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.Dd January 14, 2018
.Dt sysdecode_enum 3
.Os
.Sh NAME
.Nm sysdecode_enum ,
.Nm sysdecode_acltype ,
.Nm sysdecode_atfd ,
.Nm sysdecode_extattrnamespace ,
.Nm sysdecode_fadvice ,
.Nm sysdecode_fcntl_cmd ,
.Nm sysdecode_getfsstat_mode ,
.Nm sysdecode_getrusage_who ,
.Nm sysdecode_idtype ,
.Nm sysdecode_ipproto ,
.Nm sysdecode_kldsym_cmd ,
.Nm sysdecode_kldunload_flags ,
.Nm sysdecode_lio_listio_mode ,
.Nm sysdecode_madvice ,
.Nm sysdecode_minherit_flags ,
.Nm sysdecode_msgctl_cmd ,
.Nm sysdecode_nfssvc_flags ,
.Nm sysdecode_pathconf_name ,
.Nm sysdecode_prio_which ,
.Nm sysdecode_procctl_cmd ,
.Nm sysdecode_ptrace_request ,
.Nm sysdecode_rlimit ,
.Nm sysdecode_rtprio_function ,
.Nm sysdecode_scheduler_policy ,
.Nm sysdecode_sctp_pr_policy ,
.Nm sysdecode_sctp_sinfo_flags ,
.Nm sysdecode_semctl_cmd ,
.Nm sysdecode_shmctl_cmd ,
.Nm sysdecode_shutdown_how ,
.Nm sysdecode_sigbus_code ,
.Nm sysdecode_sigchld_code ,
.Nm sysdecode_sigfpe_code ,
.Nm sysdecode_sigill_code ,
.Nm sysdecode_signal ,
.Nm sysdecode_sigprocmask_how ,
.Nm sysdecode_sigsegv_code ,
.Nm sysdecode_sigtrap_code ,
.Nm sysdecode_sockaddr_family ,
.Nm sysdecode_socketdomain ,
.Nm sysdecode_sockettype ,
.Nm sysdecode_sockopt_level ,
.Nm sysdecode_sysarch_number ,
.Nm sysdecode_umtx_op ,
.Nm sysdecode_vmresult ,
.Nm sysdecode_whence
.Nd lookup name of various enumerated values
.Sh LIBRARY
.Lb libsysdecode
.Sh SYNOPSIS
.In sys/types.h
.In stdbool.h
.In sysdecode.h
.Ft const char *
.Fn sysdecode_acltype "int type"
.Ft const char *
.Fn sysdecode_atfd "int fd"
.Ft const char *
.Fn sysdecode_extattrnamespace "int namespace"
.Ft const char *
.Fn sysdecode_fadvice "int advice"
.Ft const char *
.Fn sysdecode_fcntl_cmd "int cmd"
.Ft const char *
.Fn sysdecode_getfsstat_mode "int mode"
.Ft const char *
.Fn sysdecode_getrusage_who "int who"
.Ft const char *
.Fn sysdecode_idtype "int idtype"
.Ft const char *
.Fn sysdecode_ipproto "int protocol"
.Ft const char *
.Fn sysdecode_kldsym_cmd "int cmd"
.Ft const char *
.Fn sysdecode_kldunload_flags "int flags"
.Ft const char *
.Fn sysdecode_lio_listio_mode "int mode"
.Ft const char *
.Fn sysdecode_madvice "int advice"
.Ft const char *
.Fn sysdecode_minherit_flags "int inherit"
.Ft const char *
.Fn sysdecode_msgctl_cmd "int cmd"
.Ft const char *
.Fn sysdecode_nfssvc_flags "int flags"
.Ft const char *
.Fn sysdecode_pathconf_name "int name"
.Ft const char *
.Fn sysdecode_prio_which "int which"
.Ft const char *
.Fn sysdecode_procctl_cmd "int cmd"
.Ft const char *
.Fn sysdecode_ptrace_request "int request"
.Ft const char *
.Fn sysdecode_rlimit "int resource"
.Ft const char *
.Fn sysdecode_rtprio_function "int function"
.Ft const char *
.Fn sysdecode_scheduler_policy "int policy"
.Ft const char *
.Fn sysdecode_sctp_pr_policy "int policy"
.Ft const char *
.Fn sysdecode_semctl_cmd "int cmd"
.Ft const char *
.Fn sysdecode_shmctl_cmd "int cmd"
.Ft const char *
.Fn sysdecode_shutdown_how "int how"
.Ft const char *
.Fn sysdecode_sigbus_code "int si_code"
.Ft const char *
.Fn sysdecode_sigchld_code "int si_code"
.Ft const char *
.Fn sysdecode_sigfpe_code "int si_code"
.Ft const char *
.Fn sysdecode_sigill_code "int si_code"
.Ft const char *
.Fn sysdecode_signal "int sig"
.Ft const char *
.Fn sysdecode_sigprocmask_how "int how"
.Ft const char *
.Fn sysdecode_sigsegv_code "int si_code"
.Ft const char *
.Fn sysdecode_sigtrap_code "int si_code"
.Ft const char *
.Fn sysdecode_sockaddr_family "int sa_family"
.Ft const char *
.Fn sysdecode_socketdomain "int domain"
.Ft const char *
.Fn sysdecode_sockettype "int type"
.Ft const char *
.Fn sysdecode_sockopt_level "int level"
.Ft const char *
.Fn sysdecode_sysarch_number "int number"
.Ft const char *
.Fn sysdecode_umtx_op "int op"
.Ft const char *
.Fn sysdecode_vmresult "int result"
.Ft const char *
.Fn sysdecode_whence "int whence"
.Sh DESCRIPTION
The
.Nm
functions return a text description of an integer value.
The text description matches the name of a C macro with the same value as the
sole function argument.
.Dv NULL
is returned if there is no matching C macro name.
.Pp
Most of these functions decode an argument passed to a system call:
.Bl -column "Fn sysdecode_extattrnamespace" "Xr sched_setscheduler 2"
.It Sy Function Ta Sy System Call Ta Sy Argument
.It Fn sysdecode_acltype Ta Xr acl_get_file 3 Ta Fa type
.It Fn sysdecode_atfd Ta Xr openat 2 Ta Fa fd
.It Fn sysdecode_extattrnamespace Ta Xr extattr_get_fd 2 Ta Fa attrnamespace
.It Fn sysdecode_fadvice Ta Xr posix_fadvise 2 Ta Fa advice
.It Fn sysdecode_fcntl_cmd Ta Xr fcntl 2 Ta Fa cmd
.It Fn sysdecode_getfsstat_mode Ta Xr getfsstat 2 Ta Fa mode
.It Fn sysdecode_idtype Ta
.Xr procctl 2 ,
.Xr waitid 2
.Ta Fa idtype
.It Fn sysdecode_kldsym_cmd Ta Xr kldsym 2 Ta Fa cmd
.It Fn sysdecode_kldunload_flags Ta Xr kldunloadf 2 Ta Fa flags
.It Fn sysdecode_lio_listio_mode Ta Xr lio_listio 2 Ta Fa mode
.It Fn sysdecode_madvice Ta Xr madvise 2 Ta Fa advice
.It Fn sysdecode_minherit_inherit Ta Xr minherit 2 Ta Fa inherit
.It Fn sysdecode_msgctl_cmd Ta Xr msgctl 2 Ta Fa cmd
.It Fn sysdecode_nfssvc_flags Ta Xr nfssvc 2 Ta Fa flags
.It Fn sysdecode_pathconf_name Ta Xr pathconf 2 Ta Fa name
.It Fn sysdecode_prio_which Ta Xr getpriority 2 Ta Fa which
.It Fn sysdecode_procctl_cmd Ta Xr procctl 2 Ta Fa cmd
.It Fn sysdecode_ptrace_request Ta Xr ptrace 2 Ta Fa request
.It Fn sysdecode_rlimit Ta Xr getrlimit 2 Ta Fa resource
.It Fn sysdecode_rtprio_function Ta Xr rtprio 2 Ta Fa function
.It Fn sysdecode_getrusage_who Ta Xr getrusage 2 Ta Fa who
.It Fn sysdecode_scheduler_policy Ta Xr sched_setscheduler 2 Ta Fa policy
.It Fn sysdecode_semctl_cmd Ta Xr semctl 2 Ta Fa cmd
.It Fn sysdecode_shmctl_cmd Ta Xr shmctl 2 Ta Fa cmd
.It Fn sysdecode_shutdown_how Ta Xr shutdown 2 Ta Fa how
.It Fn sysdecode_sigprocmask_how Ta Xr sigprocmask 2 Ta Fa how
.It Fn sysdecode_sockopt_level Ta Xr getsockopt 2 Ta Fa level
.It Fn sysdecode_sysarch_number Ta Xr sysarch 2 Ta Fa number
.It Fn sysdecode_umtx_op Ta Xr _umtx_op 2 Ta Fa op
.It Fn sysdecode_whence Ta Xr lseek 2 Ta Fa whence
.El
.Pp
These functions decode signal-specific signal codes stored in the
.Fa si_code
field of the
.Vt siginfo_t
object associated with an instance of signal:
.Bl -column "Fn sysdecode_sigchld_code"
.It Sy Function Ta Sy Signal
.It Fn sysdecode_sigbus_code Ta Dv SIGBUS
.It Fn sysdecode_sigchld_code Ta Dv SIGCHLD
.It Fn sysdecode_sigfpe_code Ta Dv SIGFPE
.It Fn sysdecode_sigill_code Ta Dv SIGILL
.It Fn sysdecode_sigsegv_code Ta Dv SIGSEGV
.It Fn sysdecode_sigtrap_code Ta Dv SIGBTRAP
.El
.Pp
Other functions decode the values described below:
.Bl -tag -width "Fn sysdecode_sockaddr_family"
.It Fn sysdecode_ipproto
An IP protocol.
.It Fn sysdecode_sctp_pr_policy
A PR-SCTP policy.
.It Fn sysdecode_signal
A process signal.
.It Fn sysdecode_sockaddr_family
A socket address family.
.It Fn sysdecode_socketdomain
A socket domain.
.It Fn sysdecode_vmresult
The return value of a function in the virtual memory subsystem of the kernel
indicating the status of the associated request.
.El
.Sh RETURN VALUES
The
.Nm
functions return the name of a matching C macro or
.Dv NULL
if no matching C macro was found.
.Sh SEE ALSO
.Xr sysdecode 3 ,
.Xr sysdecode_mask 3 ,
.Xr sysdecode_sigcode 3