diff options
Diffstat (limited to 'man3/setjmp.3')
| -rw-r--r-- | man3/setjmp.3 | 35 |
1 files changed, 17 insertions, 18 deletions
diff --git a/man3/setjmp.3 b/man3/setjmp.3 index 5133f89..18771aa 100644 --- a/man3/setjmp.3 +++ b/man3/setjmp.3 @@ -3,7 +3,7 @@ .\" .\" SPDX-License-Identifier: GPL-2.0-or-later .\" -.TH setjmp 3 2023-07-20 "Linux man-pages 6.05.01" +.TH setjmp 3 2023-10-31 "Linux man-pages 6.7" .SH NAME setjmp, sigsetjmp, longjmp, siglongjmp \- performing a nonlocal goto .SH LIBRARY @@ -12,22 +12,22 @@ Standard C library .SH SYNOPSIS .nf .B #include <setjmp.h> -.PP +.P .BI "int setjmp(jmp_buf " env ); .BI "int sigsetjmp(sigjmp_buf " env ", int " savesigs ); -.PP +.P .BI "[[noreturn]] void longjmp(jmp_buf " env ", int " val ); .BI "[[noreturn]] void siglongjmp(sigjmp_buf " env ", int " val ); .fi -.PP +.P .RS -4 Feature Test Macro Requirements for glibc (see .BR feature_test_macros (7)): .RE -.PP +.P .BR setjmp (): see NOTES. -.PP +.P .BR sigsetjmp (): .nf _POSIX_C_SOURCE @@ -42,7 +42,7 @@ function dynamically establishes the target to which control will later be transferred, and .BR longjmp () performs the transfer of execution. -.PP +.P The .BR setjmp () function saves various information about the calling environment @@ -55,7 +55,7 @@ for later use by In this case, .BR setjmp () returns 0. -.PP +.P The .BR longjmp () function uses the information saved in @@ -70,7 +70,7 @@ the values of some other registers and the process signal mask may be restored to their state at the time of the .BR setjmp () call. -.PP +.P Following a successful .BR longjmp (), execution continues as if @@ -89,7 +89,7 @@ and .BR siglongjmp () also perform nonlocal gotos, but provide predictable handling of the process signal mask. -.PP +.P If, and only if, the .I savesigs argument provided to @@ -112,7 +112,7 @@ or the nonzero value specified in .I val is returned. -.PP +.P The .BR longjmp () or @@ -139,7 +139,6 @@ T{ .BR siglongjmp () T} Thread safety MT-Safe .TE -.sp 1 .SH STANDARDS .TP .BR setjmp () @@ -162,7 +161,7 @@ POSIX.1-2001, C89. .TQ .BR siglongjmp () POSIX.1-2001. -.PP +.P POSIX does not specify whether .BR setjmp () will save the signal mask @@ -239,7 +238,7 @@ and .IP \[bu] they are not declared as .IR volatile . -.PP +.P Analogous remarks apply for .BR siglongjmp (). .\" @@ -263,13 +262,13 @@ call. call should employ a unique .I jmp_buf variable.) -.PP +.P Adding further difficulty, the .BR setjmp () and .BR longjmp () calls may not even be in the same source code module. -.PP +.P In summary, nonlocal gotos can make programs harder to understand and maintain, and an alternative should be used if possible. .\" @@ -280,7 +279,7 @@ returns before .BR longjmp () is called, the behavior is undefined. Some kind of subtle or unsubtle chaos is sure to result. -.PP +.P If, in a multithreaded program, a .BR longjmp () call employs an @@ -298,7 +297,7 @@ in a different thread, the behavior is undefined. .\" (i.e., from a handler that was invoked in response to a signal that was .\" generated while another signal was already in the process of being .\" handled), the behavior is undefined. -.PP +.P POSIX.1-2008 Technical Corrigendum 2 adds .\" http://austingroupbugs.net/view.php?id=516#c1195 .BR longjmp () |