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Handle errors using a custom handle_errror() macro.

This commit is contained in:
Michael Kerrisk 2007-11-19 03:34:00 +00:00
parent 6a578b8823
commit 4407d3d81e
2 changed files with 22 additions and 27 deletions
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27
man2/mmap.2
View File

@ -513,6 +513,9 @@ to output the desired bytes.
#include <stdlib.h>
#include <unistd.h>
#define handle_error(msg) \\
do { perror(msg); exit(EXIT_FAILURE); } while (0)
int
main(int argc, char *argv[])
{
@ -529,15 +532,11 @@ main(int argc, char *argv[])
}
fd = open(argv[1], O_RDONLY);
if (fd == \-1) {
perror("open");
exit(EXIT_FAILURE);
}
if (fd == \-1)
handle_error("open");
if (fstat(fd, &sb) == \-1) { /* To obtain file size */
perror("fstat");
exit(EXIT_FAILURE);
}
if (fstat(fd, &sb) == \-1) /* To obtain file size */
handle_error("fstat");
offset = atoi(argv[2]);
pa_offset = offset & ~(sysconf(_SC_PAGE_SIZE) \- 1);
@ -560,17 +559,15 @@ main(int argc, char *argv[])
addr = mmap(NULL, length + offset \- pa_offset, PROT_READ,
MAP_PRIVATE, fd, pa_offset);
if (addr == MAP_FAILED) {
perror("mmap");
exit(EXIT_FAILURE);
}
if (addr == MAP_FAILED)
handle_error("mmap");
s = write(STDOUT_FILENO, addr + offset \- pa_offset, length);
if (s != length) {
if (s == \-1)
perror("write");
else
fprintf(stderr, "partial write");
handle_error("write");
fprintf(stderr, "partial write");
exit(EXIT_FAILURE);
}

22
man3/sem_wait.3
View File

@ -191,6 +191,9 @@ The source code of the program is as follows:
sem_t sem;
#define handle_error(msg) \\
do { perror(msg); exit(EXIT_FAILURE); } while (0)
static void
handler(int sig)
{
@ -214,30 +217,25 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
if (sem_init(&sem, 0, 0) == \-1) {
perror("sem_init");
exit(EXIT_FAILURE);
}
if (sem_init(&sem, 0, 0) == \-1)
handle_error("sem_init");
/* Establish SIGALRM handler; set alarm timer using argv[1] */
sa.sa_handler = handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (sigaction(SIGALRM, &sa, NULL) == \-1) {
perror("sigaction");
exit(EXIT_FAILURE);
}
if (sigaction(SIGALRM, &sa, NULL) == \-1)
handle_error("sigaction");
alarm(atoi(argv[1]));
/* Calculate relative interval as current time plus
number of seconds given argv[2] */
if (clock_gettime(CLOCK_REALTIME, &ts) == \-1) {
perror("clock_gettime");
exit(EXIT_FAILURE);
}
if (clock_gettime(CLOCK_REALTIME, &ts) == \-1)
handle_error("clock_gettime");
ts.tv_sec += atoi(argv[2]);
printf("main() about to call sem_timedwait()\\n");