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QNX SDP8.0C Library ReferenceAPIDeveloper
| Function | Classification | Library | Cancel | Signal | Thread |
|---|---|---|---|---|---|
| ualarm() | Standard Unix; removed from POSIX.1-2008 | libc | No | Yes | Yes |
| umask() | POSIX 1003.1 | libc | No | Yes | Yes |
| umount() | QNX OS | libc | Yes | No | Yes |
| UNALIGNED_PUT16() | QNX OS | libc | No | Yes | Yes |
| UNALIGNED_PUT32() | QNX OS | libc | No | Yes | Yes |
| UNALIGNED_PUT64() | QNX OS | libc | No | Yes | Yes |
| UNALIGNED_RET16() | QNX OS | libc | No | Yes | Yes |
| UNALIGNED_RET32() | QNX OS | libc | No | Yes | Yes |
| UNALIGNED_RET64() | QNX OS | libc | No | Yes | Yes |
| uname() | POSIX 1003.1 | libc | No | Yes | Yes |
| ungetc() | ANSI, POSIX 1003.1 | libc | Yes | No | Yes |
| ungetwc() | ANSI, POSIX 1003.1 | libc | Yes | No | Yes |
| _unregister_ioctl_handler() | QNX OS | libc | No | No | Yes |
| unlink() | POSIX 1003.1 | libc | Yes | Yes | Yes |
| unlinkat() | POSIX 2008 | libc | Yes | Yes | Yes |
| unlockpt() | POSIX 1003.1 | libc | No | Yes | Yes |
| unsetenv() | POSIX 1003.1 | libc | No | Yes | Yes |
| usleep() | Standard Unix; removed from POSIX.1-2008 | libc | Yes | Yes | Yes |
| utime() | POSIX 1003.1 | libc | No | Yes | Yes |
| utimensat() | POSIX 1003.1 | libc | No | Yes | Yes |
| utimes() | POSIX 1003.1 XSI | libc | No | Yes | Yes |
| utmpname() | Unix | libc | Yes | Yes | No |
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