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grantpt(3p) — Linux manual page

GRANTPT(3P)             POSIX Programmer's ManualGRANTPT(3P)

PROLOG        top

       This manual page is part of the POSIX Programmer's Manual.  The       Linux implementation of this interface may differ (consult the       corresponding Linux manual page for details of Linux behavior), or       the interface may not be implemented on Linux.

NAME        top

       grantpt — grant access to the slave pseudo-terminal device

SYNOPSIS        top

       #include <stdlib.h>       int grantpt(intfildes);

DESCRIPTION        top

       Thegrantpt() function shall change the mode and ownership of the       slave pseudo-terminal device associated with its master pseudo-       terminal counterpart. Thefildes argument is a file descriptor       that refers to a master pseudo-terminal device. The user ID of the       slave shall be set to the real UID of the calling process and the       group ID shall be set to an unspecified group ID. The permission       mode of the slave pseudo-terminal shall be set to readable and       writable by the owner, and writable by the group.       The behavior of thegrantpt() function is unspecified if the       application has installed a signal handler to catch SIGCHLD       signals.

RETURN VALUE        top

       Upon successful completion,grantpt() shall return 0; otherwise,       it shall return -1 and seterrno to indicate the error.

ERRORS        top

       Thegrantpt() function may fail if:EACCESThe corresponding slave pseudo-terminal device could not be              accessed.EBADFThefildes argument is not a valid open file descriptor.EINVALThefildes argument is not associated with a master pseudo-              terminal device.The following sections are informative.

EXAMPLES        top

       None.

APPLICATION USAGE        top

       None.

RATIONALE        top

       See the RATIONALE section forposix_openpt(3p).

FUTURE DIRECTIONS        top

       None.

SEE ALSO        top

open(3p),posix_openpt(3p),ptsname(3p),unlockpt(3p)       The Base Definitions volume of POSIX.1‐2017,stdlib.h(0p)

COPYRIGHT        top

       Portions of this text are reprinted and reproduced in electronic       form from IEEE Std 1003.1-2017, Standard for Information       Technology -- Portable Operating System Interface (POSIX), The       Open Group Base Specifications Issue 7, 2018 Edition, Copyright       (C) 2018 by the Institute of Electrical and Electronics Engineers,       Inc and The Open Group.  In the event of any discrepancy between       this version and the original IEEE and The Open Group Standard,       the original IEEE and The Open Group Standard is the referee       document. The original Standard can be obtained online athttp://www.opengroup.org/unix/online.html .       Any typographical or formatting errors that appear in this page       are most likely to have been introduced during the conversion of       the source files to man page format. To report such errors, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017GRANTPT(3P)

Pages that refer to this page:stdlib.h(0p), posix_openpt(3p), ptsname(3p), unlockpt(3p)

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