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| author | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
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| committer | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
| commit | 78e51a8c6678b6e3dff3d619aa786669f531f4bc (patch) | |
| tree | 015e00fde4fc837fd31b705e18d17dc913829388 /man/man3/exits.html | |
| parent | 2634795b5f0053bc0ff08e5d7bbc0eda8efea061 (diff) | |
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diff --git a/man/man3/exits.html b/man/man3/exits.html new file mode 100644 index 00000000..cc94a468 --- /dev/null +++ b/man/man3/exits.html @@ -0,0 +1,126 @@ +<head> +<title>exits(3) - Plan 9 from User Space</title> +<meta content="text/html; charset=utf-8" http-equiv=Content-Type> +</head> +<body bgcolor=#ffffff> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=10><td> +<tr><td width=20><td> +<tr><td width=20><td><b>EXITS(3)</b><td align=right><b>EXITS(3)</b> +<tr><td width=20><td colspan=2> + <br> +<p><font size=+1><b>NAME </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + exits, _exits, atexit, atexitdont, terminate – terminate process, + process cleanup<br> + +</table> +<p><font size=+1><b>SYNOPSIS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>#include <u.h><br> + #include <libc.h> + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>void _exits(char *msg)<br> + void exits(char *msg)<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>int atexit(void(*)(void))<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>void atexitdont(void(*)(void))<br> + </font></tt> +</table> +<p><font size=+1><b>DESCRIPTION </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <i>Exits</i> is the conventional way to terminate a process. <i>_Exits</i> also + terminates a process but does not call the registered <i>atexit</i> handlers + (<i>q.v.</i>). They can never return. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Msg</i> conventionally includes a brief (maximum length <tt><font size=+1>ERRLEN</font></tt>) explanation + of the reason for exiting, or a null pointer or empty string to + indicate normal termination. The string is passed to the parent + process, prefixed by the name and process id of the exiting process, + when the parent does a <a href="../man3/wait.html"><i>wait</i>(3)</a>. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Before calling <i>_exits</i> with <i>msg</i> as an argument, <i>exits</i> calls in + reverse order all the functions recorded by <i>atexit</i>. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Atexit</i> records <i>fn</i> as a function to be called by <i>exits</i>. It returns + zero if it failed, nonzero otherwise. A typical use is to register + a cleanup routine for an I/O package. To simplify programs that + fork or share memory, <i>exits</i> only calls those <i>atexit</i>-registered + functions that were registered by the same process as that calling + <i>exits</i>. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Calling <i>atexit</i> twice (or more) with the same function argument + causes <i>exits</i> to invoke the function twice (or more). + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + There is a limit to the number of exit functions that will be + recorded; <i>atexit</i> returns 0 if that limit has been reached. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Atexitdont</i> cancels a previous registration of an exit function.<br> + +</table> +<p><font size=+1><b>SOURCE </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>/usr/local/plan9/src/lib9/atexit.c<br> + /usr/local/plan9/src/lib9/_exits.c<br> + </font></tt> +</table> +<p><font size=+1><b>SEE ALSO </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <a href="../man2/fork.html"><i>fork</i>(2)</a>, <a href="../man3/wait.html"><i>wait</i>(3)</a><br> + +</table> +<p><font size=+1><b>BUGS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Because of limitations of Unix, the exit status of a process can + only be an 8-bit integer. Exit status 0 is used for empty exit + messages, and 1 for non-empty messages. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Exit codes 97 through 99 are used by the thread library to signal + internal synchronization errors between the main program and a + proxy process that implements backgrounding. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + To avoid name conflicts with the underlying system, <i>atexit</i> and + <i>atexitdont</i> are preprocessor macros defined as <i>p9atexit</i> and <i>p9atexitdont</i>; + see <a href="../man3/intro.html"><i>intro</i>(3)</a>.<br> + +</table> + +<td width=20> +<tr height=20><td> +</table> +<!-- TRAILER --> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=15><td width=10><td><td width=10> +<tr><td><td> +<center> +<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> +</center> +</table> +<!-- TRAILER --> +</body></html> |