1unlockpt(3C)             Standard C Library Functions             unlockpt(3C)
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NAME

6       unlockpt - unlock a pseudo-terminal master/slave pair
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SYNOPSIS

9       #include <stdlib.h>
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11       int unlockpt(int fildes);
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DESCRIPTION

15       The  unlockpt() function unlocks the slave pseudo-terminal device asso‐
16       ciated with the master to which fildes refers.
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19       Portable applications must call unlockpt()  before  opening  the  slave
20       side of a pseudo-terminal device.
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RETURN VALUES

23       Upon successful completion, unlockpt() returns 0. Otherwise, it returns
24       −1 and sets errno to indicate the error.
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ERRORS

27       The unlockpt() function may fail if:
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29       EBADF     The fildes argument is not a file descriptor open  for  writ‐
30                 ing.
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33       EINVAL    The  fildes  argument is not associated with a master pseudo-
34                 terminal device.
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ATTRIBUTES

38       See attributes(5) for descriptions of the following attributes:
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43       ┌─────────────────────────────┬─────────────────────────────┐
44       │      ATTRIBUTE TYPE         │      ATTRIBUTE VALUE        │
45       ├─────────────────────────────┼─────────────────────────────┤
46       │Interface Stability          │Standard                     │
47       ├─────────────────────────────┼─────────────────────────────┤
48       │MT-Level                     │Safe                         │
49       └─────────────────────────────┴─────────────────────────────┘
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SEE ALSO

52       open(2), grantpt(3C), ptsname(3C), attributes(5), standards(5)
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55       STREAMS Programming Guide
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59SunOS 5.11                        14 Aug 2002                     unlockpt(3C)
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