_FOREVER, NULL);
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if (h == INVALID_HANDLE_VALUE) {
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printf("Unable to create mailslot %s: %d\n", mailslotname, GetLastError());
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if (!ReadFile(h, data, sizeof(data)-1, &nr, NULL)) {
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printf("Error reading: %d\n", GetLastError());
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int write_slot(const char *mailslotname)
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h = CreateFile(mailslotname, GENERIC_WRITE, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (h == INVALID_HANDLE_VALUE) {
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printf("Unable to open file: %d\n", GetLastError());
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if (!WriteFile(h, data, strlen(data), &nw, NULL)) {
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printf("Error writing file: %d\n", GetLastError());
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int main(int argc, char **argv)
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(strcmp(argv[1], "read") && strcmp(argv[1], "write"))) {
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printf("Usage: %s read|write mailslot\n", argv[0]);
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if (!strcmp(argv[1], "read")) {
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return read_slot(argv[2]);
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if (!strcmp(argv[1], "write")) {
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return write_slot(argv[2]);