freebsd-dev/lib/libc/gen/psignal.3
Ed Schouten 0977bd1e88 Fix the signature of the psignal() function.
POSIX 2008 added the psignal() function which has already been part of
the BSDs for a long time. The only difference is, the POSIX version uses
an 'int' for the signal number, unlike our version which uses an
'unsigned int'. Fix up the function to use an 'int'. This should not
affect the ABI.
2016-05-30 13:51:27 +00:00

110 lines
3.2 KiB
Groff

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.\" @(#)psignal.3 8.2 (Berkeley) 2/27/95
.\" $FreeBSD$
.\"
.Dd May 30, 2016
.Dt PSIGNAL 3
.Os
.Sh NAME
.Nm psignal ,
.Nm strsignal ,
.Nm sys_siglist ,
.Nm sys_signame
.Nd system signal messages
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In signal.h
.Ft void
.Fn psignal "int sig" "const char *s"
.Vt extern const char * const sys_siglist[] ;
.Vt extern const char * const sys_signame[] ;
.In string.h
.Ft "char *"
.Fn strsignal "int sig"
.Sh DESCRIPTION
The
.Fn psignal
and
.Fn strsignal
functions locate the descriptive message
string for a signal number.
.Pp
The
.Fn strsignal
function accepts a signal number argument
.Fa sig
and returns a pointer to the corresponding message string.
.Pp
The
.Fn psignal
function accepts a signal number argument
.Fa sig
and writes it to the standard error.
If the argument
.Fa s
is
.Pf non- Dv NULL
and does not point to the null character,
.Fa s
is written to the standard error file descriptor
prior to the message string,
immediately followed by a colon and a space.
If the signal number is not recognized
.Pq Xr sigaction 2 ,
the string
.Dq "Unknown signal"
is produced.
.Pp
The message strings can be accessed directly
through the external array
.Va sys_siglist ,
indexed by recognized signal numbers.
The external array
.Va sys_signame
is used similarly and
contains short, upper-case abbreviations for signals
which are useful for recognizing signal names
in user input.
The defined variable
.Dv NSIG
contains a count of the strings in
.Va sys_siglist
and
.Va sys_signame .
.Sh SEE ALSO
.Xr sigaction 2 ,
.Xr perror 3 ,
.Xr strerror 3
.Sh HISTORY
The
.Fn psignal
function appeared in
.Bx 4.2 .