D
| Function | Classification | Library | Cancel | ISR | Signal | Thread |
|---|---|---|---|---|---|---|
| daemon() | Legacy Unix | libc | No | No | Yes | See fork() for details |
| DebugBreak() | QNX Neutrino | libc | No | No | Yes | Yes |
| delay() | QNX Neutrino | libc | Yes | No | Yes | Yes |
| devctl() | QNX Neutrino | libc | Yes | No | Yes | Yes |
| devctlv() | QNX Neutrino | libc | Yes | No | Yes | Yes |
| dhcpctl*() | NetBSD | No | No | No | ||
| difftime() | ANSI, POSIX 1003.1 | libc | No | No | No | Yes |
| dircntl() | QNX Neutrino | libc | No | No | No | Yes |
| dirfd() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| dirname() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| dispatch_block() | QNX Neutrino | libc | Yes | No | Yes | Yes |
| dispatch_context_alloc() | QNX Neutrino | libc | No | No | No | Yes |
| dispatch_context_free() | QNX Neutrino | libc | No | No | No | Yes |
| dispatch_create() | QNX Neutrino | libc | No | No | No | Yes |
| dispatch_create_channel() | QNX Neutrino | libc | No | No | No | Yes |
| dispatch_destroy() | QNX Neutrino | libc | No | No | No | Yes |
| dispatch_handler() | QNX Neutrino | libc | Read the Caveats | No | No | Yes |
| dispatch_timeout() | QNX Neutrino | libc | No | No | No | Yes |
| dispatch_unblock() | QNX Neutrino | libc | Yes | No | Yes | Yes |
| div() | ANSI, POSIX 1003.1 | libc | No | Yes | Yes | Yes |
| dl_iterate_phdr() | QNX Neutrino | libc | No | No | No | Yes |
| dladdr() | Unix | libc | No | No | No | Yes |
| dlclose() | POSIX 1003.1 | libc | Yes | No | No | Yes |
| dlerror() | POSIX 1003.1 | libc | No | No | No | Yes |
| dlopen() | POSIX 1003.1 | libc | Yes | No | No | Yes |
| dlsym() | POSIX 1003.1 | libc | No | No | No | Yes |
| dn_comp() | Unix | libsocket | No | No | Yes | Yes |
| dn_expand() | Unix | libsocket | No | No | Yes | Yes |
| dprintf() | POSIX 2008 | libc | Yes | No | Yes | Yes |
| drand48() | POSIX 1003.1 XSI | libc | No | No | No | No |
| dup() | POSIX 1003.1 | libc | No | No | Yes | Yes |
| dup2() | POSIX 1003.1 | libc | No | No | Yes | Yes |
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