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  47 .TH GRANTPT 3C "Aug 14, 2006"
  48 .SH NAME
  49 grantpt \- grant access to the slave pseudo-terminal device
  50 .SH SYNOPSIS
  51 .LP
  52 .nf
  53 #include <stdlib.h>
  54 
  55 \fBint\fR \fBgrantpt\fR(\fBint\fR \fIfildes\fR);
  56 .fi
  57 
  58 .SH DESCRIPTION
  59 .sp
  60 .LP
  61 The \fBgrantpt()\fR function changes the mode and ownership of the slave
  62 pseudo-terminal device associated with its master  pseudo-terminal counterpart.
  63 \fIfildes\fR is the file descriptor returned from a successful open of the
  64 master pseudo-terminal device. The user ID of the slave is set to the real UID
  65 of the calling process and the group ID is set to a reserved group. The
  66 permission mode of the slave pseudo-terminal is set to readable and writable by
  67 the owner and writable by the group.
  68 .SH RETURN VALUES
  69 .sp
  70 .LP
  71 Upon successful completion, \fBgrantpt()\fR returns \fB0\fR. Otherwise, it
  72 returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
  73 .SH ERRORS
  74 .sp
  75 .LP
  76 The \fBgrantpt()\fR function may fail if:
  77 .sp
  78 .ne 2
  79 .na
  80 \fB\fBEBADF\fR\fR
  81 .ad
  82 .RS 10n
  83 The \fIfildes\fR argument is not a valid open file descriptor.
  84 .RE
  85 
  86 .sp
  87 .ne 2
  88 .na
  89 \fB\fBEINVAL\fR\fR
  90 .ad
  91 .RS 10n
  92 The \fIfildes\fR argument is not associated with a master pseudo-terminal
  93 device.
  94 .RE
  95 
  96 .sp
  97 .ne 2
  98 .na
  99 \fB\fBEACCES\fR\fR
 100 .ad
 101 .RS 10n
 102 The corresponding slave pseudo-terminal device could not be accessed.
 103 .RE
 104 
 105 .SH ATTRIBUTES
 106 .sp
 107 .LP
 108 See \fBattributes\fR(5) for descriptions of the following attributes:
 109 .sp
 110 
 111 .sp
 112 .TS
 113 box;
 114 c | c
 115 l | l .
 116 ATTRIBUTE TYPE  ATTRIBUTE VALUE
 117 _
 118 Interface Stability     Standard
 119 _
 120 MT-Level        Safe
 121 .TE
 122 
 123 .SH SEE ALSO
 124 .sp
 125 .LP
 126 \fBopen\fR(2), \fBptsname\fR(3C), \fBunlockpt\fR(3C), \fBattributes\fR(5),
 127 \fBstandards\fR(5)
 128 .sp
 129 .LP
 130 \fISTREAMS Programming Guide\fR