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Remove non-working special case for pipe(2) from amd64-fbsd32.c and

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i386-fbsd.c. Add pipe(2) to syscall table to decode it's pointer
argument properly and re-add special handling for pipe(2) return value
to print_syscall_ret().

PR:		bin/120870
Approved by:	trasz (mentor)
This commit is contained in:
Jaakko Heinonen 2009-12-21 17:38:13 +00:00
parent fcdb43ba01
commit c059fa2e24
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=200780
3 changed files with 8 additions and 26 deletions
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13
usr.bin/truss/amd64-fbsd32.c
View File

@ -315,19 +315,6 @@ amd64_fbsd32_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
}
}
/*
* The pipe syscall returns its fds in two registers and has assembly glue
* to provide the libc API, so it cannot be handled like regular syscalls.
* The nargs check is so we don't have to do yet another strcmp on every
* syscall.
*/
if (!errorp && fsc.nargs == 0 && fsc.name && strcmp(fsc.name, "pipe") == 0) {
fsc.nargs = 1;
fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
asprintf(&fsc.s_args[0], "[%d,%d]", (int)retval, (int)regs.r_rdx);
retval = 0;
}
if (fsc.name != NULL &&
(!strcmp(fsc.name, "freebsd32_execve") || !strcmp(fsc.name, "exit"))) {
trussinfo->curthread->in_syscall = 1;

13
usr.bin/truss/i386-fbsd.c
View File

@ -305,19 +305,6 @@ i386_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
}
}
/*
* The pipe syscall returns its fds in two registers and has assembly glue
* to provide the libc API, so it cannot be handled like regular syscalls.
* The nargs check is so we don't have to do yet another strcmp on every
* syscall.
*/
if (!errorp && fsc.nargs == 0 && fsc.name && strcmp(fsc.name, "pipe") == 0) {
fsc.nargs = 1;
fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
asprintf(&fsc.s_args[0], "[%d,%d]", (int)retval, regs.r_edx);
retval = 0;
}
if (fsc.name != NULL &&
(!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
trussinfo->curthread->in_syscall = 1;

8
usr.bin/truss/syscalls.c
View File

@ -242,6 +242,8 @@ struct syscall syscalls[] = {
.args = { { Name | IN, 0 }, { Hex, 1 } } },
{ .name = "pathconf", .ret_type = 1, .nargs = 2,
.args = { { Name | IN, 0 }, { Pathconf, 1 } } },
{ .name = "pipe", .ret_type = 1, .nargs = 1,
.args = { { Ptr, 0 } } },
{ .name = "truncate", .ret_type = 1, .nargs = 3,
.args = { { Name | IN, 0 }, { Int | IN, 1 }, { Quad | IN, 2 } } },
{ .name = "ftruncate", .ret_type = 1, .nargs = 3,
@ -1137,6 +1139,12 @@ print_syscall_ret(struct trussinfo *trussinfo, const char *name, int nargs,
if (errorp) {
fprintf(trussinfo->outfile, " ERR#%ld '%s'\n", retval, strerror(retval));
} else {
/*
* Because pipe(2) has a special assembly glue to provide the
* libc API, we have to adjust retval.
*/
if (name != NULL && !strcmp(name, "pipe"))
retval = 0;
fprintf(trussinfo->outfile, " = %ld (0x%lx)\n", retval, retval);
}
}