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Use pread to implement pread, rather than taking a detour throug stdio.

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PR:		52190
Submitted by:	Dan Nelson <dnelson@allantgroup.com>
This commit is contained in:
David Malone 2004-03-23 12:29:17 +00:00
parent 5214320f76
commit b637237cba
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=127331
1 changed files with 2 additions and 16 deletions
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18
usr.bin/truss/syscalls.c
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@ -169,23 +169,9 @@ get_syscall(const char *name) {
static int
get_struct(int procfd, void *offset, void *buf, int len) {
char *pos;
FILE *p;
int c, fd;
if ((fd = dup(procfd)) == -1)
err(1, "dup");
if ((p = fdopen(fd, "r")) == NULL)
err(1, "fdopen");
if (fseeko(p, (uintptr_t)offset, SEEK_SET) == 0) {
for (pos = (char *)buf; len--; pos++) {
if ((c = fgetc(p)) == EOF)
return (-1);
*pos = c;
}
} else
bzero(buf, len);
fclose(p);
if (pread(procfd, buf, len, (uintptr_t)offset) != len)
return -1;
return 0;
}