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77 lines
2.6 KiB
Plaintext
77 lines
2.6 KiB
Plaintext
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$Id: deviations,v 1.1 1997/02/28 05:42:26 gdr Exp $
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These are deviations from POSIX 1003.1:
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======================================
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Feature: full implementation
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Header: (various)
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Not all functions and system calls specified by POSIX 1003.1 are
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implemented.
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Feature: non-compliant limits/constants
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Header: (various)
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Value POSIX GNO Header File
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-------------------------------------------------------------------
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STDIN_FILENO 0 1 unistd.h
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STDOUT_FILENO 1 2 unistd.h
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STDERR_FILENO 2 3 unistd.h
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_POSIX_LINK_MAX 8 1 limits.h
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Feature: alarm(2)
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Header: unistd.h
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POSIX specifies that both the single argument and return type
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should be unsigned int. GNO uses unsigned long for both.
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Feature: fork(2)
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Header: unistd.h
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POSIX specifies an empty argument list, and both child and parent
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process resume execution at the point where fork() returns but in
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different address spaces. The GNO implementation takes a pointer
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to a function at which the child process begins execution, and child
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and parent share the address space.
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Feature: getpgrp(2)
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Header: unistd.h
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POSIX specifies a pid_t return type. GNO implementation returns
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an int.
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These are deviations from the BSD implementations:
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=================================================
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Feature: POSIX compliance
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Header: sys/unistd.h
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BSD is POSIX2 compliant, GNO is not. (_POSIX2_VERSION is undefined)
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Feature: vfork(2)
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Header: unistd.h
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See the notes on fork(2) in the section on POSIX deviations.
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Feature: machine types
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Header: <sys/types.h>, <sys/ansi.h>
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BSD uses "long long" and "unsigned long long" for quad_t and u_quad_t,
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respectively. GNO uses structures.
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Type BSD GNO Header File
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-------------------------------------------------------------------------------
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quad_t long long (structure) sys/types.h
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u_quad_t unsigned long long (structure) sys/types.h
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pid_t long short sys/types.h
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off_t quad_t long sys/types.h
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dev_t unsigned long unsigned short sys/types.h
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uid_t unsigned long unsigned short sys/types.h
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gid_t unsigned long unsigned short sys/types.h
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_BSD_PTRDIFF_T_ int long machine/ansi.h
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_BSD_SIZE_T_ unsigned int unsigned long machine/ansi.h
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_BSD_SSIZE_T_ int long machine/ansi.h
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_BSD_OFF_T_ long long long machine/ansi.h
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_BSD_PID_T_ long short machine/ansi.h
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_BSD_WCHAR_T_ int long machine/ansi.h
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_BSD_RUNE_T_ int long machine/ansi.h
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Value BSD GNO Header File
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-------------------------------------------------------------------------------
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_BSD_CLK_TCK_ 128 60 machine/ansi.h
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_BSD_CLOCKS_PER_SEC_ 128 60 machine/ansi.h
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LINK_MAX 32767 1 sys/syslimits.h
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