Signed-off-by: Arkadiusz Drabczyk <arkadiusz@xxxxxxxxxxxx>
---
man3/fread.3 | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/man3/fread.3 b/man3/fread.3
index 2dd7be9..4af3850 100644
--- a/man3/fread.3
+++ b/man3/fread.3
@@ -113,6 +113,61 @@ T} Thread safety MT-Safe
.TE
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C89.
+.SH EXAMPLES
+The program below demonstrates the use of
+.BR fread ()
+by parsing /bin/sh ELF executable in binary mode and printing its
+magic and class:
+.PP
+.in +4n
+.EX
+$ \fB./a.out\fP
+./a.out
+ELF magic: 0x7f454c46
+Class: 0x02
+.EE
+.in
+.SS Program source
+\&
+.EX
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(void)
+{
+ FILE *fp = fopen("/bin/sh", "rb");
+ if (!fp) {
+ perror("fopen");
+ return EXIT_FAILURE;
+ }
+
+ unsigned char buffer[4];
+
+ size_t ret =
+ fread(buffer, sizeof(buffer) / sizeof(*buffer), sizeof(*buffer),
+ fp);
+ if (ret != sizeof(*buffer)) {
+ fprintf(stderr, "fread() failed: %zu\en", ret);
+ exit(EXIT_FAILURE);
+ }
+
+ printf("ELF magic: %#04x%02x%02x%02x\en", buffer[0], buffer[1],
+ buffer[2], buffer[3]);
+
+ ret = fread(buffer, 1, 1, fp);
+ if (ret != 1) {
+ fprintf(stderr, "fread() failed: %zu\en", ret);
+ exit(EXIT_FAILURE);
+ }
+
+ printf("Class: %#04x\en", buffer[0]);
+
+ fclose(fp);
+
+ exit(EXIT_SUCCESS);
+}
+.EE
.SH SEE ALSO
.BR read (2),
.BR write (2),
--
2.9.0
