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add exticode

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rsc 2006-02-14 19:39:30 +00:00
parent a79e8ab44d
commit 3449b18918
1 changed files with 17 additions and 3 deletions
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20
man/man3/exits.3
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@ -1,6 +1,6 @@
.TH EXITS 3 .TH EXITS 3
.SH NAME .SH NAME
exits, _exits, atexit, atexitdont, terminate \- terminate process, process cleanup exits, _exits, exitcode, atexit, atexitdont \- terminate process, process cleanup
.SH SYNOPSIS .SH SYNOPSIS
.B #include <u.h> .B #include <u.h>
.br .br
@ -13,6 +13,9 @@ void _exits(char *msg)
void exits(char *msg) void exits(char *msg)
.PP .PP
.B .B
int exitcode(char *msg)
.PP
.B
int atexit(void(*)(void)) int atexit(void(*)(void))
.PP .PP
.B .B
@ -87,8 +90,19 @@ cancels a previous registration of an exit function.
.SH BUGS .SH BUGS
Because of limitations of Unix, the exit status of a Because of limitations of Unix, the exit status of a
process can only be an 8-bit integer. process can only be an 8-bit integer.
Exit status 0 is used for empty exit messages, and 1 for .I Exits
non-empty messages. and
.I _exits
treat null or empty exit status as exit code 0
and call
.I exitcode
to translate any other string into an exit code.
By default, the library provides an
.I exitcode
that maps all messages to 1.
Applications may find it useful to provide their own
implementations of
.I exitcode .
.PP .PP
Exit codes 97 through 99 are used by the thread library to signal Exit codes 97 through 99 are used by the thread library to signal
internal synchronization errors between the main program internal synchronization errors between the main program