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| author | Alejandro Colomar <alx@kernel.org> | 2025-08-19 17:48:50 +0200 |
|---|---|---|
| committer | Alejandro Colomar <alx@kernel.org> | 2025-08-20 18:14:03 +0200 |
| commit | 0e7a39804a3c017a209117fc2243c6cbb543dede (patch) | |
| tree | 91e0b287d8b826d668c3d8118347f07cc8b8964a /man/man2/mprotect.2 | |
| parent | e2d3f14fe40ad90a1fedf0fcd27e6cc896c49a7a (diff) | |
| download | man-pages-0e7a39804a3c.tar.gz | |
man/: EXAMPLES: Use err(3) and errc(3bsd) instead of similar macros
These functions are quite portable. And if one doesn't have them for
some reason (but libbsd has been ported to many systems), one can write
them easily as macros, anyway.
Signed-off-by: Alejandro Colomar <alx@kernel.org>
Diffstat (limited to 'man/man2/mprotect.2')
| -rw-r--r-- | man/man2/mprotect.2 | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/man/man2/mprotect.2 b/man/man2/mprotect.2 index 773d93dc9c..269ae204d6 100644 --- a/man/man2/mprotect.2 +++ b/man/man2/mprotect.2 @@ -293,6 +293,7 @@ Got SIGSEGV at address: 0x804e000 \& .\" SRC BEGIN (mprotect.c) .EX +#include <err.h> #include <malloc.h> #include <signal.h> #include <stdio.h> @@ -300,9 +301,6 @@ Got SIGSEGV at address: 0x804e000 #include <sys/mman.h> #include <unistd.h> \& -#define handle_error(msg) \[rs] - do { perror(msg); exit(EXIT_FAILURE); } while (0) -\& static char *buffer; \& static void @@ -328,24 +326,24 @@ main(void) sigemptyset(&sa.sa_mask); sa.sa_sigaction = handler; if (sigaction(SIGSEGV, &sa, NULL) == \-1) - handle_error("sigaction"); + err(EXIT_FAILURE, "sigaction"); \& pagesize = sysconf(_SC_PAGE_SIZE); if (pagesize == \-1) - handle_error("sysconf"); + err(EXIT_FAILURE, "sysconf"); \& /* Allocate a buffer aligned on a page boundary; initial protection is PROT_READ | PROT_WRITE. */ \& buffer = memalign(pagesize, 4 * pagesize); if (buffer == NULL) - handle_error("memalign"); + err(EXIT_FAILURE, "memalign"); \& printf("Start of region: %p\[rs]n", buffer); \& if (mprotect(buffer + pagesize * 2, pagesize, PROT_READ) == \-1) - handle_error("mprotect"); + err(EXIT_FAILURE, "mprotect"); \& for (char *p = buffer ; ; ) *(p++) = \[aq]a\[aq]; |