diff options
Diffstat (limited to '')
| -rw-r--r-- | man3/alloca.3 | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/man3/alloca.3 b/man3/alloca.3 index 6bf1791..7fa61bc 100644 --- a/man3/alloca.3 +++ b/man3/alloca.3 @@ -13,7 +13,7 @@ .\" Various rewrites and additions (notes on longjmp() and SIGSEGV). .\" Weaken warning against use of alloca() (as per Debian bug 461100). .\" -.TH alloca 3 2023-07-20 "Linux man-pages 6.05.01" +.TH alloca 3 2023-10-31 "Linux man-pages 6.7" .SH NAME alloca \- allocate memory that is automatically freed .SH LIBRARY @@ -22,7 +22,7 @@ Standard C library .SH SYNOPSIS .nf .B #include <alloca.h> -.PP +.P .BI "void *alloca(size_t " size ); .fi .SH DESCRIPTION @@ -54,7 +54,6 @@ T{ .BR alloca () T} Thread safety MT-Safe .TE -.sp 1 .SH STANDARDS None. .SH HISTORY @@ -73,7 +72,7 @@ it can also simplify memory deallocation in applications that use or .BR siglongjmp (3). Otherwise, its use is discouraged. -.PP +.P Because the space allocated by .BR alloca () is allocated within the stack frame, @@ -82,19 +81,19 @@ is jumped over by a call to .BR longjmp (3) or .BR siglongjmp (3). -.PP +.P The space allocated by .BR alloca () is .I not automatically deallocated if the pointer that refers to it simply goes out of scope. -.PP +.P Do not attempt to .BR free (3) space allocated by .BR alloca ()! -.PP +.P By necessity, .BR alloca () is a compiler built-in, also known as @@ -107,12 +106,12 @@ into the built-in, but this is forbidden if standards conformance is requested in which case .I <alloca.h> is required, lest a symbol dependency be emitted. -.PP +.P The fact that .BR alloca () is a built-in means it is impossible to take its address or to change its behavior by linking with a different library. -.PP +.P Variable length arrays (VLAs) are part of the C99 standard, optional since C11, and can be used for a similar purpose. However, they do not port to standard C++, and, being variables, @@ -125,7 +124,7 @@ would overflow the space available, and, hence, neither is indicating an error. (However, the program is likely to receive a .B SIGSEGV signal if it attempts to access unavailable space.) -.PP +.P On many systems .BR alloca () cannot be used inside the list of arguments of a function call, because |